The following are the correct statements : . The pressure in the container will be 42.1 mm Hg.
The vapor pressure is the measurement of the tendency of the substance to change in to the gaseous or the vapor state. The vapor pressure of liquid ethyl amine, C₂H₅NH₂, is 40.0 mm Hg at 233 K.A sample of C₂H₅NH₂ is placed in a closed, evacuated container of constant volume at a temperature of 349 K. It is found that all of the C₂H₅NH₂ is in the vapor phase and that the pressure is 63.0 mm Hg. If the temperature in the container is reduced to 233 K.
P1 = 63 mmHg T1 = 349 K
P2 = ? T2 = 233 K
P1 / T1 = P2 / T2
P2 = P1 T2 / T1
P2 = ( 63 × 233 ) / 349
P2 = 42 mmHg
Then , The pressure in the container will be 42.1 mm Hg
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how many signals would you expect to find in the 13c nmr spectrum of the following compound? 6 7 8 9 10
In the compound's 13c nmr spectrum, there should be six signals. Despite there being four carbon atoms, there are only three distinct habitats for the carbons in the spectrum, which has a total of three peaks.
The carbon skeleton itself, not simply the proton linked to it, is the subject of the 13C NMR. The quantity of signals indicates the number of distinct carbons or sets of comparable carbons. b. Signal splitting reveals how many hydrogen atoms are bonded to each carbon. Due to sp2 hybridization and the double bond to oxygen, the 13C-NMR signals for carbonyl carbons are often the deepest downfield (170–220 ppm).
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Which of these is NOT correct?1. Kinases are enzymes that phosphorylate other molecules.2. Cyclic AMP binds to calmodulin.3. Ion channels are found on both the plasma membrane and the endoplasmic reticulum.4. Tyrosine-kinase receptors consist of two polypeptides that join when activated by a signal molecule.5. Phospholipase C catalyzes the formation of IP3.
False: Cyclic AMP binds to calmodulin Calcium binds to calmodulin is the appropriate response.
This protein-protein interaction ultimately has a physiological consequence; for instance, in smooth muscle, Ca2+ binding to calmodulin causes it to connect with and activate myosin light chain kinase, which in turn catalyses the phosphorylation of myosin. The smooth muscle contracts as a result of this reaction.
The protein calmodulin interacts with calcium ions as they enter a cell. Four calcium sites are present in this protein, and when three or four of these sites are occupied by calcium, the calmodulin changes form and starts a number of internal cell processes, such as the activation or inhibition of protein kinases.
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How do you do number thirty?
buna s. the americans, who improved upon its manufacturing with the copolymerization of butadiene and styrene, gave it the name gr-s (government rubber-styrene) throughout the duration of the war. this copolymer, later known as sbr, quickly rose to prominence as the most significant synthetic rubber, accounting for nearly half of global output
Buna-S is a synthetic rubber. The monomers that are used for it is butadiene and styrene. It is generally used for making automobiles tyres, floor tiles, footwear components etc.
Any artificial elastomer is generally referred to as synthetic rubber. Synthetic rubber is usually derived from the additional polymers of polyene monomers and, unless the synthetic rubber is disclosed as a polysulfide rubber, laminates that is usually containing such a layer will be classified with additional polymers.
Synthetic rubber is any man-made elastomer. They're polymers made from petroleum byproducts. Synthetic rubber, like natural rubber, has several applications in the automobile sector, which is generally including tyres, door and window profiles, seals such as O-rings and gaskets, hoses, belts, matting, and flooring.
Buna-S is a polymer.
Its name derives Bu stands for butadiene and Na stands for sodium and S stands for Styrene.
It is formed by the copolymerization of butadiene and styrene.
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which of the following statements is true? which of the following statements is true? intermolecular forces are generally stronger than bonding forces. increasing the pressure on a solid usually causes it to become a liquid. the potential energy of molecules decrease as they get closer to one another. energy is given off when the attraction between two molecules is broken. none of the above are true.
The correct answer is b). The potential energy of molecules decreases as they get closer to one another.
This is true because molecules are attracted to one another by intermolecular forces, which are weaker than chemical bonds. As molecules come closer together, the intermolecular forces increase in strength, and this increase in strength is greater than the decrease in potential energy.
Therefore, the total potential energy of the molecules decreases as they get closer together. This is in contrast to a and d, which are false. Increasing pressure on a solid does not usually cause it to become a liquid, and intermolecular forces are generally weaker than bonding forces.
In c, energy is not given off when the attraction between two molecules is broken, but instead when bonds are broken.
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Which of the following wavenumber corresponds to the carbon/carbon triple bond region on an IR spectrum? 500 4000 cm 400-4000 cm1 400 1500 cm1 2100 2300 cm1 1600 - 1850 cm1
The wavenumber that corresponds to the carbon/carbon triple bond area on an IR spectra is 2100–2300 cm–1.
Alkynes in IR Spectroscopy Training Alkynes are substances with a triple bond between carbon atoms (-CC-). Between 2260 and 2100 cm-1, a faint band represents the -CC stretch. Due to the rarity of organic substances that exhibit an absorption in this area, this can be a crucial diagnostic tool. In compounds known as alkenes or alkynes, carbon atoms can also form double or triple bonds. An sp 2-hybridized orbital and a p-orbital that wasn't engaged in the hybridization combine to produce a double bond. An sp-hybridized orbital and two p-orbitals from each atom combine to form a triple bond.
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From the same 44,000 liters of water used to discover Rubidium Chloride, Busen extracted 17 g of Cesium Chloride (MW=168.36). what was the original concentration (in micromolar) of Cesium chloride? ______ micromolar
Radiation therapy uses the radioactive isotope of the alkali metal cesium (Cesium 137). A non-radioactive salt called cadmium chloride is marketed as an alternative cancer treatment. It is based on discoveries that cancer cells have an affinity for cesium ions and is also known as "high pH therapy" (1).
What is the cesium chloride chemical formula?
The inorganic compound with the chemical formula CsCl is known as calcium chloride or cesium chloride. In a variety of specialized applications, this colorless salt serves as a significant supply of caesium ions. Each caesium ion in its crystal structure constitutes a primary structural type that is coordinated by 8 chloride ions.
Is CsCl an electrical conductor?
For usage compatible with chlorides, cesium chloride is a great supply of crystalline cesium that is water soluble. When combined or dissolved in water, chloride compounds can conduct electricity when fused.
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The diagrams above represent two allotropes of solid phosphorus. Which of the following correctly identifies the allotrope with the higher melting point and explains why?
Allotrope I, because it has P4 molecules with covalent bonds that are stronger than dispersion forces between individual P atoms in allotrope II.
Allotrope II, because it has covalent bonds between the phosphorous atoms that are stronger than the dispersion forces between the P4 molecules in allotrope I.
Allotrope II, because it has metallic bonding that is stronger than the covalent bonding found in the P4 molecules in allotrope I.
Both allotropes have the same melting point because they both contain phosphorous atom
Allotrope 1 because it lacks the covalent bonds that are present in allotrope 2 between the phosphorus atoms. Allotrope 1 because it lacks the covalent bonds that are present in allotrope 2 between the phosphorus atoms.
Phosphorus exists in nature in a variety of allotropic forms. White phosphorus, black phosphorus, and red phosphorus are the three most significant allotropic forms of phosphorus. Study about the phosphorus allotropic forms and their characteristics.
Different forms of the element with variations in its molecular structure and organization are known as allotropes of solid phosphorus. Due to the lack of covalent connections between the phosphorus atoms in allotrope 1, it is more stable than allotrope 2 and has
higher melting point.
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the pulley shown below is massless and frictionless. if the system is released from rest from the position shown, which of the following statements are true (more than one answer can be correct). since block b is larger and heavier than block a, the pulley will rotate clockwise.
A massless string crosses a frictionless pulley while carrying two masses at its ends: m and me (m;> m.
What exactly does it mean when a pulley has no friction?When we say a pulley is frictionless, we mean that there is little to no friction in its bearings, which allows the pulley to rotate freely and without encountering any resistance. We don't want to imply that there is little to no friction between the string and the surface of the pulley.
How can the tension be determined in a frictionless pulley system?The following equations are used to determine the tension T = M x A. If you are attempting to determine T in a simple pulley system with a mass of 9g and an upward acceleration of 2m/s2, then T = 9g x 2m/s2 = 18gm/s2
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1. The standard enthalpy of formation values, standard entropy values, and the standard free energy of formation values are listed in Appendix C, and other Thermodynamic tables.
Which of the following is not a requirement for standard state conditions. (Be sure not to confuse standard state conditions with STP conditions used for gas phase systems.)
A) Gases: 1 atm pressure
B) Solutions: 1 M concentration
C) Solid: Pure
D) Liquid: Pure
E)
Temperature: 273 K
The following is not a requirement for standard state conditions: Gases: 1 atm pressure ,Liquid: Pure ,Temperature: 273 K.
The standard state of a substance (pure substance, mixture or solution) is the reference point for calculating properties under various conditions. A superscripted circle ° (degree symbol) or the Plimsoll symbol (⦵) is used to denote thermodynamic quantities in the standard state. B. Enthalpy change (ΔH°), entropy change (ΔS°), or Gibbs free energy change (ΔG°) [1][2]. The standard recommends plimsoll, but the degree symbol is widely used.
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what is the ratio of the volume occupied before the reaction to that following the reaction? enter your answer in the form of a decimal number.
the ratio of the volume occupied before the reaction to that following the reaction is 0.5.
the ratio of volume is calculated by v1/v2 where v1=n1=4 and v2=n2=8, hence 4/8=1/2=0.5.The percentage of gases which react to create a product is regarded to as the volume ratio. Consider the following aspects nitrogen and oxygen. As seen in the balanced chemical equation below, when these gases react, nitrogen dioxide is formed. Based on Avogadro's molar volume hypothesis, we can calculate the volume equivalents of the moles. The law of Avogadro. According to Avogadro's law, the volume occupied by one gram-mole of gas is approximately 22.4 litres (0.791 cubic foot) at standard temperature and pressure (0 °C, 1 atmosphere). Avogadro's gas law is expressed as V/n = k, where V is volume, n is the number of gas particles, and k is a constant. V1/n1 = V2/n2 is another way to express Avogadro's gas law.
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The complete question is :
VISUALIZATION Avogadro's Law 8 + 8 Molecules 4 Molecules,what is the ratio of the volume occupied before the reaction to that following the reaction? enter your answer in the form of a decimal number.
for each reaction, consider whether a reaction will move in the forward (right) or reverse (left) direction? select the arrow that best indicates the acid-base equilibrium position.
A forward reaction is a reaction in which the products are produced from reactants and it goes from left to right in a reversible reaction.
Chemical equilibrium is the state in which both reactants and products are present in the concentrations which have no further tendency to change with time. A forward reaction is a reaction in which products are usually produced from reactants and it goes from left to right in a reversible reaction.
A backward reaction is a reaction in which reactants are produced from products and it goes from right to left in a reversible reaction. Chemical equilibrium is achieved when the rate of the forward reaction is generally equal to the rate of the backward reaction.
For a reversible reaction, one is the forward reaction and the other is generally considered as the backward reaction. The forward reactions usually favour the formation of products and the backward reaction favours the formation of reactants.
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an unknown gas x effuses 1.65 times faster than propane (c3h8). what is the molar mass of gas x? (round to nearest whole number; omit units). [blank] g/mol
The molar mass of unknown gas is - 16 g/mole
To calculate the rate of diffusion of gas is , we use Graham's law.
This law states that the rate of diffusion is inversely proportional to the square root of of the molar mass of the gas. The equation of the law is :
Rate of diffusion [tex]\alpha[/tex] [tex]\frac{1}{ \sqrt{ Molar mass of the gas} }[/tex]
Given that,
[tex]Rate_{unknown gas}[/tex] = 1.65 ×[tex]Rate_{C_{3}H_{8} }[/tex]
we know that,
Molar mass of the propane = 44 g/mole
Take the ratio of rate of diffusion of gases, we get:
[tex]\frac{Rate_{( unknown gas)} }{Rate_{C_{3} H_{8} } }[/tex] = [tex]\sqrt{} \frac{MC_{3}H _{8} }{ M_{(unknown gas)} }[/tex]
Putting values in above equation, we get:
[tex]\frac{1.65 * Rate_{C_{3} H_{8} } }{ Rate_{C_{3} H_{8} }}[/tex] = [tex]\sqrt{\frac{44}{ M_{(unknown gas} } }[/tex]
⇒ 1.65 = [tex]\sqrt{\frac{44}{M_{(unknown gas} } } }[/tex]
⇒ [tex]1.65^{2}[/tex] = [tex]\frac{44}{M_{(unknown gas)} }[/tex]
⇒ [tex]M_{(unknown gas)}[/tex] = [tex]\frac{44}{2.7225}[/tex]
⇒ [tex]M_{(unknown gas)}[/tex] = 16.1616
[tex]M_{(unknown gas)}[/tex] = 16
Hence, the molar mass of unknown gas is - 16 g/mole.
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Use the van der Waals equation to calculate the volume of 1.055 mol of neon at a pressure of 460.0 atm and a temperature of 375.0 K. (Use a = 0.211 L² .atm/mol? and b = 0.0171 L/mol for the van der Waals constants.) (Hint: One way to solve the van der Waals equation for V is to use successive approximations. Use the ideal gas law to get a preliminary estimate for V.) Express your answer in liters to three significant figures.V = ___ L
The volume of 1.055 mol of neon at a pressure of 460.0 atm and a temperature of 375.0 K is 0.046 L
What is the van der Waals equation?
The relationship between pressure, volume, temperature, and amount of actual gases is described by the Van der Waals equation. The equation for a real gas with 'n' moles is expressed as;
(P + an²/V²)(V - nb) = nRT
The formula can also be expressed as follows: Cube power of volume:
V = nRT/(P + an²/V²) -nb
Given that: a = 0.211 L² .atm/mol, b = 0.0171 L/mol, P = 460.0 atm T = 375.0 K, n = 1.055
Now from ideal gas equation V = nRT/P we get:
V = (1.055×0.082×375)/460.0 L
= 0.0705 L
Now from the van der Waals equation:
V = (1.055×0.082×375)/(460.0 + 0.211×1.055²/0.0705²) - (1.055×0.0171)
= 0.046 L
Hence, volume of the gas is 0.046 L.
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Arrange the following from lowest to highest entropy: NO(g) , NO2(g), N2O4(g) , N2 (g) . Assume 1 mole of each at the same conditions.
Values of entropy, from lowest to greatest
N2 = 191.6, NO = 210.8, NO2 = 240.0, N2O4 = 304.4, N2 is the lowest and N2O4 is the greatest entropy values.
Entropy, broadly speaking, serves as a metric for energy quality, with lower entropy indicating higher quality. Entropy is lower for energy that has been carefully organised (the efficient library). The random-pile library is a chaotic energy storage system with high entropy.
In other terms, entropy is the growth in disorder inside a system. It is described as the measurement of degree of unpredictability.
Greek words en- = in + trope = a turning were combined to form the word entropy by German physicist Rudolf Clausius in 1865 [Cl] (point). The name has an energy analogue, and etymologists think it was intended to signify the type of energy that all energy eventually and inevitably transforms into: wasteful heat.
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Which of the following represents an element in its most stable form at standard state? (Select all that apply.] O N (g) O C (diamond) O CO2 (g) O I2 (s) O Ge (s) O Pt (s) O O2 (g) O Na+ (s)
Element in its most stable form at standard state:
CO2(g) , I2(s) , Pt(s) , O2(g)
The maximum number of electrons that can be accommodated in the last shell or orbital is called a stable element. In the case of helium, the helium atom has only one shell. The maximum number of electrons that can be accommodated in the first shell is two. Therefore, the helium "two-electron" pattern system is stable. Most stable elements have an "octet electron configuration". Other examples are Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn). These elements are chemically stable elements, so they usually do not react chemically. Floating objects that are denser than water, such as razor blades and insects, float on the surface of the water without being partially submerged.
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CO(g) + 2 H2(g) <--> CH3OH(g)DH < 0The synthesis of CH3OH(g) from CO(g) and H2(g) is represented by the equation above. The value of Kc for the reaction at 483 K is 14.5.Which of the following explains the effect on the equilibrium constant, Kc , when the temperature of the reaction system is increased to 650 K?
According to how long it takes the block n to reach equilibrium, sort the scenarios. 26 is the equilibrium constant.
First, use an ICE table to write the balanced chemical equation.
2H2(g) + CO(g) = CH3OH (g)
I/mol/L: 0.500, 0.100, and 0 C/mol/L: -2, -2, and + x
E/mol L-1: 0.5 - x; 0. 0 - 2 x; x
[CO] = 0.15 mol/L = (0.500 - x) mol/L at equilibrium.
So \sx \s = 0.500 – 0.15 = 0.35Consequently, [ H 2 ] = (0.100 - 2 x) mol/L equals (0.100 - 0.25 mol/L) mol/L equals 0.30 mol/L
and
[CH 3 OH ] = 0.35 mol/L for x mol/L of CH 3 OH.
K \seq \s= \s[ \SCH \s3 \SOH \s]
[ \SCO \s]
[ \SH \s2 \s]
2 \s= \s0.35 \s0.15 \s× \s0.30 \s2 \s = 26
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A team at a university in Pennsylvania has concerns about the health of streams in a watershed because of the various land uses in the area. There has been an increase in road repair work, and the area has many dairy farms. Which of the following would be most effective at preventing sediment runoff into the streams of the watershed?
A team at a university in Pennsylvania has concerns about the health of streams in a watershed because of the various land uses in the area. Maintain zones of grass at least 100m wide on the sides of streams in the area would be most effective at preventing sediment runoff into the streams of the watershed
watershed is a piece of land which drains or "sheds" water into a particular body of water. A watershed exists for every body of water. Rainfall and snowmelt are channelled into rivers and streams by watersheds. These relatively small bodies of water drain into larger bodies of water, such as lakes, bays, and seas. Stream water is also obtained from permeates and artesian wells where groundwater discharges to the land surface from aquifers. As this water collects and flows downslope, it concentrates in low areas, forming small stream channels. These small streams are known as a watershed's headwaters
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if the solute is less volatile than water, explain what will happen to the volumes in the two containers as time passes.
After a while, the volume of water will shrink and the volume of the aqueous solution will grow.
What exactly does the word "solute" mean?Solute refers to an object that dissolves in a solution. In fluid solutions, there is a larger concentration of solvent than solute. Salt and water are two excellent examples of substances that we use on a daily basis. Since salt dissolves in water, it serves as the solute.
Water: a solute or not?Solute is the name for the substance that dissolves in the solvent. Solute concentration is lower than solvent concentration. One instance of a mixture where salt serves as the solute and water as the solvent is salt and water.
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the conversion of succinate to oxaloacetate during krebs cycle involves reduction, dehydration, reduction oxidation, hydration, oxidation oxidation, dehydration, oxidation reduction, hydration, reduction
During the Krebs cycle, succinate is converted to oxaloacetate through oxidation, hydration, and oxidation.
There were three processes involved in converting succinate to oxaloacetate. First, fumarate is produced by oxidising succinate. Oxidation is the result of the removal of hydrogen from succinate. These hydrogen are taken up by FAD, resulting in FADH2.
Hydration then follows. Malate is created by combining fumarate with water.
Malate is then subjected to oxidation by loosing hydrogen, which NAD takes up. Oxaloacetate is created when malate undergoes oxidation.
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The indicator in a titration changed color after 0.005 mol of calcium hydroxide were added to to a sulfuric acid solution for the chemical reaction shown below.
How much sulfuric acid was in solution?
H2SO4+Ca(OH)2 > CaSO4+2H2O
0.005 mol
0.1 mol
0.105 mol
I need more information to answer this question.
According to the equation, the solution must be neutralized using 1 mole of Ca(OH)₂ per each 1 mole of H₂SO₄. Therefore, 0.005 moles of H₂SO₄ are needed for every mole of Ca(OH)₂.
What is the definition of titration?Titration, commonly referred to as titrimetry, is a method of chemical qualitative analysis used to determine the level of a certain analyte in a mixture. Titration is a crucial analytical chemistry technique that is also frequently referred to as serial dilution.
What does titration mean?The French term titrer (1543), which means the percentage of silver and gold in coins or in compositions of gold or silver, is where the word "titration" comes from. This word is a measurement of fineness of purity.
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When you go up into the mountains or fly high in an airplane, the air is
thinner and the pressure is lower. The air pressure at sea level at a
temperature of 59°F (15°C) is equal to one atmosphere (Atm), and this
is the baseline reading for determining relative pressure.
HOW DOES THIS FACT( SUB QUESTION) RELATE TO MY RESEARCH QUESTION WHICH IS
What effect does the amount of air pressure have on how far a soccer ball travels when kicked?
The fact that air pressure is lower at higher altitudes or in airplanes is relevant to your research question because it means that the amount of air pressure can affect how far a soccer ball travels when kicked. In general, the higher the air pressure, the more force the air exerts on the soccer ball, which can cause it to travel a greater distance. Conversely, the lower the air pressure, the less force the air exerts on the soccer ball, which can cause it to travel a shorter distance.
Therefore, if you were to conduct a study on how the amount of air pressure affects the distance a soccer ball travels when kicked, you would need to take into account the fact that air pressure is lower at higher altitudes or in airplanes. This could be done by measuring the air pressure at the location where the soccer ball is kicked, and comparing it to the baseline air pressure at sea level to determine the relative air pressure. You could then use this information to calculate the expected distance the soccer ball should travel based on the amount of air pressure present. This would help ensure that your results are accurate and can be compared to other studies on this topic.
Question 1 (2 points)
Determine the percent composition of chlorine in iron (III) chloride.?
Question 2 (5 points)
If we start this reaction with 40 grams of magnesium and an excess of nitric acid, how many grams of hydrogen gas could be produced?
____ Mg + ____ HNO3 à ____ Mg(NO3)2 + ____ H2
If 1.7 grams of hydrogen is actually produced, what was the percent yield of hydrogen?
Question 3 (6 points)
Magnesium metal reacts quantitatively with oxygen to give magnesium oxide, MgO. If 5.00 g of Mg and 5.00 g of O2 are allowed to react, what weight of MgO is formed, and what weight of which reactant is left in excess?
Question 4 (6 points)
Mr.T thinks the windows need cleaning (instead of preparing his lesson), (What a mistake!). So instead he starts cleaning his office because it is a disaster. He pulls out the ammonia (NH3) and gets to work. It takes him 5 hours!! During that time he decides to do a little chemistry, because he doesn't want to fall behind. He weighs his bottle of ammonia before (32.3g) and after (30.7g) he cleans. Using this information, he calculates how many atoms are present in the ammonia he used during cleaning.
Question 5 (6 points)
Mr.T keeps getting in trouble for not cleaning his plate completely after supper every night. He argues that it is because there is water-insoluble compounds on his plate so the water won't clean it. Being the cheeky chemist that he is he comes up with a method to make carbon disulfide, a natural solvent for water-insoluble compounds like fats, oils, and waxes. He is going to make millions!! The unbalanced reaction is shown below. When 27.5 g of carbon reacts with 235 g of sulfur dioxide, what mass of carbon disulfide can Mr.T make? Balance the following equation and use it to determine the limiting reagent in order to answer the problem.
Answer:
( I only know 2,3,4 )
If we start this reaction with 40 grams of magnesium and an excess of nitric acid, how many grams of hydrogen gas could be produced?
ANSWER: 40.g Mg + 1 mol HNO3 à 1 mol Mg (NO3)2+ 2.02g H2
= 3.3g H2
If 1.7 grams of hydrogen is actually produced, what was the percent yield of hydrogen?[tex]\frac{1.7g'hz}{3.3g'hz} x100 = 52% yield[/tex]
ANSWER:
Magnesium metal reacts quantitatively with oxygen to give magnesium oxide, MgO. If 5.00 g of Mg and 5.00 g of O2 are allowed to react, what weight of MgO is formed, and what weight of which reactant is left in excess?
ANSWER: 2 Mg(s) + O2(g) → 2 MgO(s)
True or False: bulk deformation of magnesium is only possible at hot-working temperatures somewhat above the melting point
True: bulk deformation of magnesium is only possible at hot-working temperatures somewhat above the melting point
Magnesium supports muscle and neuron function as well as energy synthesis in the body, among many other vital functions. Typically, low magnesium levels don't result in any symptoms. On the other hand, persistently low levels can raise your risk of osteoporosis, type 2 diabetes, high blood pressure, and heart disease.
The chemical element magnesium has the atomic number 12 and the letter Mg as its symbol. It is a glossy grey metal that is similar to the other five alkaline earth metals in terms of both physical and chemical characteristics (group 2 of the periodic table).
Only in the presence of other elements does magnesium naturally arise, and in these situations, it almost invariably possesses a +2 oxidation state. The artificially created free element (metal) is very reactive. The liberated metal emits a distinctive brilliant-white light during combustion.
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when adding refrigerant to a newly evacuated system, which of the following is the best method
When adding refrigerant to a newly evacuated system, add liquid refrigerant to the system through the liquid-line service valve. The correct option is B.
What is a refrigerant?A refrigerant is a substance that is used in a heat cycle to transfer heat from one area to another.
At room temperature, it is usually a gas. Found in almost everything that cools, and occasionally in things that heat, most notably air conditioners, refrigerators, freezers, and vehicle air conditioners.
If liquid refrigerant is added to the suction line while the system is not running, the compressor may be flooded upon startup.
The compressor will not start in some cases. Only liquid refrigerant should be added to the liquid line when the system is not running.
Thus, the correct option is B.
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Your question seems incomplete, the missing options are:
A. Add liquid refrigerant to the system through the suction- line service valve
B. Add liquid refrigerant to the system through the liquid-line service valve
C. Add vapor refrigerant to the system through the suction- line service valve
D. Add vapor refrigerant to the system through the liquid- line service valve
Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide:
CaO (s) + H₂O (1)→ Ca(OH)2 (s)
A 3.50-g sample of CaO is reacted with 3.38 g of H₂O. How many grams of water remain after completion of reaction?
The experiment's yield as a percentage was 92.4%. The reaction's balanced equation is provided below: CaO + H₂O —>Ca(OH)₂
How much water is left over when the reaction is finished?The mass of CaO that reacted and the mass of Ca(OH)2 generated by the balanced equation will then be determined.
CaO has a molar mass of 40 plus 16.
= 56 g/mol
The balanced equation yields the mass of CaO as 1 56 = 56 g.
Ca(OH)2's molecular mass is 40 + 2(16 + 1)
= 74 g/mol
The balanced equation yields the mass of Ca(OH)2 as 1 74 = 74 g.
From the above balanced equation,
56 grams of CaO were converted into 74 grams of Ca(OH)2.
When 5 g of CaO reacts, 6.61 g of Ca(OH)2 is created.
Therefore, 6.61 g is the theoretical yield of Ca(OH)2.
Finally, we will calculate the Ca(OH)2 percentage yield.
Ca(OH)2 really produced 6.11 g.
Ca(OH)2 theoretical yield is 6.61 g.
The percentage of Ca(OH)2 that was produced was 92.4%.
Consequently, the experiment's percentage yield is 92.4%.
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carbon dioxide equivalent ( co2e ) is used to compare contributions to climate change of various greenhouse gases. a study at a farm calculated the carbon dioxide equivalent for different production stages for beef and chicken production. which of the following statements is best supported by the data in the graph?
The correct statement is that beef contributes to green house effect. As a result of fermentation in cows' digestive tracts, which emits methane gas, producing beef results in a greater greenhouse gas contribution than producing chickens.
India, for instance, consumes the least meat of any nation despite having the biggest population of cattle worldwide. Cows live longer as a result, and they produce more methane overall. Additionally, cows in tropical areas produce less milk and meat, which increases the time it takes for them to reach the market. The greenhouse effect explains how heat is trapped at the Earth's surface by "greenhouse gases."You may think of these heat-trapping gases as a blanket keeping the Earth warmer than it otherwise would be. Examples of greenhouse gases include carbon dioxide, methane, nitrous oxides, and water vapor. “Feedback” is a type of water vapor that reacts physically or chemically to changes in temperature. Scientists have found that the warming effect of carbon dioxide contributes to the stabilization of Earth's atmosphere.
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As a result of fermentation in cows' digestive systems, which emits methane gas, producing beef results in a greater greenhouse gas contribution than producing chickens.
When comparing the emissions of different greenhouse gases (GHGs) based on their global-warming potential (GWP), carbon dioxide equivalents, also known as CO2e, are used to convert levels of other gases to the equivalent quantity of carbon dioxide with the same GWP.While this is going on, global-warming potential explains the relative potency of a greenhouse gas, molecule for molecule, taking into account how long it remains active in the atmosphere. The following are some of the greenhouse gases included in the Kyoto Protocol: Carbon dioxide (CO2). Nitrous oxide, methane (CH4) (N2O). Hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), sulfur hexafluoride (SF6), and nitrogen trifluoride are examples of fluorinated gases (NF3).
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Consider the generic ionic compounds with the formulas AX and BY and the following solubility rules: AX soluble; BY soluble; AY soluble; BX insoluble Let circles represent A+ ions, squares represent B+ ions, triangles represent X? ions, and diamonds represent Y? ions. We can then represent solutions of the two compounds (AX and BY) as follows:
Draw a molecular-level representation showing the result of mixing the two solutions.
Drag the appropriate labels to their respective targets. Note: not all labels will be used.
As the BX is insoluble but is an ionic salt that shows that the reaction forms the precipitate and BX will remain settled at the bottom. While AY is soluble salt means in an aqueous solution it will remain in form of ions.
The distance between the A+ circle and Y- y-diamond will be represented as larger than the distance between the B+ square and X- triangle. Distance shows the interaction of water molecules with ions.
The reaction is = AX(aq) + BY(aq) --> AY(aq) + BX(s)
Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions. For binary ionic compounds name the compound by writing the name of the cation first and then the name of the anion.
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sodium borohydride is reactive and a selective reducing agent than lithium aluminum hydride.
When compared to aluminium hydride, the anion of Sodium borohydride is substantially less reactive. With protic solvents like water, it reacts very slowly. It can be utilised in an ethanol-based solvent or a basic aqueous solution.
Sodium borohydride works well as a reducer. It works just as well as lithium aluminium hydride (LiAlH4) for reducing aldehydes and ketones to alcohols while being less potent. It typically won't decrease esters, carboxylic acids, or amides by itself (although it will reduce acyl chlorides to alcohols). Sodium borohydride is more chemoselective in action because it is less reactive than lithium aluminium hydride. At room temperature, it only reacts slowly with most alcohols and water, and it reduces with this reagent.
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Make an ionic equation from: V2O5 (s) + 6HCl (aq) => 2VOCl3 + 3H2O (l)
The net ionic equation of the reaction is; [tex]6H^+(aq) + 3O^{2-} (aq) ------ > 3H_{2} O(l)[/tex]
What is the net ionic reaction equation?We know that the ionic reaction equation has to do with the equation that shows the species that underwent a change in the reaction. In this case, we have to be able to look at the reaction, break into ions before we can be able to make the molecular reaction equation.
We have;
Molecular equation; [tex]V_{2}O_{5} (s) + 6HCl (aq) ---- > 2VOCl_{3}(aq) + 3H_{2}O (l)[/tex]. We can see the species that have undergone a change from here and the net ionic equation can now be easily written as;
[tex]6H^+(aq) + 3O^{2-} (aq) ------ > 3H_{2} O(l)[/tex]
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