Ethane gas, C2H6(g), has a combustion enthalpy of roughly -1.5*103 kJ/mol.
Compared to pure methane, gaseous blends with ethane as a component have higher thermal efficiency and shorter combustion times.
Calculate the amount of fuel that has been burned in moles?This can be accomplished by calculating the difference between the mass of the fuel before and after the water has heated. Calculate how much energy is released by one mole of the material. By dividing by 1000, you may obtain the answer in KJ. This gives you the J/mol-1.
What factors affect combustion enthalpy?The amount of H in a reaction is determined by the physical states of the reactants and products (gas, liquid,).
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if a compound rotates plane-polarized light in a direction, the compound is called dextrorotatory, and is labeled d or . rotation for an levorotatory compound is labeled l or
If a compound rotates plane-polarized light in a clockwise direction, the compound is called dextrorotatory, and is labeled d
If a compound rotates plane-polarized light in a anti- clockwise direction, the compound is called levorotatory compound is labeled as l.
An enantiomers rotate the plane polarized light in clockwise direction or positive direction is called dextrorotatory. given as [(+), d- ]. while enantiomers that rotates plane polarized light in anti - clock wise direction or negative direction is called levorotatory compound . given as [ (-) , l-].
Thus, If a compound rotates plane-polarized light in a clockwise direction, the compound is called dextrorotatory, and is labeled d
If a compound rotates plane-polarized light in a anti- clockwise direction, the compound is called levorotatory compound is labeled as l.
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Question 3 please
How many mL of … are required…
Strong and Weak Foundations Bases provide a similar problem: a strong base is one that is completely ionized in solution.
What is true for a strong base?Strong and Weak Foundations Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution.
Acids and bases are incompatible. Acids and bases will balance one another out. A solution's pH can be changed by acids but not by bases. While bases give hydrogen ions (H+), acids give hydroxide ions (OH-).
The aqueous solution of the salt formed by neutralisation of weak acid and strong base possesses basic nature, while aqueous solution of salt produced by neutralisation of weak base and strong acid possesses acidic nature.
The complete question is:
A strong base or salt in solution exist predominately as electrons in solution.
a) True
b) False
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5. How many different types of atoms are in oxytocin?
Answer:
Oxytocin is a peptide of nine amino acids (a nonapeptide).
Explanation:
Answer:Oxytocin is a peptide of nine amino acids (a nonapeptide). The sequence is cysteine - tyrosine - isoleucine - glutamine - asparagine - cysteine - proline - leucine - glycine (CYIQNCPLG).
Explanation:
Takisha conducted an experiment to determine the effect of salt on the boiling point of water. She measured the boiling points of 100 ml of water with salt added in 5 g increments. As a control, she also recorded the temperature of water with no salt added. What is the purpose of this control?.
The control provides a reference value for comparison to samples in which a variable is changed.
What effect does salt have on the experiment with water boiling point?Giddings said that the presence of salt makes it more difficult for water molecules to escape from the pot and transition into the gas phase, which occurs when water boils. Salted water has a higher boiling point as a result.What happens if you experiment with adding salt to water?When salt is added to water, the water becomes denser. Salt provides bulk to the water as it dissolves in it (more weight to the water). By making the water denser, more items that would normally sink in fresh water can float on the surface.What does salt and water come to?Since salt water heats up more quickly and reaches its boiling point first, it will boil more quickly than pure water. When pure solvent (in this case, water) and a dissolved material (salt) are combined to form a solution, boiling elevation point occurs (the salt water).To learn more about boiling point of water visit:
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which of the folllowing is the Arrhenius definition of an acidl
Answer:
Arrhenius defined an acid as a compound that increases the concentration of hydrogen ion (H +) in aqueous solution. Many acids are simple compounds that release a hydrogen cation into solution when they dissolve.
A 3.2 L sample of a gas at 2 atm of pressure is expanded until its volume is 5 L. What will be thepressure in atm of the expanded gas sample? Include proper units (abbreviated). Round your answer to two decimal places.
1.28atm
Explanations:According to Boyle's law
P1V1 = P2V2
where
P is the pressure
V is the volume
Given the following
P1 = 2atm
V1 = 3.2L
V2 = 5L
Required
Final pressure P2
Substitute
P2 = P1V1/V2
P2 = 2*3.2/5
P2 = 6.4/5
P2 = 1.28atm
Hence the pressure in atm of the expanded gas sample
as you climb to the top of a hypothetical mountain in florida, air pressure decreases from 1 atm to 0.75 atm at the peak. what will the partial pressure of oxygen be at the top of the mountain?
As you climb to the top of a academic mountain in florida, air pressure decreases from 1 atm to0.75 atm at the peak. what will the partial pressure of oxygen be at the top of the mountain.
Pressure
Pressure( symbol p or P) is the force applied vertical to the face of an object per unit area over which that force is distributed.
Colorful units are used to express pressure. Some of these decide from a unit of force divided by a unit of area; the SI unit of pressure, the pascal( Pa), for illustration, is one newton per forecourt metre( N/ m2); also, the pound- force per forecourt inch( psi) is the traditional unit of pressure in the Homeric and U.S. customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere( atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units similar as the centimeter of water, millimeter of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.
Pressure is the quantum of force applied vertical to the face of an object per unit area. The symbol for it's" p" or P.( 2) The IUPAC recommendation for pressure is a lower- case p.( 3) still, upper- case P is extensively used. The operation of P vs p depends upon the field in which one is working, on the near presence of other symbols for amounts similar as power and instigation, and on writing style.
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At a fixed temperature and pressure, the volume occupied by a gas is _____ proportional to the number of moles of gas present. For ideal gases under these conditions, equal _____ of gas contain equal numbers of particles or moles.
Answer:
that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
An individual cell of an entire multicellular organism may be between 70% and 95% water, moreover, cells
and organisms resist rapid temperature changes. This important characteristic is based on what property of
water?
C. the density of water
D. one water can covalently bond to another
water molecule
A strong ionic bonds between water
molecules
B. the specific heat of water
B. the specific heat of water
What is a multicellular organism?A multicellular organism is an organism that consists of many cells. The term "multi" is technically used to refer to something that is more than one, so "multicellular" means more than one.
Multicellular organisms evolve through cell specialization and division of labour. Cells become efficient at one process and depend on other cells to carry out different processes. All the cells work in coordination to ensure the proper functioning of the body.
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What volume of each of the following bases will react completely with 23.00 mL of 0.500 M HCl?
(a) 0.100 M NaOH
mL
(b) 0.0500 M Ba(OH)2
mL
(c) 0.250 M KOH
mL
The volume of each of the following bases will react completely with 23.00 mL of 0.500 M HCl are given below ,
( a ) 28 ml
( b ) 230 ml
( c ) 46 ml
The volume of each of the following bases will react completely with 23.00 mL of 0.500 M HCl can be calculated as ,
Formula used : [tex]M_{1} V_{1}[/tex] = [tex]M_{2} V_{2}[/tex] ( 1 )
( a )
Given
[tex]M_{1}[/tex] = 0.500 M
[tex]M_{2}[/tex] = 0.100 M
[tex]V_{1}[/tex] = 23.00 mL
[tex]V_{2}[/tex] = ?
Now putting the all given data in equation ( 1 ) we get the value of volume
0.500 M × 23.00 mL = 0.100 M × [tex]V_{2}[/tex]
[tex]V_{2}[/tex] = 0.500 M × 23.00 mL / 0.100 M = 28 ml
( b )
Given
[tex]M_{1}[/tex] = 0.500 M
[tex]M_{2}[/tex] = 0.0500 M
[tex]V_{1}[/tex] = 23.00 mL
[tex]V_{2}[/tex] = ?
Now putting the all given data in equation ( 1 ) we get the value of volume
0.500 M × 23.00 mL =0.0500 M × [tex]V_{2}[/tex]
[tex]V_{2}[/tex] = 0.500 M × 23.00 mL / 0.0500 M = 230 ml
( b )
Given
[tex]M_{1}[/tex] = 0.500 M
[tex]M_{2}[/tex] = 0.250 M
[tex]V_{1}[/tex] = 23.00 mL
[tex]V_{2}[/tex] = ?
Now putting the all given data in equation ( 1 ) we get the value of volume
0.500 M × 23.00 mL = 0.250 M × [tex]V_{2}[/tex]
[tex]V_{2}[/tex] = 0.500 M × 23.00 mL / 0.250 M = 46 ml
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A chemistry student as Agora is calculating the average atomic mass of potassium using the following data.
Isotope k-39 Relative abundance 93.12% atomic mass 38.964 amu.
Isotope k-41 Relative abundance 6.88% atomic mass 40.962 amu.
The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table. What did the student do incorrectly?
The student made a mistake in substituting the wrong values of the relative abundance of the isotopes Potassium-39 and Potassium-41. That is why his answer was wrong.
The student exchanged the values of the relative abundance of the isotope values. That is why it has resulted in the wrong value of the average atomic mass. On substituting the correct values using the following formula, we get the atomic mass of the respective isotopes as,
atomic mass = Mass x Relative abundance
atomic mass of K⁴¹₁₉ = 40.962 x 0.0688
the atomic mass of K⁴¹₁₉ = 2.8181856amu
Similarly, for the mass of K₃₉¹⁹ = 38.964 x 0.9312
= 36.28327amu
Thus the average atomic mass of Potassium is given by,
Average atomic mass of potassium = Mass of K₃₉¹⁹ + Mass of K⁴¹₁₉
The average atomic mass of potassium = 36.2832 +2.8181
The average atomic mass of potassium = 40.962amu
Hence, the correct value of the average atomic mass is thus obtained.
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16.) If you have 54 mg of a substance that has a density of 1.2 g/mL how many mL of the substance do you
have?
The volume of the substance with mass of 54mg and density of 1.2g/mL will be 0.045 mL.
How much "stuff" is contained in a specific quantity of space is determined by its density. For instance, a block of the harder, lighter element gold (Au) will be denser than a block of the heavier element lead (Pb) (Au). Styrofoam blocks are less dense than bricks.
Mass per unit volume serves as its definition.
We know that, Density = mass of substance / volume of substance
Given,
mass = 54 mg = 0.054 g
Density = 1.2g/mL
D = m/ v
1.2 = 0.054 / v
1.2 × v = 0.054
v = 0.054 / 1.2
v = 0.045 mL
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what is the order of chemical process in the synthetic cycle for generation of fatty acid? what is the order of chemical process in the synthetic cycle for generation of fatty acid? condensation, dehydration, reduction and reduction reduction, dehydration, condensation and reduction condensation, reduction, dehydration and reduction reduction, condensation, dehydration and reduction
The order of synthetic cycle for generation of fatty acid is Condensation > Reduction > Dehydration > Reduction.
What is fatty acid?
An aliphatic carboxylic acid with a saturated or unsaturated chain is referred to as a fatty acid and is employed in chemistry, particularly in biochemistry. In some species, like microalgae, fatty acids make up a significant portion of the lipids (up to 70% of the total weight). However, in some other creatures, such as triglycerides, phospholipids, and cholesteryl esters, fatty acids are not found in their freestanding form. In all of these forms, fatty acids are essential nutritional sources of energy for animals and essential cellular building components.
The synthetic synthetic cycle for the generation of fatty acids takes place in such a way that at first Condensation happens then Reduction then Dehydration then again Reduction happens.
The cycle of condensation, reduction, dehydration, and reduction continues until palmitoyl‐ACP gets completely made.
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a rigid plastic container holds 6.38 l of methane gas at 127 torr pressure when the temperature is 26.0 degrees celsius. how much pressure will the gas exert if the temperature is raised to 43.1 degrees celsius?
A pressure of 210.5 torr will be exerted by the gas if the temperature is raised to 43.1°C.
What are pressure and temperature?Temperature as we have been learning from childhood is the degree of hotness or coldness.Pressure is the force exerted per unit area that is the force you exert on a given surface.By using the gas equation that is PV=NRT we can solve his question to know the pressure exerted when the temperature is changed.According to Charles's law P₁/T₁ = P₂/T₂
Given, P₁ is 127 torr and T₁ is 26°C and T₂ is 43.1°C.
127/ 26 = P₂/ 43.1
P₂ = (127 × 43.1) / 26
P₂ = 5473.7 / 26
P₂ = 210.5 torr
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is the following sentence true or false? every chemical or physical change in matter includes a change in energy
A sealed weather balloon contains 10.0 L of helium gas at 5 °C. What is the volume of helium in the weather balloon at 15 °C?
Volume of the helium in weather balloon at 15 °C with initial volume of 10L and temperature of 5 °C is 30 L
Given that, Initial volume (V1) = 10 L
Initial Temperature (T1) = 5 °C
Final Temperature (T2) = 15 °C
By gas law,
V1 / V2 = T1 / T2 (Pressure constant)
10 / V2 = 5 / 15
V2 = (15 / 5) * 10
V2 = 3 * 10
V2 = 30 L
Thus, the volume of helium in the weather balloon at 15 °C is 30 L
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Pls tell me the answers for the ones that aren’t answered
Answer:
2 - B, 5 - D, 6 - A
Explanation:
2 - Penicilin was actually discovered on accident!
5 - Microbes were discovered around the mid-1600s
6 - Choice A seems to be correct here, noting that the answers of C and D are marked out and B seems a bit far-fetched (from my current knowledge)
A typical frostless refrigerator uses 655 kWh of energy per year in the form of electricity. Suppose that all of this electricity is generated at a power plant that burns coal containing 3. 1% sulfur by mass and that all of the sulfur is emitted as SO2 when the coal is burned.
If all of the SO2 goes on to react with rainwater to form H2SO4 , what mass of H2SO4 is produced by the annual operation of the refrigerator? ( Hint : Assume that the remaining percentage of the coal is carbon and begin by calculating ΔH∘rxn for the combustion of carbon. )
The annual operation of the refrigerator produces 6835.5 g of sulfuric acid. This calculation is made assuming that the enthalpy of combustion for sulfur is equal to the enthalpy of combustion for carbon.
First, we are going to transform 655 kWh into kilojoules. Because 1 kWh = 3.6e6 J = 3600 kJ, that means that a typical frostless refrigerator uses 655 * 3600 kJ = 2358000 kJ of energy on a yearly basis.
The enthalpy of combustion for carbon (or enthalpy of carbon dioxide formation) is -393 kJ/mol. That means that we can calculate the number of moles of carbon needed to produce 2358000 kJ of energy.
2358000 kJ / 393 kJ/mol = 6000 mol of carbon
Because the molar mass of carbon is 12 g/mol we need
6000 mol * 12 g/mol = 72000 g of carbon
If 3.1% of this carbon is actually sulfur, then we will burn 0.031 * 72000 g = 2232 g of sulfur during one year. The molar mass of sulfur is 32 g/mol, which means we transformed 2232 g / 32 g/mol = 69.75 mol of sulfur into sulfur dioxide and further into sulfuric acid. Because 1 mol of sulfur is needed to produce 1 mol of sulfuric acid, we produced 69.75 moles of sulfuric acid.
The molar mass of sulfuric acid is 98 g/mol, so over the course of one year, we produced 69.75 mol * 98 g/mol = 6835.5 g of sulfuric acid.
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when 4.14 moles of ibr gas is initially injected into a 1 l container at 150 c, the kc for this reaction is 8.5 calculate the equilibrium concentration of i2
By using the expression for the equilibrium constant for the reaction and solving the appropriate quadratic equation, we can calculate that the equilibrium concentration of iodine will be 1.77 M.
The balanced reaction equation for this reaction looks like this:
[tex]2 IBr[/tex] → [tex]I_{2}+Br_{2}[/tex]
The expression for the equilibrium constant will look like this:
[tex]K_{c} =\frac{[I_{2} ][Br_{2} ]}{[IBr]^{2} }[/tex]
Because all the volumes are the same, we can just use the moles of all reaction components instead of concentrations. Now, because there was no iodine or bromine when the reaction began, all iodine and bromine present at equilibrium are formed by IBr decomposition, their concentrations will be the same (X). The concentration of IBr will be reduced by 2X, so we can plug that into the equilibrium constant expression:
[tex]8.5=\frac{X^{2} }{(4.14-2X)^{2} }[/tex]
We transform this expression to get a quadratic equation:
33X² - 140.76X + 145.6866 = 0
When we solve for X, one solution is 2.49 M (which is impossible, because 4.14 moles of IBr can create a maximum of 4.14 mol / 2 = 2.07 mol of iodine), and the other (correct) solution is 1.77 M.
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What is the resistance of a light bulb if a potential difference of 120 V will produce a current of 0.5 A in the bulb?
0.0042
0.5
60
240
Answer:
120/0.5
=240ohms
12. Which of these are the reactants in the photosynthesis equation?
O CO2 and water
02 and sugar
Energy and CO2
Sunlight and sugar
Answer:
The reactants of photosynthesis are carbon dioxide and water.
The relative abundance and atomic masses are: 30.8% for mass of 64.93u
Answer:
The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% for mass = 62.93 amu, and 30.8% for mass = 64.93 amu.
Determine what elements are denoted by the following electron configurations:
6) 1s²2s²2p 3s²3p4
7) 1s²2s²2p 3s²3p64s²3d¹04p65s¹
8) [Xe] 6s²4f¹2
9) [Xe] 6s4f45d10
10) [Ne]3s²3p4
The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.
What is electron configurations?
One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. Each element's position on the periodic table determines the specific electron configuration of that element. The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.
A standardized notation is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript. For instance, carbon's (atomic number: 6) electronic configuration is 1s22s22p2.
Hence. The elements are denoted by the electron configurations are,
1) Beryllium
2) Boron
3) Magnesium
4) Silicon
5) Phosphorus
6) Calcium
7) Nickel
8) Krypton
9) Bromine
10) Strontium
The complete question is,
Determine the elements denoted by the following electron configurations.
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Need help finding the moles on this question ?
In areaction, the number of moles consumed and produced have the same ratio as the coefficients on the balanced equation.
So, to calculate the number of moles of any chemical on the reaction given the number of moles of any other, we can use a rule of three.
We put the compound or atom we want on the first column and the one we have information of on the second, and their coefficients on the second row:
We want Al and we have information about Al₂O₃, and their coefficients on the balanced equation are 4 and 2, so:
Al --- Al₂O₃
4 2
Now, we use thise placements to write the equation:
[tex]\frac{n_{Al}}{4}=\frac{m_{Al_2O_3}}{2}[/tex]Where the n stands for the number of moles. Now we solve for Al:
[tex]\begin{gathered} \frac{n_{Al}}{4}=\frac{m_{Al_2O_3}}{2} \\ n_{Al}=4\frac{m_{Al_2O_3}}{2} \\ n_{Al}=2m_{Al_2O_3} \end{gathered}[/tex]And since we know the number of moles of Al₂O₃, we have:
[tex]\begin{gathered} n_{Al_{2}O_{3}}=0.800mol \\ n_{Al}=2n_{Al_{2}O_{3}} \\ n_{Al}=2\cdot0.800mol \\ n_{Al}=1.600mol \\ n_{Al}\approx1.60mol \end{gathered}[/tex]Where the last step we did an approximateion to get to 3 significant figures.
So, the number of moles of Al consumed is 1.60 mol.
The electron configurations of two unknown atoms are shown.
Electron Configuration
Based on the electron configuration of each atom, what is the number of valence electrons for each atom?
a Atom X = 1; Atom Y = 1
b Atom X = 1; Atom Y = 7
c Atom X = 10; Atom Y = 10
d Atom X = 11; Atom Y = 17
Answer:
b Atom X = 1; Atom Y = 7
Explanation:
a valence electron is an electron in the outer shell
So X has 1 in outer shell
Y has 7 in outer shell
1. Which of the following surfaces does NOT absorb moisture? *
OCardboard
O Metal
Magazine cover
Rough wood
Metal of the following surfaces does NOT absorb moisture.
The correct option is B.
How would you define moisture?The presence of a liquid, things like water, even in minute amounts, is referred to as moisture. Examples of locations where small amounts of water can be found include the air (humidity), foods, and some commercial goods. The amount of water vapor in the atmosphere is also alluded to as moisture.
What causes moisture?Warm, moist weather that comes in touch with a cool surface, such uninsulated cold water mains, causes moisture to condense into water droplets. Numerous other represent the lowest including cooking, taking a bath, drying clothing, washing the dishes, and others also release moisture into the air.
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The complete question is -
Which of the following surfaces does NOT absorb moisture? *
A-Cardboard
B- Metal
C-Magazine cover
D-Rough wood
BRAINLIST AND 30 POINTS
Which of the following is NOT a physical change? [Choose all that apply.]
Group of answer choices
melting ice cream
water evaporating from a puddle
making elephant toothpaste
roasting a marshmallow
mashing potatoes
burning a piece of paper
cutting wood
Answer: Making elephant toothpaste, roasting a marshmallow, And burning a piece of paper are all examples of chemical changes.
Explanation:
A chemical change is when the atoms in something have broken old bonds and made new ones.
Making elephant toothpaste is NOT a physical change because two things are mixed together to make a chemical change and therefore it's a chemical change not a physical change.
Burning a piece of paper is not a physical change because when a paper is burned it turns into ash/dust and it changes its chemical composition. Therefore it's a chemical change, not a physical one
the pressure inside a hydrogen-filled container was 2.10 atm at 21 ∘c . what would the pressure be if the container was heated to 89 ∘c ? express your answer with the appropriate units.
By utilizing ideal gas laws and the conversion of given temperatures into absolute temperatures we can calculate that the pressure of the gas at 89 °C will be 2.59 atm.
Amonton's law (one of ideal gas laws) states that at constant volume and number of moles of the ideal gas, the pressure that the gas exerts is directly proportional to the temperature of the gas. In mathematical form:
[tex]\frac{P_{1} }{T_{1} } = \frac{P_{2} }{T_{2} }[/tex]
P is the pressure of the gas while T is absolute temperature (in Kelvins). First, we convert temperature in Celsius to Kelvins:
T1 = (21 + 273) K = 294 K
T2 = (89 + 273) K = 362 K
Now, we transform the Amonton's law equation so that we can calculate the pressure at the higher temperature:
P2 = T2 * P1 / T1
Finally, we plug the known values into the transformed equation:
P2 = 362 K * 2.10 atm / 294 K = 2.59 atm
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Which two terms describe this type of data?
A. Qualitative
B. Continuous
C. Quantitative
cm
D. Discrete
a. the polarities of the bonds must not cancel each other out. b. all of the bonds must be polar. c. there must be at least one nonbonding pair of electrons. d. the molecule must be symmetrical. e. double or triple bonds do not count. f. all of the bonds must be nonpolar. g. all of the terminal atoms around a central atom must have different identities. h. at least one bond must be polar.
For polar molecules :
a) The polarities of the bonds must not cancel each other out is True.
b) All of the bonds must be polar is false. if we have one polar bond the molecule is polar.
c) there must be at least one nonbonding pair of electrons is false.
d) the molecule must be symmetrical is False.
e) double or triple bonds do not count is false
f) all of the bonds must be nonpolar is false.
g) all of the terminal atoms around a central atom must have different identities is False.
h) at least one bond must be polar is true.
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