The noble gases have similar chemical properties because they have the same number of valence electrons.
What are noble gases?The noble gases are the gases that are found in the last group of the periodic table. These are the gases that have been said to be unreactive under normal conditions. Thee have been found to react only under stringent conditions as we can see.
Given the fact that the octet rule states that an element that contains eight electrons in its outermost shell would be unreactive and all the noble gases have complete octets hence the noble gases are unreactive.
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What do these two changes have in common?
shaking up salad dressing
adding dish soap to water in a sink
Select all that apply.
Both are only physical changes.
Both are caused by heating.
Both are chemical changes.
Both are caused by cooling.
According to the given statement these two changes have in common in Both are only chemical changes.
The correct option is C.
What changes do chemicals make?Chemical changes happen when bonds among atoms or molecules are formed, broken, or both. This suggests that a substance is transformed from one with a particular set of characteristics (such melting point, color, flavor, etc.) into one with a different set of characteristics.
What function does chemical change ?The majority of our energy is produced by chemical reactions. Many different types of materials are tested, identified, and analyzed using chemical reactions (such as pool testing kits and forensic tests from TV shows like "CSI").
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at standard pressure, water has unusual properties that are due to both its molecular structure and intermolecular forces. for example, although most liquids contract when they freeze, water expands, making ice less dense than liquid water. water has a much higher boiling point than most other molecular compounds having a similar gram-formula mass. determine the total amount of heat, in joules, required to completely vaporize a 50.0-gram sample of h2o( ) at its boiling point at standard pressure.
The heat required to vaporize this sample at standard pressure is 113,270 J.
We can calculate the amount of heat (Q) needed to vaporize 50.0 grams of water by using water's heat of vaporization (q) at 100 °C (boiling point of water) - 40.8 kJ/mol, and the number of moles of water (n).
Q = n * q
The heat of vaporization describes the amount of energy needed to be introduced to a single mol of water at 100 °C to break the intermolecular interactions between molecules of water so it changes to a gaseous state.
To calculate the number of moles of water, we are going to use the mass of water (m = 50.0 g) and its molar mass (M = 18.01 g/mol):
n = m/M
n = 50.0 g / 18.01 g/mol
n = 2.7762 mol
Now we can calculate the amount of heat needed:
Q = 2.7762 mol * 40.9 kJ/mol
Q = 113.27 kJ
Q = 113,270 J
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which of the following situations contains an example of a chemical reaction?
A bicycle rusting after it is left in the rain is an example of a chemical reaction because it involves oxidation (Option d).
What is a chemical reaction?A chemical reaction can be defined as a phenomenon in which one or more substances called reactants react to form one or more different compounds, which are known as products.
A chemical reaction may include an enzyme that works to increase the seed of the reaction in normal conditions by lowering the activation energy of the reaction.
Therefore, we can conclude that a chemical reaction such as oxidation in a bicycle is a process where reactants combine or break down to form the products of such reaction.
Complete question:
Which of the following situations contains an example of a chemical reaction?
a. Ice forming after water is placed in a freezer
b. Watercolor paint drying on paper
c. a sugar cube dissolving in a glass of water
d. a bicycle rusting after it is left in the rain
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2- still in slide 45, what does this pattern tell you about the underlying material? is it homogeneous or heterogeneous? is this material easily erodible? (think back to part 1 of this lab.)
The linear features in the given image resemble a homogenous, radial drainage pattern type volcanic river which is not easily erodible.
A river that emerges from the volcano's center flank is its most notable feature. The result is a volcanic river feature resembling a triangle-shaped accumulation of pebbles, sand, and even finer sedimentary rocks, like silt.
As the volcanic river systems exit, the drainage pattern is radial. For mountainous terrain, we often see a radial drainage pattern.
We can observe that the drainage pattern of the volcanic river is in a clear and well-oriented position, indicating that the underlying material is homogenous. We cannot obtain such a sort of characteristic in a heterogeneous material and thus the substance is homogenous because of this.
The materials of the volcanic river are not easily erodible since they are highly robust.
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HELP HURRY WILL GIVE BRAINLIEST
How many mols are present in 3.07 grams of carbon?
Answer:
It's 0.2556054185018347 moles
You have an elodea sprig in a test tube containing bromothymol blue. Then you watch it for several days. At what time of day will the oxygen level in the tube be the lowest?.
Answer:
Prior to sunrise
when 15.0 g
of steam drops in temperture from 275.0°C
to 250° C, how much heat. energy is released?
Answer: The amount of heat needed to raise a substance's temperature by one Kelvin per kilogram. The heat needed to raise the temperature of a given substance with known mass can be calculated as follows:
ΔH=mCΔT
ΔH=Amount of heat energy supplied
m=Mass of the substance = 15 g
ΔT=Change in temperature = Tfinal−Tinitial = 250° C - 275.0°C = -25°C
C=Specific heat capacity = 2.02 J/g °C
ΔH=mCΔT
after putting the given values,
ΔH= -757.5 J
The formula also shows that heat energy is released (negative value) when the change in temperature is negative, i.e., when the temperature of a substance falls.
what is the volume of 1.25 moles of an ideal gas, in liters, if it has a tempature of 600K, and pressure of 2.65 atm
The volume of an ideal gas in a certain pressure, V = 2,353 m³.
Equation :To calculate the volume of ideal gas at a temperature use the formula,
PV = nRT
Where,
P is pressure
V is volume
n is number of moles
R is gas constant
T is temperature
Given values are,
P = 2.65 atm
n = 1.25 moles
R = 8.314 J/mol.k
T = 600K
V = ?
Now that when we have entered the data into the formula,
2.65 atm x V = 1.25 mol x 8.314 J/mol.k x 600 K
V = 6,235.5 / 2.65
V = 2,353 m³
Thus, the volume of an ideal gas in a certain pressure, V = 2,353 m³.
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5.68 allied health acetylsalicylic acid (aspirin) can be synthesized by combining salicylic acid and acetic acid through a condensation reaction. the group from phenol on the salicylic acid condenses with the carboxylic acid group of acetic acid, forming acetylsalicylic acid. draw the structure of acetylsalicylic acid.
Allied health acetylsalicylic acid means aspirin can be synthesized by combining salicylic acid and acetic acid through a condensation reaction. the group from phenol on the salicylic acid condenses with the carboxylic acid group of acetic acid, forming acetylsalicylic acid and condensation reaction means any of a class of reactions in which two molecules combine usually in the presence of a catalyst with elimination of water or some other simple molecule
Aspirin can be relieve pain and reduce the serious problems like heart attacks and strokes and aspirin are form of combining salicylic acid and acetic acid through in which two molecules combine in the presence of catalyst with elimination of water and the reaction is
salicylic acid + acetic acid → acetylsalicylic acid
And then phenol on the salicylic acid condenses with the carboxylic acid group of acetic acid means
phenol + salicylic acid → carboxylic acid group of acetic acid
Structure of acetylsalicylic acid are given below
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How will you show that carbon dioxide is havier than air?
Answer:
There's an experiment that you can try to see if carbon dixide is heavier than air.
Explanation:
At room temperature, carbon dioxide has higher density (ρ = 1.98 kg·m -3) than air (ρ = 1.29 kg·m -3). The density of gas, however, significantly depends on its temperature. Carbon dioxide produced by burning has higher temperature than the surrounding air.
Why is CO2 heavier than the air?
Short answer is CO2 is heavier than ambient air, but it does not drift to the ground as there is a lot of mixing going on in ambient air. ... Carbon dioxide, also known by the chemical formula CO2, has a higher density than the other gases found in air, which makes CO2 heavier than the air.
Which equation shows the correct relationship between mechanical energy, kinetic energy, and potential energy? me = ke pe me ke = pe me = ke â€" pe me pe = ke
The correct relationship between mechanical energy, kinetic energy, and potential energy is M.E = P.E + K.E.
Mechanical energy, is the energy that an object possesses when it is in motion or the energy that an object stores due to its location. Renewable energy is also fueled by mechanical energy. In order to efficiently produce electricity or convert energy, many sources of renewable energy depend on mechanical energy.
The expression for total mechanical energy is as follows
M.E = P.E + K.E
As total mechanical energy is the sum of all the kinetic as well potential energy stored in the system.
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What is the energy of light whose wavelength is 4.06 x 10¹¹ m?
[tex]\quad \huge \quad \quad \boxed{ \tt \:Answer }[/tex]
[tex]\qquad \tt \rightarrow \:{4.88 × 10}{-15} \:\: joules [/tex]
____________________________________
[tex] \large \tt Solution \: : [/tex]
By using Plank's equation ;
[tex]\qquad \tt \rightarrow \: E = \dfrac{hc}{ \lambda} [/tex]
[tex]\qquad \tt \rightarrow \: E = \dfrac{6.6 \times 10 {}^{ - 34} \sdot3 \times 10 {}^{8} }{ 4.06 \times 10 {}^{ - 11} } [/tex]
[tex]\qquad \tt \rightarrow \: E = \dfrac{19.8}{4.06} \times (10 {}^{ - 26} \times 10 {}^{ 11 } )[/tex]
[tex]\qquad \tt \rightarrow \: E = 4.88 \times 10 {}^{ - 15} \: \: \: joules[/tex]
Answered by : ❝ AǫᴜᴀWɪᴢ ❞
43. Answer the following questions using principles of chemical bonding and molecular structure.
(a) Consider the carbon dioxide molecule, CO2, and the carbonate ion, CO3²-
(ii) Account for the fact that the carbon-oxygen bond length in CO3²- is greater than the carbon- oxygen bond length in CO₂.
(b) Consider the molecules CF4, and SF4.
(i) Draw the complete Lewis electron-dot structure for each molecule.
Yes the fact is the carbon-oxygen bond length in CO2^-2 is greater than the carbon-oxygen bond length in CO2.
What is chemical bond and how the carbon-oxygen bond in carbonate is greater than the same in CO2?In every chemical compound is present the elements that are bonded with chemical bonds.Though there are different means of interaction , here we will only talk of chemical bonds .In the principle of chemistry chemical bond or interaction is considered to be the strongest .Actually all the bonds in the carbonate ion are equal , bonda are not fixed and show reasonance.The carbon of carbonate ion is bonded with three oxygen atoms.To know more about chemical bond visit:
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HELP ASAP PLS
The image below shows charged particles bouncing around.
A square is shown with the title State of Matter. Few circles with positive and negative sign are shown inside the square. Long arrows pointing outwards from the edge of each circle are shown
Which state of matter is most likely represented in the image? (4 points)
a
Gas
b
Solid
c
Liquid
d
Plasma
pls give me the correct answer!
Answer:
Your answer is C. Gas
Explanation:
Particles in a solid stay still and are compacted
Particles in a liquid move around more than they do when they are frozen
Particles in a gas bounce around more freely than both liquids and solids because they are being forced to be compacted in one area or shape
Hope this helps! Good Luck! 0w0
Answer: C, gas
the only one that would make sense
Aluminum metal is produced by passing an electric current
through a solution of aluminum oxide (Al2O3) dissolved in
molten cryolite (Na3AlF6). Calculate the molar masses of
Al2O3 and Na3AlF6
Aluminum metal is produced by passing an electric current through a solution of aluminum oxide (Al2O3) dissolved in molten cryolite (Na3AlF6). the molar masses of Al2O3 is 101.96g/mol and Na3AlF6 is 209.94g/mol.
Define electric current.Electric currents are streams of electrically charged particles, such as electrons or ions, moving through a conductor or a void. It is calculated as the net rate of electric charge flowing through a surface or into a control volume. 622 The moving particles are the charge carriers, which can be any of a variety of particle types depending on the conductor. Electric circuits typically use electrons flowing through a wire as charge carriers. In semiconductors, they could either be electrons or holes. In an electrolyte, ions are the charge carriers, whereas in plasma, an ionized gas, ions and electrons are the charge carriers.
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Compounds consist of?
a) only carbon and water.
b)substances that can be separated by a centrifugation
c)different chemically combined element
two or more elements physically combined d) two or more elements plivaically combined.
a mixture of 0.47 mole of h2 and 3.59 moles of hcl is heated to 2800°c. calculate the equilibrium partial pressures of h2, cl2, and hcl if the total pressure is 2.00 atm. for the reaction h2(g) 1 cl2(g) δ 2hcl(g) kp is 193 at 2800°c.
The partial pressures, based on the equilibrium constant, are 0.2825 atm for hydrogen, 0.0509 atm for chlorine and 1.6666 atm for HCl.
We know that:
[tex]pH_{2} + pCl_{2} + pHCl = 2 atm[/tex]
pH₂ - partial pressure of hydrogen
pCl₂ - partial pressure of chlorine
pHCl - partial pressure of HCl
We also know that the expression for the equilibrium constant looks like this:
[tex]K_{p} =\frac{pHCl^{2} }{pH_{2}*pCl_{2} } =193[/tex]
Because the total coefficients on the left and right sides of the reaction are equal (=2), then Kp = Kc. Finally, all the chlorine present in the mixture comes from HCl degradation. If we mark the partial pressure of chlorine as X, then:
[tex]\frac{(3.59-2X)^{2} }{(0.47+X)*X } =193[/tex]
When transformed, we get the following quadratic equation:
[tex]189X^{2} + 105.07X - 12.8881 = 0[/tex]
X = 0.1034
This means that we have 0.1034 moles of chlorine. We can use that to calculate the moles of hydrogen and HCl:
(0.47+0.1034) = 0.5734 moles of hydrogen;
(3.59 - 2*0.1034) = 3.3832 moles of HCl
The partial pressure of a gas (pX) in a gas mixture is equal to the molar percentage multiplied by the total pressure:
pX = P(total) * nₓ / n(total)
We can use this to calculate the partial pressures of all the gases present in the mixture:
pH₂ = 2 atm * 0.5734 mol / (0.1034 mol + 0.5374 mol + 3.3832 mol) = 0.2825 atm
pCl₂ = 2 atm * 0.1034 mol / (0.1034 mol + 0.5374 mol + 3.3832 mol) = 0.0509 atm
pHCl = 2 atm * 3.3832 mol / (0.1034 mol + 0.5374 mol + 3.3832 mol) = 1.6666 atm
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consider a closed vessel initially containing 1 mol of pure ethyl acetate at 74°c and 100 kpa. imagine that pure ethanol is slowly added at constant temperature and pres¬sure until the vessel contains 1 mol ethyl acetate and 9 mol ethanol. describe the evo¬lution of phases and phase compositions during this process. comment on the practical feasibility of carrying out such a process. what sort of device would be required? how would the total system volume change during this process? at what composition would the system volume reach its maximum value?
By ideal gas approximation, the volume change is 230.2 liters.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
n₁ = 1 mol
n₂ = 1 + 9 mol = 10 mol
P₁ = P₂ = 100 kPa = 100000 Pa
T₁ = 74⁰ C = 347 K
Find the initial volume
P₁ . V₁ = n₁ . R . T₁
100000 . V₁ = 1 . 8.31 . 347
V₁ = 0.0288 m³
When the initial and final temperature and pressure are the same, we can use the ratio of the number of moles and volume as
V₁ / n₁ = V₂ / n₂
0.0288 / 1 = V₂ / 9
V₂ = 0.25952 m³
V₂ = 259.52 liters
The volume change is
ΔV = V₂ - V₁
ΔV = 259.52 - 28.8
ΔV = 230.2 liters
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Question 8
Peter measured the height of a plant five times. He recorded the fol-
lowing results: 15.5 cm, 19.4 cm, 15.6 cm, 15.8 cm, 15.9 cm. Which of
the measurements is the least precise?
Peter measured the height of a plant five times the measurement that is the least precise is 19.4 cm,
This is further explained below.
What is a precise measurement?Generally, The accuracy of a material is defined as the degree to which two or more measurements agree with one another.
It is incredibly precise but not always accurate to measure something if you weigh it five times and get 3.2 kg each time. Accuracy is not necessary for precision.
In conclusion, Peter took five different readings of the height of a plant, and the one that is the least accurate is 19.4 centimeters.
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Carter went outside to check the mail one sunny summer day. since he was staying in his yard, he put on shorts, a t-shirt, but no shoes. as carter stepped outside, he felt the warmth of the sunshine on his skin. he walked down the sidewalk, but his feet got so hot he had to jump into the grass. he got the mail and began walking back to the house. before he went inside, he felt a breeze on his face. select the statement(s) that accurately identify the types of energy transfer in the scenario. his feet getting hot on the sidewalk is an example of conduction. the sidewalk getting hot from the sun is an example of radiation. the sunshine touching his face is an example of conduction. the breeze is an example of convection. the warmth of the sunshine on his skin is an example of radiation.
When Carter went outside one summer day to check the mail, the following statements accurately identify the types of energy transfer:
his feet getting hot is an example of conductionthe sidewalk getting hot from the sun is an example of radiationthe breeze is an example of convectionthe warmth of the sunlight on his skin is an example of radiation.Conduction, convection and radiation are all methods of heat transfer. Conduction is the transfer of heat between two solid bodies in contact. It occurs when two solid bodies of different bodies are in contact, and heat always flows from the hotter body to the colder body.
Convection occurs when heat is transferred by the flow of matter in a liquid or gas. Liquids and gases are normally poor conductors of heat, but they are able to transfer heat through convection as the molecules of the fluid carry the thermal energy as they move. Radiation is the transfer of heat in a vacuum. Unlike conduction and convection, radiation does not require a material medium, as heat is transferred by electromagnetic waves.
When carter stepped on the sidewalk, there was a temperature difference between his foot and the sidewalk. This enabled the transfer of heat from the sidewalk to his feet through conduction. The sidewalk, however, was hot because it had been exposed under the sun. Infrared red rays from the sun transfer heat by radiation to the surface of the earth, and the sidewalk absorbed some of this radiation.
Radiation is also absorbed by the wind and carried about by convection, just like the warm breeze carter felt on his face. Some radiation was absorbed by Carter's skin, which was the warmth he felt on his skin from the sunshine. The sunlight touching his face is not an example of conduction because conduction only occurs when two solid surfaces are in contact.
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In 1909, scientist ernest rutherford directed a stream of high speed alpha particles at a thin piece of gold foil. Some of the particles passed through, some were deflected, and some bounced straight back. This result caused rutherford to conclude that.
The result of the experiment caused Rutherford to conclude that the atom mostly was made of the empty spaces and had a positively charged nucleus in it.
Rutherford assaulted extremely thin sheets of gold foil with swiftly moving alpha (∝) particles, along with his colleagues Hans Geiger and Ernest Marsden. Positively charged alpha particles have a mass that is around four times that of a hydrogen atom.
The majority of the alpha-particles, they discovered, were undeflected, and only a small percentage were bounced off the gold foil at extremely enormous angles. Some were even sent back in the direction of the source.
Rutherford thought about these findings and came to the following conclusion: The fact that the majority of alpha particles passed straight through the foil is proof that the atom is primarily made up of empty space. It was determined that there is a concentration of positive charge in the atom based on the small number of alpha particles that were deflected at large angles.
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the rate constant for this second‑order reaction is 0.850 m−1⋅s−1 at 300 ∘c. a⟶products how long, in seconds, would it take for the concentration of a to decrease from 0.910 m to 0.340 m?
At 300 degrees Celsius, the rate constant for this alternative order response is 0.850 m1 s1.
Reaction and concentration.The adjectives "dilute" for results of relatively low attention and "concentrated" for results of comparatively strong focus are widely used when characterizing attention in informal, non-technical language. To concentrate a result, one must either increase the solute (such as alcohol) or decrease the detergent ( for illustration, water). To adulterate a result by disparity, one must either use more detergent or use less solute.
No more solute will dissolve after a certain point unless two substances are miscible. At this stage, the result is referred to as saturated. A product that has been impregnated with fresh solute will not dissolve, with the exception of certain circumstances.
When two or more motes meet with the proper exposure and force to create a new product, it is known as a chemical reaction. The links between the titles are broken and formed during this process. Reactants are composites that interact to make new composites, whereas products are composites that have just formed.
Situations, which might have a high or low value on the perpendicular axis of a graph and reflect the internal schema of situations, are usually referred to as attention ( for illustration," high serum situations of bilirubin" are attention of bilirubin in the blood serum that are lesser than normal).
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Two different samples of matter are measured in each of these glass containers. Both of the containers show the same measure for both samples of matter. The samples most likely have which of these in common?.
Two different samples of the matter are measured in each of these glass containers. Both of the containers show same measure for both samples of matter. The samples most likely have in common is their volume.
What is volume?Each thing in three dimensions takes up some space. The volume of this area is what is being measured. The space occupied within an object's borders in the three dimensions is referred to as its volume. It is sometimes referred to as object's capacity.
Volume is a measurement of the three-dimensional space that is occupied.
Numerous imperial units or the SI-derived units, such as the cubic meter and liter, are frequently used to quantify it numerically (such as the gallon, quart, cubic inch). Volume and length (cubed) have symbiotic relationship. The volume of container is typically thought of as its capacity, not as the amount of space it takes up. In other words, volume is the amount of fluid (liquid or gas) that the container may hold.
Volume was initially measured using naturally occurring containers of a similar shape and later with the standardized containers. Arithmetic formulas can be used to quickly calculate volume of some straightforward three-dimensional shapes. If a formula for shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes. No object in dimensions of zero, one, or two has volume; in the dimensions of four and higher, the hypervolume is a concept similar to the normal volume.
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Draw the structure of an alkene of five carbons that would give the same product as a result of either oxymercuration‑reduction or hydroboration‑oxidation.
Here hydroboration-oxidation, as well as oxymercuration-reduction, gives the same compound 1-cyclo pentanol.
A compound in linguistics is a lexeme (more precisely, a word or sign) composed of more than one stem. The process of word construction that results in compound lexemes is known as compounding, composition, or nominal composition. An open compound or a spaced compound is one that uses a space rather than a hyphen or concatenation; the alternative is a closed compound.
The compound's meaning may be comparable to or distinct from the meanings of its constituents in isolation. With very few exceptions, the first component stem in English compound words is emphasized.
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When you see iron (II) that means iron with 2 valence electrons, so what will the
charge be?
2+
Explanation:Ions are separated into cations and anions.
Oxidation State
The roman numeral after iron represents the oxidation state. The oxidation state shows the hypothetical charge of an atom. Since iron can have different oxidation states, it needs to be noted using a roman numeral. Iron can either be iron (II) or iron (III), which have a 2+ and 3+ charge, respectively.
Cations
Ions are atoms that have negative or positive charges. Negative ions are called anions, and positive ions are called cations. Atoms that have almost full valence shells (5-7 valence electrons) take electrons and become anions. Atoms that have almost empty valence shells (1-3 valence electrons) lose electrons and become cations.
Iron (II) has 2 valence shell electrons, so it will be a cation. When it bonds, it will lose both valence electrons. Since atoms gain a 1+ charge for every electron it loses, iron (II) will have a 2+ charge.
PLEASE HELP!!! which of these atoms are isotopes??
Explain how dissolution occurs using the collision theory to help you explain.
PLS HELP WILL MARK BRAINLIEST!!
Carbon disulfide gas and oxygen gas react to form sulfur dioxide gas and carbon dioxide gas. What volume of carbon dioxide would be produced by this reactionif 1.1 L of carbon disulfide were consumed?Also, be sure your answer has a unit symbol, and is rounded to 2 significant digits.08 0 0.20.0X
Answer: Based on the stoichiometry 1 mole of carbon disulfide will produce 1 mole of carbon dioxide. Similarly we can apply the volume ratio, so 1.1L of carbon disulfide will produce 1.1L of carbon dioxide.
Measure it with sig figs
The measurement is 3 inches.
What does measuring mean?The attributes of an object or an event are measured and quantified so that they can be compared to other things or events. Therefore, measurement is the process of determining the size or smallness of a physical quantity in comparison to a primary reference quantity of a similar kind.
The range and applications of measurement depend on the situation and industry. Measurements do not apply to nominal attributes of things or occurrences in the natural sciences and engineering, as stated in the International Vocabulary of Metrology published by the International Bureau of Weights and Measures.
However, measures in a number of fields, such as statistics and the social and behavioral sciences, might comprise more than one level.
The specified length is 3 inches.
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