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Chemistry High School

Most water vapor enters earths atmosphere by the process of

Most water vapor enters earths atmosphere by the process of

2 months ago

Solution 1

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2 months ago

Sublimation;When anything solid turns into a gas without first becoming liquid, When the surface layer of snow or ice turns into fog or steam without melting,

📚 Related Questions

Question

If the pressure of the gas in a 2.31 L balloon is 0.12 ATM and the volume increases to 7.14 L what will be the final pressure of the air within the balloon? Assume the temperature remains constant

Solution 1

We can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

P1V1 =P2V2

P2 = P1 x V1 / V2

P2 = 0.12 x 2.31 / 7.14

P2 = 0.04 atm

Solution 2

Answer: 0.04 atm

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto \frac{1}{V}$ (At constant temperature and number of moles)

$P_1V_1=P_2V_2$

where,

$P_1$ = initial pressure of gas = 0.12 atm

$P_2$ = final pressure of gas = ?

$V_1$ = initial volume of gas = $2.31 L$

$V_2$ = final volume of gas = 7.14 L

$0.12\times 2.31=P_2\times 7.14$

$P_2=0.04atm$

Therefore, the final pressure of the air within the balloon is 0.04 atm.

Question

An industrial chemist is studying a sample of an unknown metal. Describe two ways he could change the metal physically and two ways he could change the metal chemically to try to identify it.

Solution 1

Answer:

Some of the physical changes used by the industrial chemist in order to identify it is by scratching it with other metals in order to find the hardness of it. Trying to deform it in order to find the malleability, and to heat it and measure the temperature in order to find the melting point.

Some of the chemical changes used by the industrial chemist in order to identify it is by inserting it in water to observe that whether it reacts with it or not, if the reaction is violent, then the metal belongs to either group I or group II. The other method is to insert it in acids of distinct strength and to observe its reaction. The metals belonging to the second group react briskly with acids. The other metals react gradually with acids and others are almost inert.

Solution 2

Answer:

Some of the physical changes used by the industrial chemist in order to identify it is by scratching it with other metals in order to find the hardness of it. Trying to deform it in order to find the malleability, and to heat it and measure the temperature in order to find the melting point.

Some of the chemical changes used by the industrial chemist in order to identify it is by inserting it in water to observe that whether it reacts with it or not, if the reaction is violent, then the metal belongs to either group I or group II. The other method is to insert it in acids of distinct strength and to observe its reaction. The metals belonging to the second group react briskly with acids. The other metals react gradually with acids and others are almost inert.

Explanation:

Question

The vapor pressure of ethanol at 25°C is 7.828 kPa . Calculate the vapor pressure in atm .

Solution 1

First you get 7.83 kPa = 7.83 * 10^4 Pa Then convert it to atm by using the relation 1 Pa = 9.8692 * 10^-6 atm, this gives you 7.83 kPa = 7.83 * 10^4 * 9.8692 * 10^-6 atm = 77.275836 * 10^-2 atm = 0.77275836 atm Now round to three significant digits, = 0.773 atm

Question

What happens when you swallow acid

Solution 1

Some of the symptoms from swallowing hydrochloric acid:

-Abdominal pain
-Breathing difficulty due to swelling of throat
-Chest pain
-Drooling
-Fever
-Mouth pain
-Rapid drop in blood pressure
-Throat pain
-Vomiting blood

Solution 2

It would depend on the type of acid.. If you were to swallow Hydrochloric Acid you would likely have very bad pain in your abdominal, difficulty breathing, bad chest pain, fever, bad pain in your mouth, pain in your throat, and it's also possible to be vomiting blood.

Question

What is the product of the following chemical equation? C3H8(g) + 5O2(g) →

Solution 1

Answer: $CO_2$ and $H_2O$

Explanation:

When a hydrocarbon burns in the presence of oxygen, it forms carbon dioxide and water and this a an example of combustion reaction.

$C _3H_8+5O_2\rightarrow 3CO_2+4H_2O$

Reactants of a chemical reaction is defined as the substances which take part in a chemical reaction and undergoes a chemical change. Reactants are written on left side of the arrow.

Products are defined as the substance which are formed at the end of the chemical reaction.Products are written on the right side of the arrow.

Thus the products are carbon dioxide and water.

Solution 2

Carbon Dioxide and Water

Question

Phenylacetic acid, HC8H7O2 is one of the substances that accumulates in the blood of persons with phenylketonuria, an inherited disorder that can cause death. A 0.085 M solution of HC8H7O2 is found to have a pH of 2.68. Calculate the Ka value for this acid.

Solution 1

A 0.085 M solution of HC₈H₇O₂ is found to have a pH of 2.68. The Ka value for this acid is 0.00005262.

What is phenylacetic acid?

Phenylacetic acid is an inorganic compound that contains two functional groups, one is carboxylic acid and phenol group.

pH is the value of measurement of acidity and the basicity of any liquid. It is potential hydrogen. It is the measurement of the acidity and basicity of any solution.

The acid dissociation constant is the equilibrium constant of an acid's dissociation reaction. It is denoted by ka.

Given, that 0.085 M solution of HC₈H₇O₂. The pH is 2.68.

Ka = [H+][PAc-] / [PAcH]

[H+] = 10⁻²·⁶⁸ = 0.00209M = [PAc-]

[PAcH] = 0.085 = 0.00209 = 0.083

Ka = (.00209)(.00209) / (0.083) = 0.00005262

Thus, the Ka value for this acid is 0.00005262.

To learn more about phenylacetic acid, refer to the link:

brainly.com/question/9788009

#SPJ2

Solution 2

Ka = [H+][PAc-] / [PAcH]

[H+] = 10^-2.68 = 0.00209M = [PAc-]
[PAcH] = 0.085 = 0.00209 = 0.083

Ka = (.00209)(.00209) / (0.083) = Answer Here.

Question

What two factors determine a molecule is polar or not

Solution 1

The two factors that determine whether or not a molecule is polar are if the individual bonds are even and the shape of the molecule. If the molecule is perfectly symmetric, the molecule will not be polar even if there are polar bonds present.

Question

The chemical formula of propane is C3H8. Which number correctly uses scientific notation to represent the number of atoms in 2.00 moles of propane?

Solution 1

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We do as follows:

2.00 mol C3H8 ( 6.022 x 10^23 atoms / mole ) = 1.204x10^24 atoms C3H8

Solution 2

Answer:

1.2046*10²⁴ atoms

Explanation:

Avogadro's Number or Avogadro's Constant to the number of particles that constitute a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023 * 10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without dimension or explicit unit of expression. The Avogadro number applies to any substance.

Then a rule of three applies as follows: if 1 mole has 6,023 * 10²³ atoms, 2 moles how many atoms will it contain?

$number of atoms=\frac{2 moles*6.023*10^{23} }{1mole}$

number of atoms=1.2046*10²⁴ atoms

This number is already represented in scientific notation.

Question

Use the mole concept to calculate the number of atoms that are in a 1.75-mol sample of CHCl3.

Solution 1

This is how I got to that answer. Since we don't know how many atoms there are in a mole, we use the number 6.02 x 10^-23. Now, just plug in what you have in the equation:

1.75 moles ChCl3 x (6.02 x 10 ^-23) / 1 mole = 1.0535 x 10^-22 atoms.

Question

True or false It is very efficient to drive a large truck to and from school.

Solution 1

The answer is false, for sure.

Solution 2

Answer:

false

Explanation:

think of all of the gas money you have to spend

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