Stoichiometry and Kinetic Molecular Theory Practice Quiz

Consider the balanced chemical equation below:

4NH₃ + 7O₂ → 4NO₂ + 6H₂O

What is the mole ratio of O₂ to H₂O in this reaction?

• 7:4

• 4:6

• 7:6

• 6:7

Tags

NGSS.HS-PS1-7

For the following chemical equation:

CH₄ + 2O₂ → CO₂ + 2H₂O

If 4.50 moles of methane (CH₄) react completely with oxygen gas, how many moles of water (H₂O) are formed?

• 2.25 moles

• 4.50 moles

• 6.75 moles

• 9.00 moles

Tags

NGSS.HS-PS1-7

Which conversion factor is responsible for converting the amount of matter to the amount of moles in a stoichiometric problem?

• Mole-to-mole ratio

• Molar mass

• Molar volume

• Metric standards

Which conversion factor is used to convert moles of a gas to volume at STP in a stoichiometric problem?

• 1 mole/22.4 L

• 1 mole/6.022 x 10²³ particles

• mole A/mole B

• 1 mole/molar mass

Which conversion factor is responsible for converting one substance to another substance in a stoichiometric problem?

• Molar mass

• Avogadro's number

• Mole ratio from the balanced chemical equation

• Density

Which of the following statements describes the difference in the limiting and excess reactant?

• The excess reactant is completely used in the chemical reaction, while the limiting reactant is left over.

• The limiting reactant is left over after the chemical reaction has run to completion.

• The excess reactant determines how much of the limiting reactant is used in the chemical reaction.

• The limiting reactant is completely used in the chemical reaction, while the excess reactant is left over.

If the volume of a gas is decreased while keeping the temperature constant, what happens to the pressure of the gas?

• The pressure decreases.

• The pressure remains the same.

• The pressure increases.

• The pressure depends on the type of gas.

Which state(s) of matter is/are able to be compressed?

• Liquids

• Solids

• Gases

• Liquids and Gases

What phase change is being demonstrated by the dry ice (the solid form of carbon dioxide) in the visual?

• Condensation

• Sublimation

• Vaporization

• Melting

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What does the enthalpy of fusion describe?

• The enthalpy of fusion describes how much energy must be removed from one mole of a substance for freezing to occur.

• The enthalpy of fusion describes how much energy must be added to one mole of a substance for freezing to occur.

• The enthalpy of fusion describes the amount of energy that must be removed from one mole of a substance for boiling to occur.

• The enthalpy of fusion describes the amount of energy that must be added to one mole of a substance for boiling to occur.