Atoms First 2e - Writing and Balancing Chemical Equations Quiz

In a chemical reaction, what are the substances that are initially combined called?

• Reactants

• Products

• Catalysts

• Inhibitors

While writing a recipe for a chemical potion in a magical cookbook, what symbol is used to separate different ingredients?

• Minus sign (-)

• Multiplication sign (×)

• Plus sign (+)

• Division sign (÷)

What must be true for a recipe to adhere to the principle of 'what goes in must come out' in terms of ingredients?

• Equal numbers of compounds for each ingredient used in the recipe

• Equal numbers of molecules for each ingredient used in the recipe

• Equal numbers of ions for each ingredient used in the recipe

• Equal numbers of atoms for each ingredient involved in the recipe

Tags

NGSS.HS-PS1-7

While writing a balanced chemical equation, what is the smallest whole-number coefficient that can be used?

• 3

• 1

• 0

• 2

Tags

NGSS.HS-PS1-7

Imagine you are conducting an experiment in a lab to observe the reaction between methane and oxygen, which results in the formation of carbon dioxide and water. Refer to this guide for help. What is the balanced chemical equation for this reaction?

• 2CH4 + 3O2 ⟶ 2CO2 + 3H2O

• CH4 + O2 ⟶ CO2 + H2O

• CH4 + 2O2 ⟶ CO2 + 2H2O

• 3CH4 + 4O2 ⟶ 3CO2 + 4H2O

Tags

NGSS.HS-PS1-7

Imagine you are in a chemistry lab tasked with demonstrating the decomposition of water into its elemental components. Which of the following equations correctly represents the balanced chemical reaction you would need to achieve this?

• 2H2O ⟶ H2 + 2O2

• 2H2O ⟶ 2H2 + O2

• H2O ⟶ H2 + O2

• 3H2O ⟶ 3H2 + O2

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Imagine you are in a chemistry lab tasked with demonstrating the reaction between molecular nitrogen (N₂) and oxygen (O₂) to produce dinitrogen pentoxide. What is the balanced equation for this chemical reaction?

For guidance, you can refer to Chemistry: Atoms First.

• 4N₂ + 9O₂ ⟶ 4N₂O₅

• 3N₂ + 7O₂ ⟶ 3N₂O₅

• 2N₂ + 5O₂ ⟶ 2N₂O₅

• N₂ + O₂ ⟶ N₂O₅

While working in a lab, you are tasked with the decomposition of ammonium nitrate to produce molecular nitrogen, molecular oxygen, and water. What is the balanced chemical equation for this reaction?

For assistance, Copy & go to https://openstax.org/books/chemistry-atoms-first-2e/pages/7-1-writing-and-balancing-chemical-equations

• NH4NO3 ⟶ N2 + O2 + H2O

• 2NH4NO3 ⟶ 2N2 + O2 + 2H2O

• 3NH4NO3 ⟶ 3N2 + O2 + 3H2O

• 4NH4NO3 ⟶ 4N2 + O2 + 4H2O

Tags

NGSS.HS-PS1-7

Imagine you are in a chemistry lab, tasked with demonstrating the combustion of ethane (C2H6) in the presence of oxygen to produce water (H2O) and carbon dioxide (CO2). What is the balanced chemical equation for this reaction?

For guidance, you may refer to Chemistry: Atoms First.

• 3C2H6 + 4O2 ⟶ 4H2O + 3CO2

• 2C2H6 + 7O2 ⟶ 6H2O + 4CO2

• C2H6 + O2 ⟶ H2O + CO2

• 4C2H6 + 5O2 ⟶ 5H2O + 4CO2

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

When methane gas combines with oxygen in the air, what is the ratio of methane and oxygen molecules to the produced carbon dioxide and water molecules?

For more information, you can refer to the chemical equations section at Chemistry: Atoms First.

• 2:3:2:3

• 1:2:1:2

• 1:1:1:1

• 3:4:3:4