PAP Balancing and Stoichiometry checkpoint review

The unbalanced equation representing a chemical reaction is shown: SO₂ + O₂ → SO₃. Which of the following particle models represents the balanced chemical equation?

• Option A

• Option B

• Option C

• Option D

Tags

NGSS.HS-PS1-7

When CH₄(g) reacts with O₂(g) in a combustion reaction, CO₂(g) and H₂O(g) are formed according to the equation given. A 32 g sample of CH₄(g) reacts with excess O₂(g). Assuming that the reaction goes to completion, what is the total mass of CO₂(g) and H₂O(g) produced?

• 44 g

• 62 g

• 80 g

• 160 g

Tags

NGSS.HS-PS1-7

Which of the following best represents the reaction system after the reaction is complete?

2 CO + O₂ --> 2CO₂

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Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

The model shows a particulate representation of a reactant mixture of CO(g) and O₂(g). If this mixture is ignited, the following reaction occurs: 2 CO(g) + O₂(g) → 2 CO₂(g). Which of the following claims about the reactant mixture is correct?

• O₂ is the limiting reactant because its molar mass is greater than the molar mass of CO.

• CO is the limiting reactant because its molar mass is less than the molar mass of O₂.

• O₂ is the limiting reactant because of the number of O₂ molecules in the model is less and than the stoichiometric ratio of O₂ to CO in the balanced chemical equation.

• CO is the limiting reactant because of the number of CO molecules in the model is less and than the stoichiometric ratio of O₂ to CO in the balanced chemical equation.

Tags

NGSS.HS-PS1-7

Two students draw particulate diagrams to represent the reaction shown in the following equation: H₂(g) + Cl₂(g) → 2 HCl(g). Both students have errors in their diagrams. Which of the following correctly identifies one of the errors in a student’s diagram?

• Diagram 1 does not show the excess reactant H₂ in the After part of the diagram.

• Diagram 1 does not show the excess reactant Cl₂ in the After part of the diagram.

• Diagram 2 does not correctly represent the bonding in the reactants.

• Diagram 2 shows the reactant and product molecules as gases.

Tags

NGSS.HS-PS1-2

NH₃(g) reacts with O₂(g) to form NO(g) and H₂O(g). The amounts of reactants shown are combined in a container. Which of the following represents the contents of the container after the NH₃(g) and O₂(g) react as completely as possible?

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Tags

NGSS.HS-PS1-7

A 4 g sample of H₂(g) is combined with a 28 g sample of CO(g), and the following reaction occurs:

2 H₂(g) + CO(g) → CH₃OH(l).

If 14 g of CH₃OH(l) is produced, the percent yield would be closest to which of the following?

• 44%

• 50%

• 56%

• 100%

Tags

NGSS.HS-PS1-7

A particle representation of the reactants is shown. Which of the following shows the correct number of molecules of each product, given the amounts of reactants shown?

CH₄ + 2 O₂ --> CO₂ + 2 H₂O

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Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-2

If 32 g of CH₄ is burned completely, how many moles of H₂O are produced?

CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)

• 2 mol

• 4 mol

• 8 mol

• 64 mol

2 H₂S(g) + 3 O₂(g) → 2 SO₂(g) + 2 H₂O(g)

A 1.2mol sample of H₂S(g) is combined with excess O₂(g), and the reaction goes to completion.

How many moles of O₂(g) react with the available H₂S(g)?

• 0.80 mol

• 1.2 mol

• 1.8 mol

• 3.0 mol

Tags

NGSS.HS-PS1-7