Preap Chemical Reactions and Balancing Equations

SO₂ + O₂ → SO₃

The unbalanced equation representing a chemical reaction is shown.

Which of the following particle models represents the balanced chemical equation?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-7

C₂H₅OH(l)+3O₂(g)→2CO₂(g)+3H₂O(g)

If 9.2g of C2H5OH(l) burns completely in the presence of excess O2(g) according to the equation, how many grams of CO2(g) are produced?

• 0.40g

• 8.8g

• 9.2g

• 18g

The contents of two vessels are combined, as shown. The balanced chemical equation for the reaction that occurs is also shown. Which of the following represents the contents of the reaction vessel after the N₂ and Cl₂ react as completely as possible?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

2CO(g)+O2(g)→2CO2(g) A 112g sample of CO(g) is combined with a 32g sample of O2(g) and the reaction represented proceeds as completely as possible. Which TWO of the following statements are correct?

• CO(g) is the limiting reactant.

• O2(g) is the limiting reactant.

• 4 mol of CO(g) reacts.

• 2 mol of CO(g) remains unreacted.

• 144g of CO2(g) is produced.

Tags

NGSS.HS-PS1-7

2NO+O₂→2NO₂

The balanced equation for a reaction is shown. The reactants are placed in a container, and the reaction occurs. The contents of the container after the reaction has proceeded as completely as possible are represented in the diagram.

Which of the following diagrams represents the original contents of the container?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-7

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?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

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

2 H₂(g)+CO(g)→CH₃OH(l)

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

• 44%

• 50.%

• 56%

• 100%

CH₄(g)+2O₂₍g)→CO₂(g)+2H₂O(g) When CH₄(g) is burned in O2(g) , the reaction represented by the equation occurs.

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?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

CH₄(g)+2O₂(g)→CO₂(g)+2H₂O(g) When CH4(g) is burned in O2(g) , the reaction represented by the equation occurs. If 32g of CH4 is burned completely, how many moles of CO2 are produced?

• 2 mol

• 3 mol

• 4 mol

• 5 mol

2H₂S(g)+3O₂(g)→2SO₂(g)+2H₂O(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) ?

• 0.80mol

• 1.2mol

• 1.8mol

• 3.0mol