BMST - Basic Math and Science Chemical Reactions and Stoichiometry Questions and Answers 4

Question 1

What does a catalyst do in a chemical reaction?

Accepted Answer

Lowers the activation energy without being consumed

Answer

A catalyst lowers the activation energy of a reaction and is not consumed in the process.

Question 2

In the equation N₂ + 3H₂ → 2NH₃, what is the mole ratio of H₂ to NH₃?

Accepted Answer

3:2

Answer

The coefficients show 3 moles of H₂ produce 2 moles of NH₃, giving a ratio of 3:2.

Question 3

Which term describes the minimum amount of reactant needed to produce a specific amount of product?

Accepted Answer

Limiting reagent

Answer

The limiting reagent is the reactant that is completely consumed first and determines the maximum amount of product.

Question 4

The reaction CaCO₃ → CaO + CO₂ is best classified as which type?

Accepted Answer

Decomposition

Answer

One compound breaking into two simpler substances is the definition of a decomposition reaction.

Question 5

What is the percent yield if the theoretical yield is 50 g and the actual yield is 40 g?

Accepted Answer

80%

Answer

Percent yield = (actual yield / theoretical yield) × 100 = (40/50) × 100 = 80%.

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