Chemical Reactions Quiz

Which of the following is a balanced chemical equation?

• N₂ + 3H₂ → 2NH₃

• 2Na + Cl₂ → 2NaCl

• C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

• All of the above are balanced chemical equations.

How many moles of ammonia are produced by the following reaction? N₂ + 3H₂ → 2 NH3

• 1

• 2

• 3

• 6

Which of the following are evidences of a chemical change?

• A precipitate forms.

• Bubbles form.

• A change in color occurs.

• A change in phase from a liquid to a gas occurs.

• A change in temperature occurs.

What kind of reaction occurs when water breaks up into hydrogen and oxygen gas?

• decomposition

• double-replacement

• single-replacement

• synthesis

What kind of reaction is BaCl₂ + K₂CO₃ → BaCO₃ + 2KCl?

• decomposition

• double-replacement

• single-replacement

• synthesis

What is oxidation?

• any reaction that burns

• any reaction where electrons are lost

• fuel reacting with oxygen

• reactions between metals and oxygen

Chemical reactions that give off heat are called __________ reactions.

• catalytic

• conservation

• endothermic

• exothermic

The law of conservation of energy states that ________. Energy can only be changed from one form to another.

Which of the following is NOT part of the collision model for affecting reaction rates?

• Catalysts must be present to increase the reaction rate.

• Enough energy must be present.

• Reactant particles must be aligned properly.

• Reactant particles must collide.

Which of the following would most likely increase the reaction rate of a chemical reaction?

• dividing a large reactant into smaller pieces

• lowering the temperature

• preventing any stirring from occurring

• reducing the concentration of the reactants