Classifying Chemical Reactions

Multiple Choice

Which of the following best describes a chemical reaction?

• A process in which substances are mixed but do not change

• A change in which one or more substances are converted into new substances

• A physical change where no new substances are formed

• A process that only occurs in laboratories

Open Ended

Why is the conservation of mass important in chemical reactions?

Multiple Choice

Which law did Antoine Lavoisier establish regarding the mass of reactants and products in a chemical reaction?

• Law of Conservation of Mass

• Law of Definite Proportions

• Law of Multiple Proportions

• Law of Constant Composition

Multiple Choice

Which of the following is an example of a decomposition reaction?

• 2H2O → 2H2 + O2

• C + O2 → CO2

• CH4 + 2O2 → CO2 + 2H2O

• Na + Cl2 → 2NaCl

Open Ended

Explain the role of reactivity in predicting the outcome of a single displacement reaction.

Multiple Select

Select all the correct statements about single and double displacement reactions.

• Single displacement involves one element replacing another in a compound.

• Double displacement involves exchange of ions between two compounds.

• Single displacement always produces a precipitate.

• Double displacement can form a gas, water, or precipitate.

Open Ended

Explain how oxidation and reduction are related in a redox reaction. Provide an example based on the diagrams shown.

Multiple Choice

Which of the following best describes oxidation in a chemical reaction?

• Loss of electrons

• Gain of electrons

• Loss of protons

• Gain of neutrons

Multiple Select

Which of the following statements about the removal and addition of oxygen in redox reactions are correct?

• Removal of oxygen is reduction

• Addition of oxygen is oxidation

• Addition of oxygen is reduction

• Removal of oxygen is oxidation

Open Ended

Reflecting on today's lesson about chemical reactions, what is one thing you learned that you found interesting or surprising?