Review: Physical Changes & Chemical Reactions

Front

An example of a physical change is ___

Back

Shredding paper is a physical change because it alters the form of the paper without changing its chemical composition.

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.

Front

The number of atoms of N (nitrogen) in 3N2O5 is ___

Back

There are 6 nitrogen atoms in 3N2O5 because each molecule of N2O5 contains 2 nitrogen atoms, and there are 3 molecules.

Front

What is the difference between a reactant and a product in a chemical reaction?

Back

Reactants are substances that participate in a chemical reaction, while products are substances that are formed as a result of the reaction.

Front

What are the starting materials in a chemical reaction called?

Back

The starting materials in a chemical reaction are called reactants.

Front

Define a physical change.

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

Give an example of a chemical change.

Back

An example of a chemical change is burning wood, which transforms it into ash and gases.

Front

What is a catalyst?

Back

A catalyst is a substance that speeds up a chemical reaction without being consumed in the process.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What are products in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction.