Chemical Reactions Review 2024

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that the mass of a system (reaction) stays the same from beginning to end.

Front

What are reactants in a chemical reaction?

Back

Reactants are the substances that undergo a chemical change in a reaction. For example, in the reaction of O2 and CH4, these are the reactants.

Front

How many Oxygen (O) atoms are in one molecule of C2HO8Cl2?

Back

There are 8 Oxygen (O) atoms in one molecule of C2HO8Cl2.

Front

What is 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. Example: A glass falling and shattering.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Example: Baking a birthday cake.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not change the substance's chemical identity, while a chemical change results in new substances being formed.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What are products in a chemical reaction?

Back

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

Front

What is an example of a chemical reaction?

Back

An example of a chemical reaction is the reaction between baking soda and vinegar, which produces carbon dioxide gas.

Front

What does it mean for a reaction to be balanced?

Back

A balanced reaction means that the number of atoms for each element is the same on both the reactant and product sides.