Chemistry Review 2025

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; it remains constant.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, resulting in a change in chemical composition.

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.

Front

How many atoms are in the chemical formula 2Mg(ClO3)2?

Back

18 atoms.

Front

What are compounds?

Back

Compounds are substances made of two or more types of atoms chemically bonded together.

Front

How many atoms are in the chemical formula 3H2O2?

Back

12 atoms.

Front

What are reactants in a chemical equation?

Back

Reactants are the starting substances that undergo a chemical change in a reaction.

Front

What are products in a chemical equation?

Back

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

Front

What is a chemical equation?

Back

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

Front

What does the arrow (→) in a chemical equation represent?

Back

The arrow represents the direction of the reaction, indicating that reactants are transformed into products.