Chemical Reactions

Front

What is a chemical reaction?

Back

A process in which substances (reactants) undergo a transformation to form new substances (products).

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances with different properties.

Front

What are reactants in a chemical reaction?

Back

Substances that undergo change during a chemical reaction.

Front

What are products in a chemical reaction?

Back

Substances that are formed as a result of a chemical reaction.

Front

Can atoms be created or destroyed in a chemical reaction?

Back

No, according to the law of conservation of mass, atoms cannot be created or destroyed in a chemical reaction.

Front

What is an example of a physical change?

Back

Dissolving salt in water.

Front

What is an example of a chemical change?

Back

The reaction that occurs in a glow stick.

Front

What is the role of water in a chemical reaction?

Back

Water can act as a reactant or a product, depending on the reaction.

Front

How do you determine the number of molecules in a chemical equation?

Back

By looking at the coefficients in front of the chemical formulas in the equation.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in the reaction.