Chemical reactions grade 7

Front

What is a chemical reaction?

Back

A process where substances (reactants) transform into new substances (products) through the breaking and forming of chemical bonds.

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

New substances formed as a result of a chemical reaction.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it remains constant.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What is a compound?

Back

A substance formed when two or more different elements chemically bond together.

Front

How many atoms are in a molecule of water (H2O)?

Back

3 atoms (2 hydrogen and 1 oxygen).

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms.

Front

What does the coefficient in a chemical equation represent?

Back

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