Chemical reactions grade 7

Front

What are reactants in a chemical reaction?

Back

Reactants are the substances that undergo a chemical change in a reaction. They are found on the left side of a chemical equation.

Front

What are products in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction. They are found on the right side of a chemical equation.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved.

Front

How do you balance the equation Fe + O2 -> Fe2O3?

Back

The balanced equation is 4Fe + 3O2 -> 2Fe2O3.

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 is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula in an equation to indicate how many molecules or moles of that substance are involved.

Front

What is the difference between an atom and a molecule?

Back

An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

Front

How many aluminum atoms are in Al2O3?

Back

There are 2 aluminum atoms in Al2O3.

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 it mean to say a reaction is exothermic?

Back

An exothermic reaction is one that releases energy, usually in the form of heat, to the surroundings.