Chemical reactions grade 7

Front

What is a chemical reaction?

Back

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

Front

What are reactants in a chemical equation?

Back

The substances that undergo a chemical change, found on the left side of a chemical equation.

Front

What are products in a chemical equation?

Back

The new substances formed as a result of a chemical reaction, found on the right side of a chemical equation.

Front

What does the principle of conservation of mass state?

Back

Matter is not created or destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a coefficient in a chemical equation?

Back

A number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

Front

How do you balance a chemical equation?

Back

By adjusting the coefficients of the reactants and products to ensure the same number of each type of atom on both sides of the equation.

Front

What is the chemical formula for hydrochloric acid?

Back

HCl

Front

What is the chemical formula for magnesium oxide?

Back

MgO

Front

What is the state of matter for MgO produced in the reaction 2Mg + O2 -> 2MgO?

Back

White powder.

Front

What does it mean if a reaction is exothermic?

Back

It releases energy, usually in the form of heat, to the surroundings.