Balancing Equations Review

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 during the reaction.

Front

What are reactants in a chemical equation?

Back

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

Front

What are products in a chemical equation?

Back

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

Front

What does the law of conservation of mass state?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

How do you determine the number of atoms in a molecule?

Back

The number of atoms in a molecule can be determined by adding the subscripts of each element in the chemical formula.

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 in the reaction.

Front

How many oxygen atoms are in 3O₂?

Back

There are 6 oxygen atoms in 3O₂ (3 x 2 = 6).

Front

What is the purpose of balancing a chemical equation?

Back

The purpose of balancing a chemical equation is to ensure that the same number of each type of atom is present on both sides, reflecting the conservation of mass.

Front

What is the balanced equation for the reaction of magnesium chloride and magnesium?

Back

4MgCl₂ --> Mg₄ + 4Cl₂.

Front

How many hydrogen atoms are in 4H₂O?

Back

There are 8 hydrogen atoms in 4H₂O (4 x 2 = 8).