Balancing Chemical Equations

Front

What is a coefficient in a chemical equation?

Back

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

Front

How many molecules of water are represented in 3H₂O?

Back

3 molecules of water.

Front

What does NaCl represent in chemistry?

Back

NaCl represents sodium chloride, commonly known as table salt.

Front

How many sodium (Na) atoms are in 3NaCl?

Back

3 sodium atoms.

Front

What is the formula for phosphate?

Back

The formula for phosphate is PO₄.

Front

How many phosphorus atoms are in PO₄?

Back

1 phosphorus atom.

Front

What does it mean for a chemical equation to be balanced?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Front

Is the equation SO₃ + H₂O → H₂SO₄ balanced?

Back

Yes, it is balanced.

Front

What are the reactants in a chemical equation?

Back

Reactants are the substances that undergo a chemical change in a reaction.

Front

In the equation Fe + S → FeS, what are the reactants?

Back

Fe (iron) and S (sulfur) are the reactants.