Balancing Chemical Equations Practice

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 a chemical reaction.

Front

What does the coefficient in a chemical equation represent?

Back

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

Front

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

Back

Multiply the subscript of each element by the coefficient in front of the compound. For example, in 3Cr(MnO4)6, there are 3 x 6 = 18 Mn atoms.

Front

What is the law of conservation of mass?

Back

The law states that mass is neither created nor destroyed in a chemical reaction; therefore, the total mass of reactants must equal the total mass of products.

Front

How do you balance a chemical equation?

Back

Adjust the coefficients of the reactants and products to ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the balanced equation for the reaction of hydrogen and nitrogen to form ammonia?

Back

3 H2 + N2 -> 2 NH3.

Front

What is the balanced equation for the combustion of sodium chlorate (NaClO3)?

Back

2 NaClO3 -> 2 NaCl + 3 O2.

Front

What is the balanced equation for the reaction of aluminum bromide and chlorine?

Back

2 AlBr3 + 3 Cl2 -> 2 AlCl3 + 3 Br2.

Front

What is a subscript in a chemical formula?

Back

A subscript indicates the number of atoms of an element in a molecule. For example, in H2O, the '2' is a subscript indicating there are two hydrogen atoms.

Front

What is the significance of the arrow in a chemical equation?

Back

The arrow indicates the direction of the reaction, showing the conversion of reactants to products.