Balancing Chemical Equations Practice

Front

What does the Law of Conservation of Mass state?

Back

Matter cannot be gained or lost in a chemical reaction.

Front

What are the coefficients needed to balance the equation: _Al + _HCl -> _H2 + _AlCl3?

Back

2, 6, 3, 2

Front

How many Mn atoms are in the compound 3Cr(MnO4)6?

Back

18

Front

Which of the following equations is correctly balanced? 6CO2 + 6H2O -> C6H12O6 + 6O2

Back

6CO2 + 6H2O -> C6H12O6 + 6O2

Front

What is a balanced chemical equation?

Back

A chemical equation where the number of atoms for each element is the same on both sides.

Front

What is the purpose of balancing chemical equations?

Back

To ensure that the Law of Conservation of Mass is upheld.

Front

What does a coefficient in a chemical equation represent?

Back

The number of molecules or moles of a substance.

Front

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

Back

Multiply the subscript of each element by the coefficient.

Front

What is the balanced equation for the combustion of propane (C3H8)?

Back

C3H8 + 5O2 -> 3CO2 + 4H2O

Front

What is the significance of subscripts in a chemical formula?

Back

They indicate the number of atoms of each element in a molecule.