Balancing Equations 1

What does the law of conservation of mass state about atoms in a chemical reaction?

• Atoms are transferred to another dimension

• Atoms are destroyed and created

• Atoms are neither created nor destroyed

• Atoms multiply during reactions

What must be done to balance a chemical equation?

• Change the subscripts in the compounds

• Add catalysts to the reaction

• Use only even numbers in equations

• Adjust the coefficients before the molecules

In the formula 3O₂, what does the subscript '2' indicate?

• There are two molecules of oxygen

• The oxygen is doubled

• There are three molecules of oxygen

• Each molecule has two oxygen atoms

How many sodium atoms are there in two molecules of Na2O?

• Four sodium atoms

• Eight sodium atoms

• Six sodium atoms

• Two sodium atoms

If you have two molecules of SnO2, how many oxygen atoms are present?

• Four oxygen atoms

• Three oxygen atoms

• Six oxygen atoms

• Two oxygen atoms