Untitled Video Quiz

What does the law of conservation of mass state?

• Mass is only important in physical changes

• Mass remains constant in a chemical reaction

• Mass is irrelevant in chemical equations

• Mass can be created or destroyed

What does a coefficient in a chemical formula indicate?

• The number of atoms in a molecule

• The temperature of the reaction

• The type of chemical reaction

• The number of molecules present

How do you balance an equation?

• By changing the subscripts

• By removing products

• By adjusting the coefficients

• By adding more reactants

In the reaction of aluminum with oxygen, how many aluminum atoms are needed on each side?

• One aluminum atom

• Four aluminum atoms

• Two aluminum atoms

• Three aluminum atoms

What is the purpose of balancing chemical equations?

• To make them look nice

• To ensure the same number of atoms on both sides

• To increase the speed of the reaction

• To change the products of the reaction