Chemical Reactions and Conservation Laws Quiz

What is conserved during a chemical reaction?

• Only atoms

• Only mass

• Neither mass nor atoms

• Both mass and atoms

How many total atoms are present on the left-hand side of the equation in the example given?

• 23 atoms

• 21 atoms

• 19 atoms

• 25 atoms

What is the total mass calculated for the left-hand side of the equation?

• 204

• 220

• 210

• 198

On the right-hand side, how many oxygen atoms are there in total?

• 12 oxygen atoms

• 10 oxygen atoms

• 8 oxygen atoms

• 14 oxygen atoms

What is the significance of balancing a chemical equation?

• To make the reaction faster

• To ensure the number of atoms and mass are conserved

• To change the products of the reaction

• To ensure the number of molecules is the same on both sides

Which of the following is not conserved in a chemical reaction?

• Molecules

• Mass

• Energy

• Atoms

In the sodium and chlorine example, what is the total mass on the left side?

• 50.5

• 60.5

• 55.5

• 65.5

How many total atoms are present in the sodium and chlorine example on the right side?

• 7 atoms

• 6 atoms

• 5 atoms

• 4 atoms

What is the total mass calculated for the final example on the right side?

• 189

• 179

• 209

• 199

In the final example, how many total atoms are there on both sides of the equation?

• 8 atoms

• 9 atoms

• 11 atoms

• 10 atoms