Balancing Chemical Equations Quiz Quiz

10 multiple choice questions

1. In a chemical equation, coefficients tell us the:

A) Subscripts B) Number of molecules or moles of each substance C) Mass numbers D) Atomic numbers

2. The law of conservation of mass states that mass:

A) Can be created in reactions B) Cannot be created or destroyed C) Always increases in reactions D) Always decreases in reactions

3. When balancing a chemical equation, you can change:

A) Subscripts in formulas B) Coefficients in front of compounds C) Chemical formulas of substances D) Element symbols

4. In the equation 2H2 + O2 -> 2H2O, the coefficient of O2 is:

A) 1 B) 2 C) 3 D) 4

5. A properly balanced equation has:

A) Unequal atoms on each side B) Equal numbers of each type of atom on both sides C) Different elements on each side D) No coefficients

6. In CH4 + 2O2 -> CO2 + 2H2O, the methane (CH4) has:

A) 1 C and 2 H B) 1 C and 4 H C) 4 C and 1 H D) 2 C and 4 H

7. In a chemical equation, the products are found on the:

A) Left side B) Right side C) Above the arrow D) Below the arrow

8. Catalysts in chemical equations:

A) Are consumed in the reaction B) Are not consumed and can be reused C) Increase mass of products D) Change the elements involved

9. The arrow symbol in a chemical equation means:

A) Plus B) Yields or forms C) Is equal to D) Minus

10. Physical changes differ from chemical changes because:

A) No change in mass occurs B) No new substances are formed in physical changes C) Temperature always changes D) State changes only

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