Chemical Reaction Quiz

1. The mass of the reactants must be ______________ the mass of the products

• greater than
• less than
• twice
• equal to

2. A ________________ is indicated by a color change, bubbles, or a change in temperature.

• phase change
• physical change
• chemical change

3. The amount of matter in a substance is ______________

• mass
• weight
• volume
• temperature

4. A ________________ chemical equation has the same number of atoms for each reactant and product.

• complete
• balanced
• exothermic
• unbalanced

5. Melting ice and cutting paper are examples of ___________________

• chemical changes
• physical changes
• phase changes

6. NaCl and FeSO₄ are examples of _______________.

• coefficients
• subscripts
• compounds
• mixtures

7. The "2" in H₂O and the "3" in CaCO₃ are examples of _____________________

• subscripts
• coefficients
• exponents
• multipliers

8. A chemical change always _____________________

• releases heat
• absorbs heat
• results in color change
• forms a new substance

9. The mass of reactants and products must be _____ after chemical reaction is finished.

• less than
• more than
• the same

10. Dissolving a substance is a _____ change.

• chemical
• physical