Law of Conservation of Mass and Chemical Reactions Quiz

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  • Created by: GSidhu
  • Created on: 12-04-18 10:49

1. In a chemical reaction, the mass of the reactants was 15g. The mass of the products was 12g. Did this chemical reaction follow the law of conservation of mass?

  • No
  • You cannot tell from the given information
  • Yes
  • Maybe
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2. Which of the following statements best explains the Conservation of Mass?

  • When added to a system, energy can destroy mass.
  • The mass of a closed system cannot change over time; mass cannot be created nor destroyed.
  • Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost.
  • Mass cannot be created but it can be destroyed under extreme pressures.

3. The following chemical reaction occurs: N2 + 3 H2 -> 2 NH3 How many atoms of hydrogen are there in the product?

  • 6 atoms of Hydrogen
  • 2 atoms of Hydrogen
  • 3 atoms of Hydrogen
  • 5 atoms of Hydrogen

4. Which is the smallest particle?

  • A star
  • A speck of dust
  • An atom
  • A grain of sand

5. What can a chemical reaction involve?

  • Atoms in the reactants being rearranged to form the products
  • Electrons being rearranged
  • Mass being rearranged
  • Atoms in the products being rearranged to form the reactants
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