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Review - Reactions
  • 1. Burning of coal
A) Physical change
B) Chemical change
C) None of these
  • 2. Melting of wax
A) None of these
B) Chemical change
C) Physical change
  • 3. Crushing aluminium to make aluminium foil
A) None of these
B) Physical change
C) Chemical change
  • 4. Cutting a log of wood into pieces is a chemical change.
A) None of these
B) True
C) False
  • 5. When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it?
A) None of these
B) Physical change
C) Chemical change
  • 6. Burning of wax
A) None of these
B) Chemical change
C) Physical change
  • 7. Eating of food
A) Physical change
B) Both physical and chemical changes
C) Chemical change
  • 8. Boiling of water
A) Chemical change
B) both physical and chemical change
C) Physical change
  • 9. All chemical reactions produce a gas.
A) True
B) False
  • 10. I mixed together two liquids and a solid formed. Choose the correct statement
A) This was a chemical change because a solid formed in the solution.
B) This is NOT a chemical reaction because we just mixed together two liquids. Dissolving is a physical change.
  • 11. I combined two clear liquid chemicals and a white precipitate formed. Why did this precipitate form?
A) One of the new chemicals that formed was a solid.
B) A color change took place.
C) Gas was produced in the chemical reaction.
D) A physical change took place
  • 12. Which is a physical change?
A) melting ice
B) rusting iron
C) burning wood
D) when food rots
  • 13. Which is a physical change?
A) burning coal
B) dynamite exploding
C) chopping onions
D) digesting food
  • 14. When Potassium Chlorate is heated it melts into a liquid. This is a ____ Change.
A) combustion
B) physical
C) chemical
  • 15. When a piece of zinc was place in hydrochloric acid, hydrogen and zinc chloride formed. What are the reactants?
A) zinc and hydrogen
B) zinc and hydrochloric acid
C) hydrochloric acid and hydrogen
D) zinc chloride and hydrogen
  • 16. Carbon and water were produced by heating up sugar at a very high temperature. What are the products?
A) sugar
B) carbon and water
C) sugar, carbon and water
D) heat
  • 17. Carbon and water were produced by heating up sugar at a very high temperature. What are the reactants?
A) heat
B) sugar
C) carbon and water
D) sugar, carbon and water
  • 18. In our gas test lab, oxygen was made by combining manganese dioxide with hydrogen peroxide. What are the reactants
A) oxygen
B) manganese dioxide & hydrogen peroxide
C) hydrogen peroxide and oxygen
D) manganese dioxide and oxygen
  • 19. Sodium carbonate and liquid water are produced in a reaction by combining sodium hydroxide and carbon dioxide gas. What is the correct word equation?
A) sodium hydroxide + carbon dioxide --> sodium carbonate + water
B) sodium hydroxide + carbon dioxide + sodium carbonate --> water
C) sodium carbonate + water --> sodium hydroxide + carbon dioxide
D) none of the answers are correct
  • 20. When barium nitrate reacts with sulfuric acid, barium sulfate and nitric acid are made. What is the correct word equation?
A) barium nitrate + sulfuric acid --> barium sulfate + nitric acid
B) barium sulfate + nitric acid --> barium nitrate + sulfuric acid
C) barium nitrate <-- sulfuric acid + barium sulfate + nitric acid
D) none of the answers are correct
  • 21. What sign of a reaction is present in this photo?
A) oxygen gas is produced
B) a change of state
C) none of these are correct
D) change in temperature
  • 22. Two clear liquids are mixed together and the result is shown in this photo. What sign of a reaction is shown?
A) increase in temperature
B) gas formation
C) precipitate formation
D) none of these are correct.
  • 23. Look at the photo of a chemical reaction. Which statement is true?
A) a precipitate was the reactant
B) the products were liquid water and solid sodium chloride
C) hydrogen could possibly be a product in this reaction
D) none of the answers are correct.
  • 24. Which gas is burning in this picture?
A) hydrogen
B) hydrogen or oxygen
C) carbon dioxide
D) oxygen
  • 25. When you put a glowing splint into this gas, it will relight. What is the gas?
A) hydrogen
B) oxygen
C) carbon dioxide
D) oxygen or hydrogen
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) hydrochloric acid
B) oxygen
C) carbon dioxide
D) marble chips
E) hydrogen
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