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