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Review - Reactions
供稿人: Ihara
(原作者: Narayanan)
  • 1. Burning of coal
A) Chemical change
B) None of these
C) Physical change
  • 2. Melting of wax
A) Physical change
B) None of these
C) Chemical change
  • 3. Crushing aluminium to make aluminium foil
A) Physical change
B) None of these
C) Chemical change
  • 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) None of these
B) Chemical change
C) Physical change
  • 6. Burning of wax
A) Physical change
B) None of these
C) Chemical change
  • 7. Eating of food
A) Physical change
B) Chemical change
C) Both physical and chemical changes
  • 8. Boiling of water
A) both physical and chemical change
B) Physical change
C) Chemical 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 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) One of the new chemicals that formed was a solid.
B) Gas was produced in the chemical reaction.
C) A physical change took place
D) A color change took place.
  • 12. Which is a physical change?
A) burning wood
B) rusting iron
C) melting ice
D) when food rots
  • 13. Which is a physical change?
A) digesting food
B) dynamite exploding
C) burning coal
D) chopping onions
  • 14. When Potassium Chlorate is heated it melts into a liquid. This is a ____ Change.
A) physical
B) combustion
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 hydrochloric acid
B) hydrochloric acid and hydrogen
C) zinc 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) carbon and water
B) heat
C) sugar
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) 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) manganese dioxide & hydrogen peroxide
B) oxygen
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 carbonate + water --> sodium hydroxide + carbon dioxide
C) none of the answers are correct
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) none of the answers are correct
D) barium nitrate <-- sulfuric acid + barium sulfate + nitric acid
  • 21. What sign of a reaction is present in this photo?
A) none of these are correct
B) oxygen gas is produced
C) change in temperature
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) increase in temperature
B) none of these are correct.
C) precipitate formation
D) gas formation
  • 23. Look at the photo of a chemical reaction. Which statement is true?
A) the products were liquid water and solid sodium chloride
B) a precipitate was the reactant
C) none of the answers are correct.
D) hydrogen could possibly be a product in this reaction
  • 24. Which gas is burning in this picture?
A) hydrogen or oxygen
B) carbon dioxide
C) oxygen
D) hydrogen
  • 25. When you put a glowing splint into this gas, it will relight. What is the gas?
A) carbon dioxide
B) oxygen
C) oxygen or hydrogen
D) hydrogen
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) marble chips
B) carbon dioxide
C) oxygen
D) hydrogen
E) hydrochloric acid
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