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Review - Reactions
  • 1. Burning of coal
A) None of these
B) Chemical change
C) Physical change
  • 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) Chemical change
C) Physical change
  • 4. Cutting a log of wood into pieces is a chemical change.
A) True
B) False
C) None of these
  • 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) Chemical change
C) None of these
  • 6. Burning of wax
A) Physical change
B) None of these
C) Chemical change
  • 7. Eating of food
A) Chemical change
B) Physical change
C) Both physical and chemical changes
  • 8. Boiling of water
A) both physical and chemical change
B) Chemical change
C) Physical 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 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) A physical change took place
B) A color change took place.
C) One of the new chemicals that formed was a solid.
D) Gas was produced in the chemical reaction.
  • 12. Which is a physical change?
A) when food rots
B) melting ice
C) rusting iron
D) burning wood
  • 13. Which is a physical change?
A) burning coal
B) digesting food
C) dynamite exploding
D) chopping onions
  • 14. When Potassium Chlorate is heated it melts into a liquid. This is a ____ Change.
A) chemical
B) physical
C) combustion
  • 15. When a piece of zinc was place in hydrochloric acid, hydrogen and zinc chloride formed. What are the reactants?
A) zinc chloride and hydrogen
B) zinc and hydrogen
C) zinc and hydrochloric acid
D) hydrochloric acid and hydrogen
  • 16. Carbon and water were produced by heating up sugar at a very high temperature. What are the products?
A) heat
B) sugar, carbon and water
C) sugar
D) carbon and water
  • 17. Carbon and water were produced by heating up sugar at a very high temperature. What are the reactants?
A) carbon and water
B) sugar, carbon and water
C) heat
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) none of the answers are correct
B) sodium carbonate + water --> sodium hydroxide + carbon dioxide
C) sodium hydroxide + carbon dioxide + sodium carbonate --> water
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
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  • 21. What sign of a reaction is present in this photo?
A) a change of state
B) change in temperature
C) oxygen gas is produced
D) none of these are correct
Lead II iodide precipitating out of solution
  • 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
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  • 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
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  • 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) hydrogen
B) oxygen
C) oxygen or hydrogen
D) carbon dioxide
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) oxygen
B) carbon dioxide
C) hydrogen
D) hydrochloric acid
E) marble chips
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