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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) Chemical change
B) Physical change
C) None of these
  • 3. Crushing aluminium to make aluminium foil
A) Chemical change
B) Physical change
C) None of these
  • 4. Cutting a log of wood into pieces is a chemical change.
A) False
B) None of these
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) Physical change
C) Chemical change
  • 6. Burning of wax
A) None of these
B) Physical change
C) Chemical change
  • 7. Eating of food
A) Both physical and chemical changes
B) Physical change
C) Chemical change
  • 8. Boiling of water
A) Chemical change
B) Physical change
C) both physical and 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) Gas was produced in the chemical reaction.
C) A color change took place.
D) One of the new chemicals that formed was a solid.
  • 12. Which is a physical change?
A) rusting iron
B) when food rots
C) burning wood
D) melting ice
  • 13. Which is a physical change?
A) burning coal
B) dynamite exploding
C) digesting food
D) chopping onions
  • 14. When Potassium Chlorate is heated it melts into a liquid. This is a ____ Change.
A) physical
B) chemical
C) combustion
  • 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) zinc chloride and hydrogen
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) sugar
B) sugar, carbon and water
C) 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) sugar, carbon and water
B) sugar
C) heat
D) carbon and water
  • 18. In our gas test lab, oxygen was made by combining manganese dioxide with hydrogen peroxide. What are the reactants
A) hydrogen peroxide and oxygen
B) manganese dioxide and oxygen
C) 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 hydroxide + carbon dioxide + sodium carbonate --> water
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) 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) oxygen gas is produced
C) change in temperature
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) gas formation
C) none of these are correct.
D) precipitate formation
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  • 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) none of the answers are correct.
D) hydrogen could possibly be a product in this reaction
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  • 24. Which gas is burning in this picture?
A) oxygen
B) hydrogen
C) hydrogen or oxygen
D) carbon dioxide
  • 25. When you put a glowing splint into this gas, it will relight. What is the gas?
A) oxygen or hydrogen
B) oxygen
C) hydrogen
D) carbon dioxide
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) hydrogen
B) hydrochloric acid
C) marble chips
D) carbon dioxide
E) oxygen
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