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Review - Reactions
Kontribusi oleh: Ihara
(Penulis asli: Narayanan)
  • 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) 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) None of these
B) Chemical change
C) Physical change
  • 6. Burning of wax
A) Chemical change
B) Physical change
C) None of these
  • 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) Gas was produced in the chemical reaction.
B) A color change took place.
C) A physical change took place
D) One of the new chemicals that formed was a solid.
  • 12. Which is a physical change?
A) rusting iron
B) burning wood
C) when food rots
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 hydrochloric acid
B) zinc and hydrogen
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, carbon and water
B) heat
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) sugar, carbon and water
B) heat
C) sugar
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) manganese dioxide and oxygen
B) manganese dioxide & hydrogen peroxide
C) hydrogen peroxide and oxygen
D) 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) none of the answers are correct
C) sodium hydroxide + carbon dioxide + sodium carbonate --> water
D) sodium carbonate + water --> sodium hydroxide + carbon dioxide
  • 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) none of these are correct
B) a change of state
C) change in temperature
D) oxygen gas is produced
  • 22. Two clear liquids are mixed together and the result is shown in this photo. What sign of a reaction is shown?
A) none of these are correct.
B) precipitate formation
C) increase in temperature
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) 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 or oxygen
B) oxygen
C) carbon dioxide
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) hydrogen
B) carbon dioxide
C) marble chips
D) hydrochloric acid
E) oxygen
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