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Review - Reactions
Kontribusi oleh: Ihara
(Penulis asli: Narayanan)
  • 1. Burning of coal
A) None of these
B) Physical change
C) Chemical change
  • 2. Melting of wax
A) Physical change
B) Chemical change
C) None of these
  • 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) Chemical change
B) None of these
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) 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 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 color change took place.
B) A physical 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) burning wood
B) rusting iron
C) melting ice
D) when food rots
  • 13. Which is a physical change?
A) digesting food
B) chopping onions
C) burning coal
D) dynamite exploding
  • 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 chloride 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
C) sugar, carbon and water
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
C) sugar, carbon and water
D) heat
  • 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) hydrogen peroxide and oxygen
C) manganese dioxide & hydrogen peroxide
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) none of the answers are correct
B) sodium hydroxide + carbon dioxide + sodium carbonate --> water
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 nitrate <-- sulfuric acid + barium sulfate + nitric acid
B) none of the answers are correct
C) barium nitrate + sulfuric acid --> barium sulfate + nitric acid
D) barium sulfate + nitric acid --> barium nitrate + sulfuric acid
  • 21. What sign of a reaction is present in this photo?
A) a change of state
B) oxygen gas is produced
C) none of these are correct
D) change in temperature
  • 22. Two clear liquids are mixed together and the result is shown in this photo. What sign of a reaction is shown?
A) gas formation
B) increase in temperature
C) precipitate formation
D) none of these are correct.
  • 23. Look at the photo of a chemical reaction. Which statement is true?
A) hydrogen could possibly be a product in this reaction
B) none of the answers are correct.
C) a precipitate was the reactant
D) the products were liquid water and solid sodium chloride
  • 24. Which gas is burning in this picture?
A) carbon dioxide
B) oxygen
C) hydrogen
D) hydrogen or oxygen
  • 25. When you put a glowing splint into this gas, it will relight. What is the gas?
A) oxygen or hydrogen
B) carbon dioxide
C) oxygen
D) hydrogen
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) marble chips
B) hydrogen
C) oxygen
D) carbon dioxide
E) hydrochloric acid
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