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Review - Reactions
Contribuição de: Ihara
(Autor original: Narayanan)
  • 1. Burning of coal
A) Physical change
B) None of these
C) Chemical 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) Physical change
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) Physical change
C) Chemical change
  • 6. Burning of wax
A) Chemical change
B) Physical change
C) None of these
  • 7. Eating of food
A) Chemical change
B) Both physical and chemical changes
C) Physical 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) 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) rusting iron
B) when food rots
C) melting ice
D) burning wood
  • 13. Which is a physical change?
A) burning coal
B) chopping onions
C) digesting food
D) dynamite exploding
  • 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) hydrochloric acid and hydrogen
B) zinc and hydrochloric acid
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) sugar, carbon and water
B) heat
C) carbon and water
D) sugar
  • 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 and oxygen
B) manganese dioxide & hydrogen peroxide
C) oxygen
D) hydrogen peroxide 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 carbonate + water --> sodium hydroxide + carbon dioxide
B) sodium hydroxide + carbon dioxide + sodium carbonate --> water
C) sodium hydroxide + carbon dioxide --> sodium carbonate + water
D) none of the answers are correct
  • 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) barium nitrate <-- sulfuric acid + barium sulfate + nitric acid
C) none of the answers are correct
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) change in temperature
C) oxygen gas is produced
D) none of these are correct
  • 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) precipitate formation
D) none of these are correct.
  • 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) 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
B) carbon dioxide
C) oxygen
D) hydrogen or oxygen
  • 25. When you put a glowing splint into this gas, it will relight. What is the gas?
A) hydrogen
B) carbon dioxide
C) oxygen or hydrogen
D) oxygen
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) hydrochloric acid
B) oxygen
C) hydrogen
D) marble chips
E) carbon dioxide
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