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Review - Reactions
Prispevano od: Ihara
(Avtor originala: Narayanan)
  • 1. Burning of coal
A) Chemical change
B) None of these
C) Physical change
  • 2. Melting of wax
A) Physical change
B) None of these
C) Chemical 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) 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) Physical change
B) None of these
C) Chemical change
  • 6. Burning of wax
A) Physical change
B) None of these
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) 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) 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) rusting iron
B) melting ice
C) burning wood
D) when food rots
  • 13. Which is a physical change?
A) chopping onions
B) digesting food
C) burning coal
D) dynamite exploding
  • 14. When Potassium Chlorate is heated it melts into a liquid. This is a ____ Change.
A) combustion
B) chemical
C) physical
  • 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 chloride and hydrogen
C) zinc and hydrochloric acid
D) zinc 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) carbon and water
D) sugar, 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) heat
C) sugar
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 & hydrogen peroxide
B) manganese dioxide and oxygen
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) sodium hydroxide + carbon dioxide --> sodium carbonate + water
C) sodium carbonate + water --> sodium hydroxide + carbon dioxide
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) none of the answers are correct
B) barium nitrate + sulfuric acid --> barium sulfate + nitric acid
C) barium sulfate + nitric acid --> barium nitrate + sulfuric acid
D) barium nitrate <-- sulfuric acid + barium sulfate + nitric acid
  • 21. What sign of a reaction is present in this photo?
A) change in temperature
B) oxygen gas is produced
C) none of these are correct
D) a change of state
  • 22. Two clear liquids are mixed together and the result is shown in this photo. What sign of a reaction is shown?
A) precipitate formation
B) none of these are correct.
C) gas formation
D) increase in temperature
  • 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) a precipitate was the reactant
D) the products were liquid water and solid sodium chloride
  • 24. Which gas is burning in this picture?
A) hydrogen or oxygen
B) hydrogen
C) carbon dioxide
D) oxygen
  • 25. When you put a glowing splint into this gas, it will relight. What is the gas?
A) oxygen
B) carbon dioxide
C) oxygen or hydrogen
D) hydrogen
  • 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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