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Review - Reactions
Contribuido por: Ihara
(Autor original: Narayanan)
  • 1. Burning of coal
A) Physical change
B) Chemical change
C) None of these
  • 2. Melting of wax
A) None of these
B) Physical change
C) Chemical change
  • 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) Physical change
B) None of these
C) Chemical change
  • 7. Eating of food
A) Chemical change
B) Both physical and chemical changes
C) Physical change
  • 8. Boiling of water
A) both physical and chemical change
B) 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) One of the new chemicals that formed was a solid.
B) A color change took place.
C) Gas was produced in the chemical reaction.
D) A physical change took place
  • 12. Which is a physical change?
A) rusting iron
B) melting ice
C) when food rots
D) burning wood
  • 13. Which is a physical change?
A) burning coal
B) dynamite exploding
C) chopping onions
D) digesting food
  • 14. When Potassium Chlorate is heated it melts into a liquid. This is a ____ Change.
A) chemical
B) combustion
C) physical
  • 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) hydrochloric acid and hydrogen
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) 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
B) carbon and water
C) heat
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) oxygen
B) manganese dioxide & hydrogen peroxide
C) hydrogen peroxide and oxygen
D) manganese dioxide 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 hydroxide + carbon dioxide + sodium carbonate --> water
B) sodium hydroxide + carbon dioxide --> sodium carbonate + water
C) none of the answers are correct
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) none of the answers are correct
D) barium nitrate + sulfuric acid --> barium sulfate + nitric 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) precipitate formation
B) gas formation
C) none of these are correct.
D) increase in temperature
  • 23. Look at the photo of a chemical reaction. Which statement is true?
A) the products were liquid water and solid sodium chloride
B) hydrogen could possibly be a product in this reaction
C) none of the answers are correct.
D) a precipitate was the reactant
  • 24. Which gas is burning in this picture?
A) carbon dioxide
B) hydrogen
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
D) oxygen or hydrogen
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) hydrochloric acid
B) carbon dioxide
C) hydrogen
D) marble chips
E) oxygen
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