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Review - Reactions
Contribuido por: Ihara
(Autor original: Narayanan)
  • 1. Burning of coal
A) Chemical change
B) None of these
C) Physical change
  • 2. Melting of wax
A) None of these
B) Physical change
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) True
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) Physical change
C) Chemical change
  • 6. Burning of wax
A) Chemical change
B) None of these
C) Physical change
  • 7. Eating of food
A) Both physical and chemical changes
B) Chemical change
C) Physical change
  • 8. Boiling of water
A) Physical change
B) Chemical 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 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 physical change took place
B) A color change took place.
C) Gas was produced in the chemical reaction.
D) One of the new chemicals that formed was a solid.
  • 12. Which is a physical change?
A) melting ice
B) rusting iron
C) when food rots
D) burning wood
  • 13. Which is a physical change?
A) digesting food
B) burning coal
C) dynamite exploding
D) chopping onions
  • 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) zinc chloride and hydrogen
C) zinc and hydrogen
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) carbon and water
B) sugar, carbon and water
C) sugar
D) heat
  • 17. Carbon and water were produced by heating up sugar at a very high temperature. What are the reactants?
A) sugar
B) heat
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 & hydrogen peroxide
B) manganese dioxide and oxygen
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 hydroxide + carbon dioxide --> sodium carbonate + water
B) sodium carbonate + water --> sodium hydroxide + carbon dioxide
C) none of the answers are correct
D) sodium hydroxide + carbon dioxide + sodium carbonate --> water
  • 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) none of these are correct
B) a change of state
C) oxygen gas is produced
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) precipitate formation
B) none of these are correct.
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) none of the answers are correct.
D) hydrogen could possibly be a product in this reaction
  • 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 or hydrogen
C) hydrogen
D) oxygen
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) hydrochloric acid
B) marble chips
C) carbon dioxide
D) oxygen
E) hydrogen
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