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Review - Reactions - اختبار
  • 1. Burning of coal
A) Chemical change
B) None of these
C) Physical change
  • 2. Melting of wax
A) None of these
B) Chemical change
C) Physical change
  • 3. Crushing aluminium to make aluminium foil
A) Chemical change
B) None of these
C) Physical 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) Chemical change
B) Physical change
C) None of these
  • 6. Burning of wax
A) Chemical change
B) Physical change
C) None of these
  • 7. Eating of food
A) Physical change
B) Both physical and chemical changes
C) Chemical change
  • 8. Boiling of water
A) both physical and chemical change
B) Physical change
C) Chemical 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) One of the new chemicals that formed was a solid.
C) Gas was produced in the chemical reaction.
D) A physical change took place
  • 12. Which is a physical change?
A) rusting iron
B) burning wood
C) melting ice
D) when food rots
  • 13. Which is a physical change?
A) digesting food
B) burning coal
C) chopping onions
D) dynamite exploding
  • 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) hydrochloric acid and hydrogen
B) zinc and hydrogen
C) zinc chloride and hydrogen
D) zinc and hydrochloric acid
  • 16. Carbon and water were produced by heating up sugar at a very high temperature. What are the products?
A) heat
B) carbon and water
C) sugar
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) 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) manganese dioxide & hydrogen peroxide
B) hydrogen peroxide and oxygen
C) manganese dioxide 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 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
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  • 21. What sign of a reaction is present in this photo?
A) none of these are correct
B) change in temperature
C) oxygen gas is produced
D) a change of state
Lead II iodide precipitating out of solution
  • 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) increase in temperature
C) none of these are correct.
D) gas formation
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  • 23. Look at the photo of a chemical reaction. Which statement is true?
A) hydrogen could possibly be a product in this reaction
B) a precipitate was the reactant
C) none of the answers are correct.
D) the products were liquid water and solid sodium chloride
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  • 24. Which gas is burning in this picture?
A) hydrogen or oxygen
B) hydrogen
C) oxygen
D) carbon dioxide
  • 25. When you put a glowing splint into this gas, it will relight. What is the gas?
A) oxygen
B) hydrogen
C) oxygen or hydrogen
D) carbon dioxide
  • 26. Which gas will turn limewater from a clear liquid to a cloudy one?
A) hydrogen
B) oxygen
C) hydrochloric acid
D) carbon dioxide
E) marble chips
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