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1) Chalk, limestone, marble, eggshells and seashells are made of a. calcium hydroxide b. calcium oxide c. calcium carbonate d. calcium chloride
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2) The conservation of mass is obtained when the total mass of reactants is equal to total mass of a. products b. molecules c. protons d. atoms
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3) Chemical changes are a. reversible b. irreversible c. interchangeable d. non interchangeable
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4) If baking soda or fruit salt is mixed with vinegar, there takes place a a. chemical reaction b. physical reaction c. transference d. both a and b
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5) Burning of fossils fuel results in the production of a. bio gas b. oxygen c. carbon dioxide d. nitrogen
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6) At room temperature iron and sulphur a. do no react b. react c. vigorously react d. somehow react
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7) If both water and carbon dioxide is given to plant it will not be able to prepare its own food in absence of a. sugar b. soil c. sunlight d. fertilizers
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8) Melting, freezing, boiling, evaporation and condensation are all a. physical change b. chemical change c. complex change d. electrical change
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9) Chemical change involves the formation of a. products b. new substances c. salts d. water
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10) The change which is not accompanied by formation of new substance is called a a. physical change b. chemical change c. complex change d. electrical change
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