1) The reactants in this reaction are.../ Choose all correct answers. a) water b) hydrogen c) oxygen d) air 2) The product of this reaction is..... a) water b) hydrogen c) oxygen d) air 3) If 36g of Hydrogen react with chlorine to make 92g of HCl. How many grams of chlorine are needed? a) 128g b) 36g c) 92g d) 56g 4) What hazard symbol will be displayed on a substance that harms the environment? a) a b) b c) c d) d 5) What hazard symbol will be displayed on a substance that should be kept away from fire? a) a b) b c) c d) d 6) A powder was heated in the lab. What observations indicate that a chemical reaction took place? Choose all correct answers. a) Powder dissolved b) Bubbles were formed c) The powder melted and then solidified again when cooled. d) The powder emitted a strong smell e) The powder changed color.

Chemical reactions Review 2

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