CHEM-105, Visualizing Chemistry
Quiz 15, November 20, 2001

  1. As the temperature of a reaction system increases, the rate of the reaction will:
    A. increase
    B. decrease
    C. remain unchanged
    D. may increase or decrease depending on whether the reaction is exothermic or endothermic
  2. Hydrogen peroxide decomposes into water and oxygen in the presence of a catalyst. Which of the following hydrogen peroxide solutions would be expected to decompose most rapidly?
    A. 3% H2O2
    B. 30% H2O2
    C. 50% H2O2
    D. 100% H2O2
    E. all of the above will decompose at the same rates
  3. Magnesium metal reacts with a 10% hydrochloric acid solution to give off hydrogen gas. Magnesium wil lreact most rapidly if it is in the form of:
    A. thin strips
    B. coarse strips
    C. fine powder
    D. none of the above because the solid metal will always react at the same time
    E. Einstein
  4. The density of water at room temperature is:
    A. 0.79 g/mL
    B. 1.0 g/mL
    C. 1.2 g/mL
  5. A sample of pancake syrup having a volume of 22.2 mL is found to weigh 25.5 g. Calculate its density in grams per milliliter.
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