Monday, September 7, 2009

Check List To Score A

Chapter 12: Thermochemistry

A. Knowledge (Definition, meaning and facts)

Check

  1. What is exothermic reaction and endothermic reaction?
    State an example for each reaction.

  2. What is heat of precipitation?

  3. What is heat of displacement?

  4. What is heat of neutralisation?

  5. What is heat of combustion?

B. Understanding / Application / Analysis

  1. Explain how exothermic reaction and endothermic are formed based on energy change during formation and breaking of chemical bonds.

  2. Explain why the heat of combustion of butanol is higher than ethanol.

  3. Explain why the heat of neutralisation between strong acids and strong alkalis is a constant,
    that is -57kJmol-1?

  4. Explain why the heat of neutralisation between ethanoic acid and sodium hydroxide is less than
    -57kJmol-1?

  5. 50 cm3 of 2 moldm-3 sodium hydroxide solution is added to 50 cm3 of 2 moldm-3 hydrochloric acid. The temperature increases t oC.
    1. If 100 cm3 of 2 moldm-3 sodium hydroxide solution is added to 100 cm3 of 2 moldm-3 hydrochloric acid, predict the increase in temperature.

    2. If 50 cm3 of 1 moldm-3 sodium hydroxide solution is added to 50 cm3 of 1 moldm-3 hydrochloric acid, predict the increase in temperature.

    3. If 50 cm3 of 4 moldm-3 sodium hydroxide solution is added to 50 cm3 of 4 moldm-3 hydrochloric acid, predict the increase in temperature.

C. Synthesis

  1. Describe a laboratory experiment to determine the heat of displacement of copper by zinc.

  2. Describe a laboratory experiment to determine the heat of neutralisation between strong acids and strong alkalis.

  3. Describe a laboratory experiment to determine the heat of combustion of methanol.

  4. "The higher the number of carbon atoms per molecule, the higher is the heat of combustion"
    Describe a laboratory experiment to prove that the above statement is true by using methanol, ethanol, propan-1-ol, butan-1-ol and pentan-1-ol.

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