Chapter 12: Thermochemistry
A. Knowledge (Definition, meaning and facts) | Check |
- What is exothermic reaction and endothermic reaction?
State an example for each reaction.
- What is heat of precipitation?
- What is heat of displacement?
- What is heat of neutralisation?
- What is heat of combustion?
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B. Understanding / Application / Analysis | |
- Explain how exothermic reaction and endothermic are formed based on energy change during formation and breaking of chemical bonds.
- Explain why the heat of combustion of butanol is higher than ethanol.
- Explain why the heat of neutralisation between strong acids and strong alkalis is a constant,
that is -57kJmol-1?
- Explain why the heat of neutralisation between ethanoic acid and sodium hydroxide is less than
-57kJmol-1?
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.
- 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.
- 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.
- 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.
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C. Synthesis | |
- Describe a laboratory experiment to determine the heat of displacement of copper by zinc.
- Describe a laboratory experiment to determine the heat of neutralisation between strong acids and strong alkalis.
- Describe a laboratory experiment to determine the heat of combustion of methanol.
- "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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