This quiz consists of 10 Energetics multiple choice questions for the AQA AS and A-Level Chemistry specification.
The questions are a similar style and level of difficulty to the multiple-choice questions you’ll be given in the AQA Chemistry exams.
Though they’re based on the AQA specification, they’re also appropriate for students studying other exam boards.
Some of these questions are straightforward, some of them are horrible. You need to know how to do all of them by the time the exams come around though, so if there’s anything you can’t do (even if it seems a bit weird) make sure you work backward from the answer and figure out why the answer is what it is.
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Energetics multiple choice questions
If you’re using this as a test, allow yourself around 11-12 n=minutes to answer these questions. If you’re using them to learn from, feel free to use your textbook to help you.
As always with Chemistry, make sure you have your periodic table and your calculator handy.
1. What is the amount of energy, in Joules, needed to raise the temperature of 1 mole of water by 15℃? The specific heat capacity of water is 4.18 J g-1 K-1.
2. Which of the following equations does NOT represent the enthalpy of combustion of an element?
3. Which of the following statements are correct?
ii) The enthalpy of combustion of an element is zero by definition
iii) The enthalpy change of reaction is the heat change at constant pressure
iv) According to Hess’s Law the enthalpy change for a chemical reaction is the same, whatever route is taken from reactants to products
4. The enthalpy change for the thermal decomposition of CaCO3 is +177 kJ mol-1.
What is the enthalpy change in kJ for the thermal decomposition of 15.5.g of CaCO3?
5. The enthalpy of combustion of ethanol was determined by calorimetry and was found to be -1256 kJ mol-1 The data book value for the standard enthalpy of combustion of ethanol is -1371 kJ mol-1. What is the percentage error of the value determined by calorimetry?
6. Which of the following reactions has a negative enthalpy change?
7. Use the data in the table below to help you answer the following question:
| Compound | ΔcHΘ/kJ mol-1 |
|---|---|
| Benzene | -3267 |
| Carbon | -393.5 |
| Hydrogen | -286 |
8. Use the data in the table below to help you answer the question.
| Compound | ΔcHΘ/kJ mol-1 |
|---|---|
| Ethanol | -1367 |
| Methane | -890 |
| Ethane | -1560 |
| Methanol | -726 |
9. Use the data in the table below to help you answer the following question:
| Compound | ΔfHΘ/kJ mol-1 |
|---|---|
| Propane | 104.7 |
| Carbon Dioxide | -393.5 |
| Water | -286 |
10. The mean bond enthalpies of several bonds are shown in the table below.
| Bond | Bond Enthalpy/ kJ mol-1 |
|---|---|
| P-H | 322 |
| Cl-Cl | 244 |
| H-Cl | 428 |
| P-Cl | 326 |