CSEE (Form 4) Fuels and Energy — practice questions

1. A fuel is judged on how well it delivers energy once burnt. 2. A good fuel supplies energy continuously and at a high rate. 3. It should also have a high calorific value, meaning high energy released per unit mass. 4. Carbon dioxide is the main product of combustion rather than a quality of the fuel, and it pollutes the environment. 5. Non-combustible material should be low, not high, since it does not burn and leaves ash behind. _Source: NECTA CSEE 2022 Chemistry 032, Question 1: Multiple Choice Items, item (iii)_

1. The question turns on whether the source can be replaced after use. 2. Renewable sources are replenished within a short period and can be used again. 3. Wind and solar energy are the standard examples. 4. Non-renewable sources such as fossil fuels cannot be reused once exploited. 5. Combustible describes whether something burns, and synthetic or natural describes origin, so neither answers the question of reuse. _Source: NECTA CSEE 2022 Chemistry 032, Question 1: Multiple Choice Items, item (v)_