Answer all the questions below then hit the check answer button and scroll down to get your score.
1. In a chemical reaction the reacting chemicals are referred to as the:
2. Which of the following is a common characteristic of an exothermic reaction?
3. During an exothermic reaction what happens to the energy stored in the chemical bonds of the reactants?
4. Which of the following is an example of an exothermic reaction?
5. What happens to the temperature of the surrounding during an endothermic reaction?
6. In an endothermic reaction the product molecules contain:
7. Which of the following best describes the energy change that takes place during a neutralisation reaction?
8. What is the role of a sports injury cold pack?
a) To release heat and dilate the blood vessels b) To provide mechanical support to the injured area c) To create a chemical reaction that releases light energy to soothe the injured site d) To absorb heat and reduce swelling at the injury site
9. The reaction between citric acid and sodium bicarbonate in sherbet is an example of:
a) An exothermic reaction b) An endothermic reaction c) A neutralisation reaction d) A combustion reaction
10. What is the law of conservation of energy?
a) Energy can be created and destroyed b) Energy can be created but not destroyed c) Energy can be destroyed but not created d) Energy cannot be created or destroyed only transferred
11. What is the process of a metal carbonate breaking down when heated called?
a) Neutralisation b) Combustion c) Thermal decomposition d) Oxidation
12. A thermometer placed in an exothermic reaction will show:
a) A decrease in temperature b) An increase in temperature c) No increase in temperature d) Random fluctuations in temperature
13. What is contained in a self-heating can to heat its contents?
a) Chemicals that react exothermically b) Chemical that undergo a combustion reaction c) Chemicals that undergo a thermal decomposition reaction d) Chemicals that react endothermically
14. What two substances are used in self heating cans to create heat?
a) Hydrochloric acid and nitric acid b) Citric acid and sodium bicarbonate c) Iron and oxygen d) Calcium oxide and water
15. In a chemical reaction what name is given to the area outside the reacting chemicals?
a) The system b) The environment c) The surroundings d) The reactants
