Question 1:
The graph below shows a reaction profile for the reaction between methane and oxygen.
- Activation energy
- Overall energy change
- Reactants
- Progress of the reaction
Question 2:
What is the reading on the following thermometer?
- 28.3 oC
- 28.6 oC
- 29.2 oC
- 28.5 oC
Question 3:
A student adds a small amount of ammonium chloride to a beaker of water. The temperature of the water decreases from 21 oC to 17 oC.
Question 4:
The energy level diagram below shows the relative energies of the reactants and products in a reaction.
Question 5:
Calcium and hydrochloric acid react to produce calcium chloride and hydrogen gas. The energy level diagram for the reaction is shown below.
- The temperature of the surroundings increases.
- The reaction is endothermic.
- The products have less energy than the reactants.
- Energy is released during the reaction.
Question 6:
Which of the following processes is endothermic?
- Reacting sodium with water.
- The use of petrol in an engine.
- Distilling crude oil.
- Burning fossil fuels.
Question 7:
In all chemical reactions, bonds in the reactant species are broken and new bonds are formed in the products. Which statement is correct?
- Bond breaking requires energy and is thus an exothermic process.
- Bond breaking requires energy and is thus an endothermic process.
- Bond breaking releases energy and is thus an exothermic process.
- Bond breaking releases energy and is thus an endothermic process.
Question 8:
The reaction profile for making nitrogen monoxide, NO, is shown below:
- +140 kJ
- +180 kJ
- +320 kJ
- -330 kJ
Question 9:
Endothermic reactions can be used in emergency sports injury treatment packs.
- Absorb energy from the surroundings and transfer it to the injury
- Can be re-used
- Usually contain ammonium nitrate and water in separate compartments
- Cause the temperature of the surroundings to increase
Question 10:
Chlorine and ethane react together in an exothermic reaction to produce chloroethane and hydrogen chloride. The equation for the reaction is shown below.
- -120 kJ / mol
- -1020 kJ / mol
- +120 kJ / mol
- +1020 kJ / mol
Question 11:
The production of ammonia involves the exothermic reaction between nitrogen and hydrogen. The equation for the reaction is shown.
- -230 kJ / mol
- -1025 kJ / mol
- -87 kJ / mol
- +87 kJ / mol
Question 12:
Chlorine and hydrogen react in an exothermic reaction producing hydrogen chloride. The equation for the reaction is shown.
- -170 kJ / mol
- +240 kJ / mol
- +170 kJ / mol
- -240 kJ / mol
Question 13:
Methane combusts in oxygen as shown producing an energy change of -890 kJ / mol.
- -155 kJ / mol
- +333 kJ / mol
- -840 kJ / mol
- +841 kJ / mol
Question 14:
An energy level diagram is shown below.
