Q.1
In an exothermic reaction...
  • energy is absorbed from the surroundings and the temperature increases
  • energy is released to the surroundings and the temperature of the surroundings increases
  • energy is absorbed from the surroundings and the temperature of the surroundings decreases
  • energy is released to the surroundings and the temperature of the surroundings decreases
Q.2
In an endothermic reaction...
  • energy is absorbed from the surroundings and the temperature increases
  • energy is released to the surroundings and the temperature of the surroundings increases
  • energy is absorbed from the surroundings and the temperature of the surroundings decreases
  • energy is released to the surroundings and the temperature of the surroundings decreases
Q.3
When an exothermic reaction takes place, the reaction mixture gives out heat because...
  • more energy is released when new bonds are formed than is taken in when existing bonds in the reactants are broken
  • the radiation energy produced by the reaction has to be got rid of via diffusion
  • energy is always absorbed in a chemical change which makes new substances
  • in an exothermic change, the products are less stable than the reactants
Q.4
When ammonium nitrate is added to water, an endothermic reaction occurs and...
  • nothing changes
  • the temperature of the reaction mixture falls
  • the temperature rises
  • heat is given out
Q.5
Which of the following reactions is exothermic?
  • Photosynthesis
  • Combustion
  • Ethanoic acid + sodium carbonate
  • Ammonium nitrate + water
Q.6
Where will the products be in relation to the reactants in an endothermic energy diagram?
  • Lower
  • Higher
  • The same level
  • An energy level diagram doesn't show levels
Q.7
Energy change in a chemical reaction is represented by the symbol...
  • ΔE
  • H
  • ΔH
  • ΔT
Q.8
ΔH is negative for what type of reactions?
  • Endothermic
  • Oxidation
  • Displacement
  • Exothermic
Q.9
ΔH is positive for what type of reactions?
  • Endothermic
  • Oxidation
  • Displacement
  • Exothermic
Q.10
Energy changes in chemical reactions are measured in...
  • Joules
  • kJ
  • kJ/mol
  • kWh
0 h : 0 m : 1 s