Q.1
Thermal decomposition is...
  • an exothermic reaction
  • an endothermic reaction
  • a common reaction
  • an energy rich reaction
Q.2
Bond breaking is an...
  • endothermic process
  • exothermic process
  • exciting process
  • eltothermic process
Q.3
Bond making is an...
  • endothermic process
  • exothermic process
  • exciting process
  • eltothermic process
Q.4
On an energy level diagram, the products of an exothermic reaction will be...
  • higher than the reactants
  • the same level as the reactants
  • on a different diagram to the reactants
  • lower than the reactants
Q.5
Which of the following observations indicate an endothermic reaction?
  • The temperature of the decaying grass in the compost maker was considerably above the outside temperature
  • Hydrogen peroxide and hydrazine react so explosively and energetically that they are used to power rockets into space
  • The mixture bubbled vigorously and the temperature dropped by 40°C
  • A red glow spread through the mixture and the temperature increased by 10°C
Q.6
ΔH is the energy change for the reaction. To calculate this...
  • add the reactants' energy to the products' energy
  • subtract the reactants' energy from the products' energy
  • divide the reactants' energy by the products' energy
  • subtract the products' energy from the reactants' energy
Q.7
Electrolysis requires energy to make it work. This means it is...
  • an endothermic reaction
  • an exothermic reaction
  • an eltothermic reaction
  • a chemical reaction
Q.8
Neutralization is...
  • an endothermic reaction
  • a physical reaction
  • an exothermic reaction
  • an oxidation reaction
Q.9
Pick the correct combination of information for an exothermic reaction.
  • °C ↑ ΔH +ve
  • °C ↑ ΔH -ve
  • °C ↓ ΔH +ve
  • °C ↓ ΔH -ve
Q.10
If a reaction is endothermic overall, what does this tell us about the bonds broken and made during the reaction?
  • There are equal amounts of energy required to break and make the bonds in the reaction
  • There is a lot of energy used for both making and breaking bonds
  • There is less energy used in breaking the bonds of the reactants than required to make the bonds of the products
  • There is more energy used in breaking the bonds of the reactants than required to make the bonds of the products
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