Bond breaking is an...
  • endothermic process
  • exothermic process
  • exciting process
  • eltothermic process
Bond making is an...
  • endothermic process
  • exothermic process
  • exciting process
  • eltothermic process
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
Electrolysis requires energy to make it work. This means it is...
  • an endothermic reaction
  • an exothermic reaction
  • an eltothermic reaction
  • a chemical reaction
Thermal decomposition is...
  • an exothermic reaction
  • an endothermic reaction
  • a common reaction
  • an energy rich reaction
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
Pick the correct combination of information for an exothermic reaction.
  • °C ↑ ΔH +ve
  • °C ↑ ΔH -ve
  • °C ↓ ΔH +ve
  • °C ↓ ΔH -ve
Neutralisation is...
  • an endothermic reaction
  • a physical reaction
  • an exothermic reaction
  • an oxidation reaction
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
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
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