Energy Transfer During Exothermic And Endothermic Reactions (GCSE Chemistry)

If the activation energy for the forward reaction is 80 kJ/mol and for the reverse reaction is 120 kJ/mol, what is the overall enthalpy change?

In a simple calorimetry experiment dissolving a salt, doubling the mass of salt added (with excess solvent) tends to produce which effect on the measured temperature change, assuming the reaction remains the same per gram?

Which feature on a reaction profile is reduced when a catalyst is used (compared to no catalyst)?

A reaction releases 120 kJ when 2.0 moles of reactant A react. What is the enthalpy change per mole of A (kJ/mol)?

Which of the following best explains why some reactions are slow even though they are exothermic?

Which method gives the best reduction in experimental heat loss when measuring temperature change of a solution?

When hydrochloric acid neutralises sodium hydroxide, the reaction is exothermic. Which would you expect to measure during a titration if mixing volumes are larger but same concentrations?

Which factor will NOT change the activation energy of a reaction?

Which method reduces systematic error when measuring temperature change during a reaction?

When two reactants form products and the measured temperature of the reaction mixture decreases, which enthalpy sign should be recorded?

Which description best fits an enthalpy profile of an exothermic reaction?