Energy Transfer During Exothermic And Endothermic Reactions (GCSE Chemistry)

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?

In a simple classroom experiment measuring ?T when mixing reagents, which practise most reduces random error?

A student dissolves ammonium nitrate in water and records a fall in temperature. Which energy transfer statement is correct?

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?

On a reaction profile diagram, what does the vertical difference between reactants and products represent?

Which observation indicates a reaction has reached completion rather than being at equilibrium?

Which change to an experiment would reduce heat loss and give more accurate measurement of a temperature change in a simple calorimetry experiment?

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

Which phrase best explains why activation energy is required for a chemical reaction?

Which of these processes is endothermic?

Which experimental observation best shows a reaction is exothermic?