Energy Transfer During Exothermic And Endothermic Reactions (GCSE Chemistry)

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

When calculating energy change using bond energies, which general rule is correct?

Which experimental change would decrease the measured temperature change for an exothermic dissolution in a simple cup calorimeter?

Which measurement is most directly used to calculate the energy change when a solution is warmed by a reaction in a simple calorimeter?

A student measures highest temperature reached when reacting fixed volumes of acid with increasing mass of a solid reactant. Which trend would indicate the reaction is exothermic as mass increases?

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

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

When ammonium nitrate dissolves in water the solution temperature falls. This process is therefore called:

Which statement correctly describes an exothermic chemical reaction?

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

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?