Energy Transfer During Exothermic And Endothermic Reactions (GCSE Chemistry)

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

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

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

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?

If dissolving 8.0 g of a salt in 200 g water causes ?T = -2.0 °C and specific heat of solution ˜ 4.2 J/g·°C, what is energy absorbed (J) by dissolution? (Use 200+8 ˜ 208 g)

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

Which experimental observation best shows a reaction is exothermic?

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

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

Which of the following is the correct sign convention for enthalpy change (?H) in exothermic and endothermic reactions?