Chemistry

1In an endothermic reaction, the products have less energy than the reactants.

2The enthalpy of neutralisation of a strong acid by a strong base is about

3Activation energy is the minimum energy needed for a reaction to occur.

4Given A → B, ΔH₁ = −286 kJ, and B → C, ΔH₂ = −572 kJ, find ΔH for A → C.

5Given A → B, ΔH₁ = −394 kJ, and B → C, ΔH₂ = −572 kJ, find ΔH for A → C.

6Bond making is

7A neutralisation releases 1.425 kJ when 0.025 mol of water is formed. Calculate the enthalpy of neutralisation.

8The temperature of 100 g of water rises by 10 °C. How much heat was absorbed? (c = 4.2 J g⁻¹ °C⁻¹)

9The temperature of 250 g of water rises by 5 °C. How much heat was absorbed? (c = 4.2 J g⁻¹ °C⁻¹)

10An exothermic reaction