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Chemistry

Chemistry · Quick practice · answer shown after each question

Energy changes

Question 1 of 10

Question 1 of 10

Hess's law states that the enthalpy change of a reaction

Question 2 of 10

Question 2 of 10

A reaction that absorbs heat from the surroundings is

Question 3 of 10

Question 3 of 10

Breaking chemical bonds

Question 4 of 10

Question 4 of 10

Which process is endothermic?

Question 5 of 10

Question 5 of 10

An exothermic reaction has an enthalpy change (ΔH) that is

Question 6 of 10

Question 6 of 10

Hess's law states that the total enthalpy change of a reaction

Question 7 of 10

Question 7 of 10

The heat change when 1 mole of a substance burns completely in oxygen is the

Question 8 of 10

Question 8 of 10

The enthalpy of neutralisation of a strong acid and strong base is about

Question 9 of 10

Question 9 of 10

When 50 cm³ of 1 M HCl reacts with 50 cm³ of 1 M NaOH, the temperature rises by 6.8 °C. The heat released is about (c = 4.2 J/g K; density 1 g/cm³)

Question 10 of 10

Question 10 of 10

Dissolving ammonium nitrate in water makes the solution

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.