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Chemistry

Chemistry · Quick practice · answer shown after each question

Energy changes

Question 1 of 10

Question 1 of 10

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

Question 2 of 10

Question 2 of 10

The burning of fuels is

Question 3 of 10

Question 3 of 10

The heat of combustion of ethanol is −1,370 kJ/mol. Burning 4.6 g of ethanol (M = 46) releases

Question 4 of 10

Question 4 of 10

Which process is endothermic?

Question 5 of 10

Question 5 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 6 of 10

Question 6 of 10

Breaking chemical bonds

Question 7 of 10

Question 7 of 10

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

Question 8 of 10

Question 8 of 10

A reaction that absorbs heat from the surroundings is

Question 9 of 10

Question 9 of 10

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

Question 10 of 10

Question 10 of 10

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

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