Question 1
Which statement correctly discriminates between an exothermic reaction and an endothermic reaction?
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Chemistry · Unit 1 · Chemical reactions — reactants, products and energy change · Chemical reactions
Discriminate between exothermic and endothermic reactions.
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Question 2
A student carries out an experiment in which calcium oxide powder is added to water in a beaker. The beaker becomes very hot to the touch. Which of the following statements correctly describes and explains this observation?
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Question 3
A student places 50.0 mL of 1.0 mol L⁻¹ hydrochloric acid (HCl) and 50.0 mL of 1.0 mol L⁻¹ sodium hydroxide (NaOH) in separate beakers, both at 22.0°C. The solutions are then mixed in a polystyrene cup calorimeter. After mixing, the temperature of the resulting solution is measured as 28.5°C. Deduce if this neutralisation reaction is exothermic or endothermic. Explain your reasoning.
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