More Exothermic and Endothermic reaction

Question 1

Energy transfer can be measured - PRACTICAL
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Answer 1

1) you can Measure the amount of energy released by chemical reaction by taking the temperature of the reagents, mixing them in a polystyrene cup and measuring the temperature of the solution at the end of the reaction.

2) The biggest problem with energy measurements is the amount of energy lost to surroundings

3) You can reduce it a bit by putting the polystyrene cup into a beaker of cotton wool to give more insulation, and putting a lid on the cup to reduce energy lost by evaporation

Question 2

Energy transfer can be measured - PRACTICAL
4-5

Answer 2

4) This methods works for neutralisation reactions or reactions between metals and acids, or carbonates and acids

5) You can also use this method to investigate what effect different variables have on the amount of energy transferred e.g. mass or conc of reactants used

Question 3

Energy transfer can be measured - PRACTICAL
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Answer 3

6) Heres how you could test the effect of acid concentration on the energy realised in a neutralisation reaction between HCL and NaOH

Question 4

( exothermic )Reaction profiles - show the relative energies of reactants and products

Answer 4

Products lower energy than reactants
Difference in height = overall energy change per mole

Initial rise = activation energy - minimum amount of energy required for the reactants to collide with each other

Greater activation energy = more energy required for the reactants to collide with each other

Question 5

( endothermic )Reaction profiles - show the relative energies of reactants and products

Answer 5

Products at higher level than reactants

Difference in height = overall energy change per mole