Energetics

Question 1

what is the symbol for energy change that accompanies a reaction?

Answer 1

▲H

Question 2

define an exothermic reaction

Answer 2

energy is given out when products form and the temperature of the surroundings gets hotter

Question 3

what is the shape of the energy profile for an exothermic reaction?

Answer 3

goes up, but then comes down more to a lower than original position

Question 4

do products have less or more energy than reactants in an exothermic reaction?

Answer 4

less

Question 5

what are the ▲H values for exothermic reactions?

Answer 5

<0, as energy is given to surroundings

Question 6

define endothermic reactions?

Answer 6

energy is taken in when products form and the temperature of the surroundings get cooler

Question 7

what is the shape of a energy profile for an endothermic reaction

Answer 7

goes up a lot, then comes down less to a higher than original position

Question 8

do products have more or less energy than reactants in an endothermic reaction?

Answer 8

more

Question 9

what are the ▲H values for endothermic reactions?

Answer 9

> 0, as energy is taken from surroundings

Question 10

what is activation energy?

Answer 10

the amount of energy that must be supplied to break bonds in reactants, thereby initiating the reaction

Question 11

is more energy required to break or make bonds in an exothermic reaction?

Answer 11

make bonds

Question 12

is more energy required to break or make bonds in an endothermic reaction?

Answer 12

break bonds

Question 13

is bond breaking an endothermic or exothermic process?

Answer 13

endothermic

Question 14

is bond making an endothermic or exothermic process?

Answer 14

exothermic

Question 15

what does the graph of a thermometric titration look like on a graph where y axis is temp and x axis is volume of acid

Answer 15

a triangle, where the peak corresponds to the volume of acid added at the point of neutralisation, and the temp at neutralisation