C5 - energy changes

Question 1

what is an endothermic reaction?

Answer 1

transfer of energy from surroundings to reaction

Question 2

what is an exothermic reaction?

Answer 2

transfer of energy from the reaction to surroundings

Question 3

what are some examples of endothermic reactions?

Answer 3

thermal decomposition, photosynthesis, sherbet

Question 4

what are some examples of exothermic reactions?

Answer 4

combustion, respiration, neutralisation

Question 5

does the exothermic energy profile go up or down?

Answer 5

down

Question 6

does the energy profile for endothermic go up or down?

Answer 6

up

Question 7

what reactions has a decrease is temperature?

Answer 7

endothermic

Question 8

what reaction has an increase in temperature?

Answer 8

exothermic

Question 9

which reaction has a positive energy change?

Answer 9

endothermic

Question 10

which reaction has a negative energy change?

Answer 10

exothermic

Question 11

what are the control variables for the required practical?

Answer 11

volume and concentration of reactants used

Question 12

what are the independent variables for the required practical?

Answer 12

type of metals or solutions used

Question 13

what are the dependant variables used in the required practical?

Answer 13

the change in temperature

Question 14

what is the equation for calculating energy changes using enthalpies?

Answer 14

reactants - products