SC19a Endothermic and Exothermic Reactions

Question 1

What happens during chemical reactions (energy)?

Answer 1

energy is transferred between the surroundings and the reactants during chemical reactants

Question 2

how is energy often transferred in chemical reactions?

Answer 2

by heating

Question 3

exothermic reactions?

Answer 3

energy is transferred from stored of energy in chemical bonds to the surroundings

Question 4

what happens to temperature in exothermic reaction?

Answer 4

increases

Question 5

endothermic reaction?

Answer 5

energy is transferred from the surroundings to stores of energy in chemical bonds

Question 6

what happens to temperature in a endothermic reaction?

Answer 6

decrease

Question 7

what do reaction profiles show?

Answer 7

the energy change during chemical reactions

Question 8

what type of reaction is salts dissolving in water?

Answer 8

endothermic or exothermic

Question 9

what type of reaction is neutralisation reaction?

Answer 9

exothermic

Question 10

how to improve experiments involving temperature change in an exothermic reaction?

Answer 10

~add a lid to reduce heat transfer
~use a larger amount of reactant to increase temp changes observed

Question 11

what type of reaction is a precipitation reaction?

Answer 11

exothermic or endothermic

Question 12

what happens in precipitation reactions

Answer 12

an insoluble salt forms from two soluble salts

Question 13

what type of reaction is a displacement reaction?

Answer 13

exothermic

Question 14

what are displacement reactions between?

Answer 14

~metal and a compound of a less reactive metal
~halogen and a compound containing a less reactive halogen