exo thermic and endothermic

Question 1

exothermic reaction

Answer 1

gives out energy to its surroundings

Question 2

bond energies are the amount

Answer 2

of energy required to break one mole of a particular covalent bond

Question 3

endothermic needs,

Answer 3

energy from the surroundings

Question 4

how do exothermic reaction usually release energy and how is it shown

Answer 4

in form of thermal energy, shown by the rise in temperature of the surroundings

Question 5

are combustion reactions exothermic or endothermic

Answer 5

exothermic

Question 6

how are endothermic reactions usually in the form of (energy) and how are they shown

Answer 6

usually in form of thermal energy and shown by fall of temperature of surroundings

Question 7

enthalpy change is

Answer 7

the overall amount of energy given out or taken in in a reaction is called the enthalpy change

Question 8

in exothermic reactions, the enthalpy change is ( positive / negative)

Answer 8

negative because energy is being released

Question 9

in endothermic reactions the enthalpy change is

Answer 9

positive because energy is being taken in