thermo dynamics

Question 1

thermodynamics

Answer 1

study of heat changes that take place during a chemical reaction

Question 2

heat of reaction

Answer 2

the heat change that occurs during the course of a chemical reaction when the reaction occurs completely according to the balanced equation

Question 3

bond energy

Answer 3

average energy required to break one mole of a particular covalent bond and to separate the neutral atoms completely from each other

Question 4

exothermic

Answer 4

reactants greater than products so extra energy left in system so this is released as heat hence delta h is minus

Question 5

endothermic

Answer 5

products higher that reactants so not enough energy in system hence heat is absorbed from surrounding so delta h is positive

Question 6

heat of combustion

Answer 6

the heat change that occurs when 1 mole of a substance in completely burned in excess oxygen

Question 7

simple calorimeter

Answer 7

a vessel of negligible heat capacity which acts as an insulator and prevents a heat exchange between the system and the surroundings

Question 8

kilogram calorific value

Answer 8

heat energy produced when 1 kg of fuel is completely burned in excess oxygen

Question 9

heat of neutralisation

Answer 9

the heat change that occurs when 1 mol of h+ ions of an acid reacts with 1 mole of oh- ions from a base