Extras

Question 1

Exothermic

Answer 1

Releases heat energy to the surroundings

The Temperature increases

Change in enthalpy is negative

Bond forming

Question 2

Endothermic

Answer 2

Heat energy is absorbed from the surroundings

The temperature decreases

Change in enthalpy is positive

Bonds breaking

Question 3

Enthalpy

Answer 3

The energy change which occurs during a chemical or physical change

Question 4

Electronegativity

Answer 4

FONCl

If the molecules are uneven then the molecule is polar is depending on the FONCl rule of most polar

Question 5

Moles

Answer 5

n= m/M

n= number of moles unit: mol or moles
m= mass of substance unit: g or grams
M= Molar mass unit: g/mol or grams per mole