Chemical Quantities And Reactions

Question 1

Moles

Answer 1

-In chemistry, small particles such as atoms, molecules or ions are counted using moles.
-1 mole = 6.02 x 1023
i.e. a mole of anything is 6.02 x 1023 of
something (atoms, molecules, ions)
6.02 x 1023 is known as Avogadro’s number (2 decimal places)

Question 2

Molar mass

Answer 2

Molar mass is defined as the mass of a compound (g) divided by the amount of substance (mol) i.e. the units are in g/mol.

Question 3

Equation for concentration

Answer 3

N=concentration in litres x volume in litres

Question 4

Equation for dilutions

Answer 4

C1xv2=c2xv2

Question 5

Equilibrium

Answer 5

-occurs when the rate of the forward reaction is equal to the rate of the reverse reaction
-concentration is not changing

Question 6

Kc equation

Answer 6

Products over reactants

Question 7

Le chateliers principle

Answer 7

If a stress is applied to a system in dynamic equilibrium, the system will adjust to relieve that stress.

Question 8

Dynamic equilibrium

Answer 8

If a stress is applied to a system in dynamic equilibrium, the system will adjust to relieve that stress.

Question 9

What will happen to the equlibrium if there is a decrease in pressure(increased volume )

Answer 9

-decrease In pressure favours the side with most moles.equilibrium shifts to the left

Question 10

What happens to the equilibrium is there is an increase in pressure(decrease volume)

Answer 10

Increase in pressure favours the side with fewest molest.Equlibrium swifts to the right

Question 11

Effect of temperature on equlibrium

Answer 11

If forward reaction is exoteric the reverse reaction is endo