Physical Chemistry

Question 1

what happens when alkali is added to a reaction with H+ ions on the product side

Answer 1

equilibrium shifts to the right

Question 2

what happens when you dilute an acid

Answer 2

no of H+ ions decreases

pH increases

Question 3

strong acid and weak acid =

Answer 3

alkaline solution

Question 4

what should indicator be in a reaction with strong acid and weak acid

Answer 4

alkaline range

Question 5

disorder in spontaneous processes

Answer 5

increase in disorder

Question 6

conjugate base charge

Answer 6

-ve

Question 7

conjugate acid charge

Answer 7

+ve

Question 8

indicator if acid and base are weak

Answer 8

no indicator

Question 9

standard enthalpy of formation

Answer 9

element in natural state

Question 10

K if not stated

Answer 10

298 K

Question 11

highest entropy state

Answer 11

gas

Question 12

pH of weak acid

Answer 12

pH = 1/2pKa - 1/2logC

pKa = -logKa

Question 13

pH = 1/2pKa - 1/2logC

pKa = -logKa

Answer 13

pH of weak acid

Question 14

best indicator determined by

Answer 14

pH of salt

Question 15

reaction if delta G and delta entropy are negative

Answer 15

exothermic

Question 16

1st order

Answer 16

change in reactant is proportional to change in rate

Question 17

change in reactant is proportional to change in rate

Answer 17

1st order

Question 18

in equilibrium, if there are two solvents A and B, what happens when you add more B

Answer 18

the concentration of solute in B decreases

Question 19

what can order of reaction be determined by

Answer 19

experiment

Question 20

rate determining step

Answer 20

slowest step

Question 21

first order

Answer 21

what you do to reactant does to rate

Question 22

rate reaction

Answer 22

k [reactant 1] reactant 2]

Question 23

what does buffer need

Answer 23

weak acids

Question 24

K > 1

Answer 24

more products than reactants

Question 25

k < 1

Answer 25

more reactants than products

Question 26

exothermic changing temperature

Answer 26

rise: decrease in K
fall: increase in K

Question 27

endothermic changing temp

Answer 27

rise: increase in K
fall: decrease in K

Question 28

increase in temp favours what reaction

Answer 28

endothermic

Question 29

decrease in temp favours what reaction

Answer 29

exothermic

Question 30

reactants that do not take place in slowest step order

Answer 30

0 order

Question 31

homogeneous catalyst

Answer 31

same state

Question 32

when do buffers form

Answer 32

when a salt of a weak alkali dissolves in a weak acid

Question 33

when a salt of a weak alkali dissolves in a weak acid

Answer 33

buffers

Question 34

overall order

Answer 34

sum of all orders

Question 35

Acid definition

Answer 35

Donates proton leaving a conjugate base

Question 36

Donates proton leaving a conjugate base

Answer 36

Acid

Question 37

How does a buffer resist change in pH if alkali is added

Answer 37

OH- ions react with H+ ions and neutralise them

The H+ ions are replaced by the dissociation of the acid into H+ ions

Question 38

Calculate equilibrium constant for..

N2O4 —-><—— 2NO2

0.28 mol of N2O4 gas placed in an empty 1 litre flask and heated to 127 degrees. At equilibrium, 0.24 moles of NO2 present

Answer 38

0.36