2020

Question 1

Explain why the enthalpy of hydration becomes less exothermic from Li+ to K+

Answer 1

size decreases going down group
so charge density decreases
so attrATCION BETWEEN METAL ION AND THE WATER ION DECREASES

Question 2

Use the data in Table 1 to calculate a value for the electron affinity of chlorine. born haber

Answer 2

2(121) + 2X

x=365

Question 3

Use the data in Table 4 to calculate the enthalpy of hydration, in kJ mol–1, of bromide ions.

Answer 3

SOLOUTION = LLATICE DISOCAATION + CALCUIM +2X

Question 4

Give the meaning of the term relative atomic mass.

Answer 4

mean mass of an atom / 1/12 of an atom of carbon 12

Question 5

Effect on partial pressure of methanol

Answer 5

will increase

Question 6

State what is observed when silver nitrate solution is added to sodium fluoride

Answer 6

colourless

Question 7

formula of b

Answer 7

Al(oh)3(h20)3

white prepiitate

Question 8

equation for partial fraction

Answer 8

partical preasure = M.F x total preasure

Question 9

eqaution for mf

Answer 9

n/ n in whole thing

Question 10

what is the formula of c

condtion and equation

Answer 10

al(oh)6 3-

excess Na0h

Question 11

State what is observed when aqueous chlorine is added to sodium bromide solution.
Give an ionic equation for the reaction.

Answer 11

yellow soloution

cl2 + 2br- = 2cl- +BR2

Question 12

gibs free energry

Answer 12

AH = -49

AS -180 BUT DIVIDED BY 10000

Question 13

STATE one observation when solid soduim chloride reacts with conc sulfrica acid

Answer 13

misty fumes

NACL+H2S04 = NAHS04 +HCL

Question 14

hard question claulation

Answer 14

1:2 ratio

x4

Question 15

Deduce the half-equation for the reaction at the negative electrode.

Answer 15

4h+ +4e-+02 = 2h20

Question 16

one below that

Answer 16

glucose + 6 02 = 6 oxygen + 6 carbond dioxide