Chemistry- 9 (Oceans)

Question 1

How to calculate if soluble or not

Answer 1

Calculate enthalpy change of solution, if small then soluble

Question 2

How to calculate enthalpy change of solution?

Answer 2

Q= mcT

Question 3

What is charge density?

Answer 3

Charge/ radius

‘ ability to attract ions and form ionic bonds’

Question 4

How to calculate total entropy change

Answer 4

Entropy of system+ entropy of surroundings

Question 5

How to calculate entropy of system?

Answer 5

Entropy of products- Entropy of reactants

Question 6

How to calculate entropy of surroundings

Answer 6

• enthalpy change ( IN J) / temp (K)

Question 7

Property of a feasible reaction

Answer 7

Total entropy is positive ( link with temp, whether at certain temps a reaction is possible)

Question 8

How to calculate Ksp ( solubility product)

Answer 8

Conc multiplied, and state symbols are aq

No of mols becomes the power

Question 9

How to calculate pH

Answer 9

-log10 [H+]

Question 10

How to turn pKa to Ka

Answer 10

10^-pKa

Question 11

How to calculate [H+] from Ka

Answer 11

Root Ka x [acid]

Question 12

How to calculate Ka

Answer 12

Conc of ions (products) / conc of reactant

Question 13

Calculate [H+] of a buffer

Answer 13

Ka× [reactant]/[Base]

Question 14

Types of radiation involved in greenhouse effect

Answer 14

UV in, earth emits IR absorbed by greenhouse gases, remitted into atmosphere