synoptics

Question 1

Suggest why the enthalpy change for the thermal decomposition of solid silver nitrate (III) is difficult to determine experimentally

Answer 1

silver nitrate has to be heated so you cannot measure the temperature change caused by the reaction

Question 2

Explain how carbon dioxide causes global warming

Answer 2

C=O Bonds in CO2 absorb infrared radiation shows IR peak at 2350 cm-1
IR radiation emitted by the earth does not escape (from the atmosphere)

Question 3

State and explain how the rate of reaction for 1-iodobutane compares with the rate of 1-iodobutane
Predict how the graph will differ for 1-bromobutane compared to 1-iodobutane
(3)

Answer 3

rate of reaction would be slower for 1-bromobutane as C-Br bond stronger than C-I bond

How graph for 1-bromobutane will differ :
line for 1-bromobutane will be below that for 1-iodobutane

Question 4

what changes kc or kp?

Answer 4

only temperature

Question 5

why NaOH added dropwise near endpoint

Answer 5

there’s a large change in ph (from adding small volume)

Question 6

is ionisation energy always endothermc or exothermic?

Answer 6

endothermic (positive) as requires energy