periodic table and energy

Question 1

explain why the reactivity of the group 2 elements Mg-Ba increases down the group

Answer 1

Atomic radius increases
OR
more shells
OR
more (electron) shielding

Nuclear attraction decreases
OR
(outer) electron(s) experience less attraction

Ionisation energy decreases
OR
less energy needed to remove electron(s)

Question 2

what is the systemic name for KClO4

Answer 2

potassium chlorate (VII)

Question 3

explain why halogen boiling points increase down the group

Answer 3

London forces increase
more electrons
more energy required to break London forces

Question 4

describe and explain how to determine the end point of an iodine titration accurately

Answer 4

add starch
blue to colourless

Question 5

state one benefit and one risk of using chlorine in water treatment

Answer 5

kills bacteria
toxic

Question 6

What is the systemic name for NaNO2

Answer 6

Sodium Nitrate (III)

Question 7

state 2 ways that the use of catalysts helps chemical companies to make their processes more sustainable and less harmful to the environment

Answer 7

lower energy demand/ lower temperatures
less fossil fuels burnt/ less CO2 emissions