group 2

Question 1

why does reactivity increase down group 2

Answer 1

first ionisation energy decreass

less energy requires to mive the outermost electron

Question 2

how are group 2 compounds used in farming

Answer 2

to neurtalise acidic soilds
metal hydroxides, metal oxides and metak carbonates
mainly calcium

Question 3

give a group 2 compound used in medicine and state how and why is it used

Answer 3

magnesium hydroxide
used to neutralise excess stomach acid as its a not too strong alkali
treats indigestion

Question 4

give 4 observations og group 2 elements with acid

Answer 4

fizzing, more vigurous down the group
metal dissolves, faster down the group
solution heating
bubbles of H2 forming

Question 5

what changes for group 2 hydroxides down the group and why

Answer 5

solubility increases and alkalinity increases

more OH- ions released so high pH

Question 6

what is decomposition

Answer 6

the speration if a single compound into two or more elements/ compounds

Question 7

what changes for group 2 carbonates down the group

Answer 7

ease of thermal decomposition decreases

Question 8

why are group 2 metals reducing agents

Answer 8

it looses 2 electrons and reduces other elements

Question 9

what happens when magnesium reacts with steam

Answer 9

produces magnesium oxide and hydrogen

Question 10

what happens when group 2 metals react with water

Answer 10

they form metal hydroxide and hydrogen

Question 11

what hooens when group 2 metals react with oxygen

Answer 11

form metal oxide