group 2

Question 1

what are the most common type of reactions for group 2 elements

Answer 1

redox

Question 2

how does group 2 elements react with oxygen

Answer 2

metal+oxygen–> metal oxide

Question 3

how does magnesium react with oxygen

Answer 3

forms white magnesium oxide and white light

Question 4

how does group 2 elements react with water

Answer 4

metal+water–> metal hydroxide+hydrogen
-alkaline solution

Question 5

how does group 2 metals react with acids

Answer 5

metal+acid–>salt+hydrogen

Question 6

what is the trend in ionisation energy down group 2

Answer 6

• decreases
• nuclear attraction decreases
  -sheilding increases
  -atomic radius increases

Question 7

how soluble are group 2 metals

Answer 7

-slightly soluble in water
- when solution becomes saturated metal and hydroxide ions will form a solid precipitate
-increases down the group

Question 8

how is calcium hydroxide used in agriculture

Answer 8

• added to fields to increase pH of acidic soils
• calcium hydroxide neutralises acid in the soil

Question 9

how is group 2 compounds used in medicine

Answer 9

• used as antacids for treating acid indigestion
  -indigestion tablets use magnesium and calcium carbonates as main ingredients

Question 10

what is the trend in melting points of group 2 metals

Answer 10

-decreases down the group
- metallic bonding weakens as atomic size increases
-distance between nucleus and electrons increases
-electrostatic forces between cations and delocalised electrons decreases