Group 2 Trends Flashcards Preview

Chemistry As > Group 2 Trends > Flashcards

Flashcards in Group 2 Trends Deck (13):
1

Why does melting point decrease down the trend

Metallic bonds decrease in strength as the electrons are further from the nucleus

2

How many electrons must be removed from a group 2 element to have complete ionisation

2

3

Describe the trend in reactivity with water down group 2

More reactive

4

Using M for the metal what is the general equation for the reactions of group 2 metal with water

M(s)+H2O---->M(oh)2(aq)+H2(g)

5

What is another name for magnesium, hydroxide

Milk of magnesia

6

What is milk of magnesia used for

Stomach acid neutraliser
Because it produce an alkaline solution

7

What can calcium hydroxide be used for

Treating acidic soil, called slaked lime

8

Describe the trend in how soluable the hydroxides are in group 2

More soluable down the group all producing white solids

9

Ba(OH)2 can dissolve to form an alkaline solution what is the equation for this

Ba(OH)2------> Ba2+ +2OH-

10

Describe the solubility of group 2 sulphates

Less soluable

11

Barium sulphate is virtually in soluable give to uses of this

Barium meal lines but in an x ray doesn't dissolve therefore can be used despite toxicity

Test for sulphate ions in solution

12

Describe the test for sulphate ions using barium sulphate

Solution acidified with nitric acid to remove carbinate ions
Add barium chloride
Barium sulphate produced as a precipitate

13

Why must carbinate ions be removed for the sulphate ion test

Barium carbinate produced a white precipitate which is indistinguishable from that of barium sulphate