Periodicity

Question 1

Whats the reaction between group 2 elements and water?

Answer 1

X(s) + h2o —-> x(OH)2 + H2

Question 2

Whats the reaction between group 2 elements and dilute acid?

Answer 2

X(s) + acid (aq) —-> Xacid + H2

Fizzing cloudy

Question 3

Whats the reaction between group 2 elements and oxygen?

Answer 3

X(s) + O2 —-> XO
MG - bright white light
CA - aromatic white flame with a red glow

Question 4

Whats the reaction between oxides and water?

Answer 4

XO + H2O —-> X(OH)2

Question 5

What the reaction between group 2 and carbonates?

Answer 5

XCO3 —-> XO + CO2

Question 6

Whats the physical properties of the halogens?

Answer 6

F2 = yellow
CL = green
Br = brown/ orange
I2 = grey/violet

Question 7

Whats the trend of melting point and boiling point of halogens?

Answer 7

increase size = more van der vaals

Question 8

Whats the formula for the reduction of halogens?

Answer 8

X + 2e- —-> 2X- (g)

Question 9

Whats the trend of reactivity in halogens?

Answer 9

Decreases as the ease of gaining an e- decreases down the group

Question 10

Whats the trend of reactivity in group 2 metals?

Answer 10

Increases as the ease of losing an e- increases

Question 11

Whats the trend of redox for group 2 ?

Answer 11

Stronger down as increase in radius and shielding decreses nuclear attraction easier to remove electron

Question 12

Whats the trend of redox of halogens?

Answer 12

Weaker as increase in radius and shielding means its unlikely to gain an electron

Question 13

Define displacement

Answer 13

A more reactive element displaces a less reactive element from an aqueous solutions of the letters ions

Question 14

Whats the equations for Bromine displacement?

Answer 14

Br2 + 2I- —-> 2BR- +I2

Question 15

Whats the equations for chlorine displacement?

Answer 15

Cl2 + 2BR- —-> 2Cl- +BR2

Same for I2

Question 16

Whats disproportiation?

Answer 16

When an element undergoes redox

Question 17

Whats the reactions of halide ions?

Answer 17

Ag + +halide ion —->AG(halogen)
AGCL = white precipitate
AGBR - Cream
AGI - yellow

Question 18

How do you test for ammonium ions?

Answer 18

Warm mixture and test gas by placing damp litmus paper on the mouth of tube and if goes blue ammonia gas is present

Question 19

Whats the test for ammonium chloride?

Answer 19

When heated undergoes thermal decomp