4A 4B 4C

Question 1

which is the best technique to remove the silver chloride that forms when aqueous solutions of silver nitrate and sodium chloride react

Answer 1

filtration

Question 2

which property increases down Group 7

Answer 2

boiling point

Question 3

chlorine reacts with cold, dilute aqueous NaOH what are all the products formed

Answer 3

sodium chloride, sodium chlorate (I) and water

Question 4

explain why the thermal stability of caesium nitrate is greater than that of sodium nitrate

Answer 4

Cs+ has a greater atomic radius than a Na+ ion
Cs+ is poorer at polarising the anion as it has a lower charge density than Na+
Therefore requires a higher tempreture to decompose
Cs+ is poor at weakening bonds in the nitrate ion

Question 5

what are the thermal decomposition equations of calcium nitrate and sodium nitrate

Answer 5

NaNO2 = NaNo2 + 1/2 O2

Ca(NO3)2 = CaO + 2NO2 + 1/2O2

Question 6

name all the types of bonds present in calcium carbonate

Answer 6

ionic, covalent

Question 7

write the equation for the thermal decomposition of calcium carbonate

Answer 7

CaCO3 (s) = CaO(s) + CO2(g)

Question 8

give a reason in terms of bonding why high decomposition tempreture is required to decompose calcium carbonate

Answer 8

strong CO bond in the CO3 2- ion requires lots of thermal energy to break bonds

Question 9

equation for barium with cold water

Answer 9

Ba(s) + 2H2O(l) = Ba(OH)2 (aq) + H2(g)

Question 10

observation when Ba(OH)2 is added to sulfuric acid

Answer 10

white precipitate is formed

Question 11

what is formed when magnesium reacts with steam

Answer 11

magnesium oxide and hydrogen

Question 12

sodium chloride with concentrated sulfuric acid equation

Answer 12

NaCl + H2SO4 = NaHSO4 + HCL (g)