Metals and Non-metals

Question 1

Most ductile metal

Answer 1

gold

Question 2

best and worst conductors of heat

Answer 2

silver/copper

lead/mercury

Question 3

PVC

Answer 3

Polyvinylchloride

Question 4

2 metals which have very low melting points

Answer 4

gallium caesium

Question 5

non mental which has lustre

Answer 5

iodine

Question 6

allotropes of carbon that have metallic properties

Answer 6

diamond: hard, high melting/boiling point

graphite: conductor

Question 7

metals that are soft and have low melting points

Answer 7

alkali metals

lithium, sodium, potassium

Question 8

metal + oxygen
examples

Answer 8

4Al + 3O2&raquo_space; 2Al2O3

2Cu + O2&raquo_space;2CuO

Question 9

amphoteric oxides

Answer 9

oxides that show both basic and acidic nature by producing salts and water w both

ex aluminium oxide, zinc oxide

Question 10

show that aluminium oxide is amphoteric

Answer 10

Al2O3 + 6HCl&raquo_space; 3H2O + 2AlCl3
acid

Al2O3 + 2NaOH&raquo_space; H2O + 2NaAlO2

sodium aluminate

Question 11

2 metallic oxides soluble in water to produce alkali

Answer 11

Na2O + H2O&raquo_space; 2NaOH

K2O + H2O&raquo_space; 2KOH

Question 12

why are potassium and sodium immersed in kerosene oil

Answer 12

they are very reactive to oxygen and catch fire if kept in the open

Question 13

which metals do not react w oxygen at high temps

Answer 13

silver and gold

Question 14

reactivity series

Answer 14

K
Na
Ca
Mg
Al
Zn
Fe
Pb
(H)
Cu
Hg
Ag
Au

Question 15

ionic compounds properties

Answer 15

1. solid, hard, brittle
   - strong inter ionic attraction
2. solubility
   - water
   - not in kerosene petrol
3. conduct
   - solid state: ions cant move due to rigid structure
   - molten state: electrostatic forces are overcome due to heat so ions move freely
4. melting and boiling points
   - high, strong inter-ionic attraction requires high energy to break