C4 - classifying materials

Question 1

Isotopes

Answer 1

Different atomic forms of the same element, which have the same number of protons, but different numbers of neutrons

Question 2

Alkali metals down group

Answer 2

More reactive
Higher density
Low melting point
Low boiling point

Question 3

Alkali metal + cold water

Answer 3

Hydrogen + metal hydroxide

Question 4

Halogens down group

Answer 4

Less reactive
Higher melting point and boiling point
Electronegativity decreases

Question 5

Electronegativity

Answer 5

tendency to attract a bonding pair of electrons

Question 6

Fluorine

Answer 6

Reactive yellow gas

Question 7

Chlorine

Answer 7

Fairly reactive dense green gas

Question 8

Bromine

Answer 8

Dense red brown volatile liquid

Question 9

Iodine

Answer 9

Dark grey crystalline solid or purple vapour

Question 10

Chlorine displacement reaction ionic equation

Answer 10

Cl2 + 2Br- = 2Cl- +Br2

Question 11

Making bleach

Answer 11

Room temp
2NaOH(aq) + Cl2(g) = NaClO + NaCl(aq) + H2O (l)
ClO- ion
disproportionation

Question 12

Argon

Answer 12

Inert atmosphere in filament lamps as non flammable

Protect metals being welded - stops reacting with oxygen

Question 13

Helium

Answer 13

Airships and party balloons - lower density than air

Question 14

Giant covalent structures

Answer 14

Graphite
Diamond
Silicon dioxide

Question 15

Transition metals

Answer 15

good catalysts (e.g. nickel)
more than one ion
colourful