Chemistry 4 - Classifying material

Question 1

Shielding is what

Answer 1

Attraction from the nucleus of the electron is decreased when there are loads of “INNER ELECTRONS” in the way

meaning the further out the electron is the less attraction due to increased shielding

Question 2

Isotopes are what

Answer 2

Different forms of the same element with several more/less neutrons which changes the mass number

Question 3

Relative atomic mass shows what

Answer 3

How much of each isotope there is compared to the total amount of the element in the world

Question 4

RAM =

Answer 4

      sum of the relative abundances

Question 5

Ionic compounds always have what

Answer 5

Giant ionic lattices

Question 6

Ionic Compounds all have what properties (2)

Answer 6

High melting/boiling point

Question 7

Which groups on the periodic table most likely form positive ions

negative ions?

Answer 7

groups 1 /2

Groups 16/17

Question 8

The charge formed (+1 , -2) is the same as what

Answer 8

The group they are found in

Question 9

Group 1 metals are known as what

Answer 9

Alkali metals

Question 10

When alkali metals are cut, what does it look like?

However over time what happens?

Answer 10

Shiny

Reacts with oxygen which tarnishes it

Question 11

The lower down in the alkali sequence, what happens to the boiling/melting point and the density

Answer 11

lower melting/boiling point

Higher density

Question 12

When alkali metal is placed in water, what two things forms?

Answer 12

metal hydroxide (sodium hydroxide)

and hydrogen

Question 13

How do you know if hydrogen is present from the alkali metal reaction with water

Answer 13

lighted splint creates squeeky pop

Question 14

Alkali metals always form what type of bond

Answer 14

Ionic bond

Question 15

What sort of compound is created iwth alkali metals in terms of colour

what can it dissolve in to form?

Answer 15

White compound

dissolves in water to produce colourless solution

Question 16

Group 17 are known as what

Answer 16

Halogens

Question 17

Going down group 17, what happens to the boiling point and melting point?

Answer 17

increase

Question 18

What happens to the reactivity of group 17 elements going down it

Answer 18

decreaes reactivity

Harder to gain an outer electron as its further away from the nucleus

therefore chlorine is most reactive

Question 19

What happens to the electronegativity of group 17 elements as you go down the groups

Answer 19

Decreases

The larger the atom, the less the force of attraction

Question 20

Halogens are all ….. with coloured …..

Answer 20

non metal with coloured vapours

Question 21

What colour is flourine

Answer 21

Yellow poisonous gas

Question 22

What colour is chlorine

Answer 22

Green poisonous gas

Question 23

What colour is bromine

Answer 23

Red-brown volatile liquid posionous

Question 24

What colour is iodine

Answer 24

dark grey crystalline solid or purple vapour

Question 25

what bonds are formed with metals as a halogen

Answer 25

Ionic Bond

Question 26

Halides are what

Answer 26

Negative Ion

Question 27

Alkali metals and halogens will form what

Answer 27

salts (sodium chloride)

Question 28

More reactive halogens will ... less reactive ones

Answer 28

displace

Question 29

if KBr is mixed with CL2, what happens? think displacement

Answer 29

Br2 is formed Orange Solution formed as Chlorine displaces the bromine

Question 30

KI and CL2

Answer 30

Brown solution (I2) formed As chlorine displaces Iodine

Question 31

KI and Br2

Answer 31

Brown Solution (I2) formed As Bromine displaces iodine

Question 32

Noble gases are all (3)

Answer 32

Inert colourless gases Non flammable

Question 33

Argon can be found in what? why

Answer 33

Provides inert atmosphere in filament lamps Its non flammable and stops hot filament from burning away

Question 34

Helium can be found where

Answer 34

Airships/party balloons

Question 35

as you go down the noble gases, what happens to the densities and boiling points

Answer 35

Both increase (goes from -269 to -62)

Question 36

Why dont molecular substance conduct electricity

Answer 36

No ions present to conduct charge

Question 37

covalent structures have high what they dont what?

Answer 37

Melting/boiling points Conduct electricity

Question 38

Why is graphite a good conductor of heat and electrciity

Answer 38

Has one free delocalised electron which can conduct heat/electricity

Question 39

Why are alloys harder

Answer 39

new metals distort the original layers of metal atoms, making it harder for them to slide over eachother Increasing hardness

Question 40

Simple molecular structures will have what properties

Answer 40

Very very low melting/boiling points (-269) Dont conduct electricity

Question 41

Giant metallic structures will have what properties

Answer 41

High melting/boiling points Can conduct electricity

Question 42

Giant Covalent structures will have what properties

Answer 42

High melting/boiling point Doesnt conduct electricity

Question 43

giant Ionic structures will have what properties

Answer 43

Medium melting/boiling points cant conduct electricity unless molten

Question 44

What transition metal ised useful for the hydrogenation of alkenes

Answer 44

Nicklel

Question 45

Iron (II) compound is what colour

Answer 45

Light Green

Question 46

iron (III) compound is what colour

Answer 46

orange/brown

Question 47

Copper compounds are what colour

Answer 47

Blue