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BMAT > Chemistry 4 - Classifying material > Flashcards

Chemistry 4 - Classifying material Flashcards

1
Q

Shielding is what

A

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

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2
Q

Isotopes are what

A

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

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3
Q

Relative atomic mass shows what

A

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

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4
Q

RAM =

A 
      sum of the relative abundances
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5
Q

Ionic compounds always have what

A

Giant ionic lattices

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6
Q

Ionic Compounds all have what properties (2)

A

High melting/boiling point

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7
Q

Which groups on the periodic table most likely form positive ions

negative ions?

A

groups 1 /2

Groups 16/17

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8
Q

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

A

The group they are found in

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9
Q

Group 1 metals are known as what

A

Alkali metals

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10
Q

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

However over time what happens?

A

Shiny

Reacts with oxygen which tarnishes it

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11
Q

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

A

lower melting/boiling point

Higher density

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12
Q

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

A

metal hydroxide (sodium hydroxide)

and hydrogen

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13
Q

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

A

lighted splint creates squeeky pop

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14
Q

Alkali metals always form what type of bond

A

Ionic bond

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15
Q

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

what can it dissolve in to form?

A

White compound

dissolves in water to produce colourless solution

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16
Q

Group 17 are known as what

A

Halogens

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17
Q

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

A

increase

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18
Q

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

A

decreaes reactivity

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

therefore chlorine is most reactive

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19
Q

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

A

Decreases

The larger the atom, the less the force of attraction

20
Q

Halogens are all ….. with coloured …..

A

non metal with coloured vapours

21
Q

What colour is flourine

A

Yellow poisonous gas

22
Q

What colour is chlorine

A

Green poisonous gas

23
Q

What colour is bromine

A

Red-brown volatile liquid posionous

24
Q

What colour is iodine

A

dark grey crystalline solid or purple vapour

25
Q

what bonds are formed with metals as a halogen

A

Ionic Bond

26
Q

Halides are what

A

Negative Ion

27
Q

Alkali metals and halogens will form what

A

salts (sodium chloride)

28
Q

More reactive halogens will … less reactive ones

A

displace

29
Q

if KBr is mixed with CL2, what happens?

think displacement

A

Br2 is formed

Orange Solution formed as Chlorine displaces the bromine

30
Q

KI and CL2

A

Brown solution (I2) formed

As chlorine displaces Iodine

31
Q

KI and Br2

A

Brown Solution (I2) formed

As Bromine displaces iodine

32
Q

Noble gases are all (3)

A

Inert

colourless gases

Non flammable

33
Q

Argon can be found in what?

why

A

Provides inert atmosphere in filament lamps

Its non flammable and stops hot filament from burning away

34
Q

Helium can be found where

A

Airships/party balloons

35
Q

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

A

Both increase (goes from -269 to -62)

36
Q

Why dont molecular substance conduct electricity

A

No ions present to conduct charge

37
Q

covalent structures have high what

they dont what?

A

Melting/boiling points

Conduct electricity

38
Q

Why is graphite a good conductor of heat and electrciity

A

Has one free delocalised electron which can conduct heat/electricity

39
Q

Why are alloys harder

A

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

Increasing hardness

40
Q

Simple molecular structures will have what properties

A

Very very low melting/boiling points (-269)

Dont conduct electricity

41
Q

Giant metallic structures will have what properties

A

High melting/boiling points

Can conduct electricity

42
Q

Giant Covalent structures will have what properties

A

High melting/boiling point

Doesnt conduct electricity

43
Q

giant Ionic structures will have what properties

A

Medium melting/boiling points

cant conduct electricity unless molten

44
Q

What transition metal ised useful for the hydrogenation of alkenes

A

Nicklel

45
Q

Iron (II) compound is what colour

A

Light Green

46
Q

iron (III) compound is what colour

A

orange/brown

47
Q

Copper compounds are what colour

A

Blue

BMAT (21 decks)

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