Key Chemsitry Facts To Know Flashcards

1
Q

What is corrosion

A

The exposure of metals to oxygen, creating a layer of metal oxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How to work out the number of atoms of an element from its mass and relative atomic mass

A
  • Work out number of moles using n = m/mr
  • multiply no of moles by Avogadro’s number (6.02 * 10^23)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

If a question asks you to design a test for something what two things do you need to describe?

A

The steps of the experiment and the observations of what should happen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When measuring the mass of electrodes what two steps do you need to take?

A

Rinse and dry the electrodes
Weigh the mass, using a mass balance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Why can’t sodium be an electrode

A

Because it would react with the ions in the solution to form an ionic compound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When measuring a titration what do you need to include?

A

Write the answer to as many possible figures, eg : 23.60 NOT 23.6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How can you tell in the copper oxide and sulphuric acid when no more copper oxide needs to be added

A

The copper oxide stops fizzing, copper sulphate solution stops changing color and there is excess copper oxide as there is lots of black powder left in the bottom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What happens if a burrette was rinsed and not dried how will it if at all affect the titre volume

A

There will be no change

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Ways to make a titration better

A

Do a rough titration and measure it to there and then do it drop by drop
Don’t overfill burrette
Wash out the burrette and dry it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What color is a lithium ion flame

A

Red/crimson

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What color is a sodium ion flame

A

Yellow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What color is a potassium ion flame

A

Lilac

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What color is a calcium ion flame

A

Brick red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What color is a copper ion flame

A

Blue/green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What happens to copper as it burns in oxygen?

A

Turns black slowly as it’s covered in a black layer of copper oxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What happens to magnesium as it burns in oxygen?

A

Bright white flame burns , white solid is formed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What happens to calcium as it burns in oxygen?

A

Burns with a bright red flame, white solid formed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What happens to zinc powder as it burns in oxygen?

A

A bluefish flame is burned, and a white solid is formed

15
Q

What happens to potassium as it burns in oxygen?

A

Burns with a lilac flame, white solid is formed

16
Q

What happens to iron filings as it burns in oxygen?

A

Burns with an orange/yellow flame, a brown solid forms (Fe2O3)

17
Q

Which metals react with acids to form H2

A

Ca, Mg, Al, Zn and Fe

18
Q

Which metals don’t react with dilute acids

A

Copper, silver, gold and platinum

19
Q

Which metals react with steam but not water

A

Aluminum, zinc, and iron

20
Q

Which metals don’t react with water (or steam)

A

Tin, lead, copper, silver, gold and platinum

21
What happens to copper when it is reacted with HCl
No reaction
22
How do silver, gold and platinum react with oxygen
They don’t!!!
23
How do tin, lead and copper react with O2
Slowly - forming a layer of metal oxide
24
Main use for iron and why
In construction as krs strong and cheap
25
Main use for Aluminium and why
Pilot wires as it is a good conductor of electricity ans a low density
26
What 3 things are copper used for and why
- boilers and hot water pipes as they are unreactive - electrical wires (ans some saucepans) as they are excellent conductors
27
How is magnesium different from other alkali/alkaline earth metals when it reacts with water/steam?
Magnesium reacts slowly with cold water and fast with steam, whereas the rest all react fast with water
28
3 characteistsics of transition metals
- colourful - high density - IS used as a catalyst
29
what to remember on atom economy?
always need to use the balancing numbers eh if it’s 2Pb it needs to be 2*207 so 414
30
3 but 2 main reasons for not 100% percentage yield
- some reactions are incomplete - may be (unwanted side reactions) (LESS IMPORTANT): - some product is lost in purification/practical losses
31
Graphene structure and conditions
- graphene is a giant covalent structure and each carbon atom is bonded to 3 others - high melting point - strong covalent bonds so are strong - has one free delocalised electron so can conduct electricity
32
fullerene structure and characteristics
- simple molecular - each carbon atom is joined to 3 others with a free delocalised electron - only conducts electricity across the surface, so little movement of electrons meaning it’s a bad conductor of electricity - weak intermolecular forces leading to low melting point and low strength
33
diamond structure
- hard - each carbon atom is attached to 4 others - strong covalent bonds means they are hard and have very high melting points - doesn’t conduct electricity due to no delocalised electrons and so a poor conductor
34
calculate the mass of a hydrogen atom in g, using the data below Ar of H = 1
1 mole of H is 1g 1g = 6.02 * 10^23 atoms 1/6.02 *10^23 =1.661×10²² g
35
if the glass Pipette isn’t dried after being rinsed in the titration how will it if at all change the titration
it means more dilute sodium hydroxide, meaning less acid is needed to neutralize and hence a decreased value in the titration
36
if the conical flask isn’t dried after being rinsed in the titration how will it if at all change the titratio
no effect, as it does not affect the concentration/ amount of the sodium hydroxide meaning it will not effect the titration
41
How to do an easy test tube test to prove that cobalt is more reactive than copper
Put copper sulphate in a test tube then add a spatula of cobalt. The cobalt should displace the copper becoming cobalt sulphate and copper and so a red solid should form.
42
How to work out mass of one atom of magnesium?
Ar/ avogradro’s number So 24/6.02 * 10^23
43
what to remember on a dicarboxylic acid?
need an O connecting to the Carbon atom on both sides and then an H connecting to both Os (plus also two O double bonds)
44
Mr/Ar of oxygen
16