C1 chemistry game gcse all exam boards

Reply 20

z_o_e

OP

11

Original post by alyxgower

They have a lower boiling/melting point

Give 3 properties of smart polymers

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Reply 21

j3ss1cah

Whats the uses of polymers?

Reply 22

username2199397

18

Difference between fractional distillation?

Process of Fractional distillation (4)?

How can you make resulats more accurate/realible?

Properties polymers + smart polymers?

Difference between polymers and smart polymers?

What is smelting?

How are plant oils extracted?

These are the questions I dont know the answers to lol

Reply 23

PC.police

2

Original post by j3ss1cah

A mixture of carbon and hydrogen atoms chemically bonded as compounds? Is that right

Depends. In Edexcel IGCSE, what are hydrocarbons is a two mark question. One mark for saying they're a compound hydrogen and carbon and another marks for "only". So a compound that only contains hydrogen and carbon.

Reply 24

username2574405

2

Original post by shohaib712

Difference between fractional distillation?

Process of Fractional distillation (4)?

How can you make resulats more accurate/realible?

Properties polymers + smart polymers?

Difference between polymers and smart polymers?

What is smelting?

How are plant oils extracted?

These are the questions I dont know the answers to lol

I can't be bothered to answer them all but seeds are crushed then pressed between two metal plates to extract the oil. Smart polymers return to a remembered shape and results can be reliable by making sure they're reproducible and repeating then taking a mean.

Reply 25

roryburke901

5

How is poly(ethene) made?

Reply 26

username2199397

18

Original post by alyxgower

I can't be bothered to answer them all but seeds are crushed then pressed between two metal plates to extract the oil. Smart polymers return to a remembered shape and results can be reliable by making sure they're reproducible and repeating then taking a mean.

would you get the mark for mentioning that they can be extracted using a solvent and distillating it too?

Reply 27

PC.police

2

Original post by roryburke901

How is poly(ethene) made?

Addition reaction of Ethene. Breaking it's double carbon carbon bond, and using it to bond to other ethane/ethene molecules?

Reply 28

IAmAnTroll

4

The number of 15 year old smokers in the UK is 3.5691 x 10^4
The number of 15 year olds in the UK is 7.647 x 10^6

What is the percentage of 15 year old smokers in the UK?

Reply 29

PC.police

2

Original post by IAmAnTroll

The number of 15 year old smokers in the UK is 3.5691 x 10^4
The number of 15 year olds in the UK is 7.647 x 10^6

What is the percentage of 15 year old smokers in the UK?

.5% to 1 S.F

Reply 30

Anmol_.

11

Original post by IAmAnTroll

The number of 15 year old smokers in the UK is 3.5691 x 10^4
The number of 15 year olds in the UK is 7.647 x 10^6

What is the percentage of 15 year old smokers in the UK?

We won't get something like this :colonhash:

chemistry is always on topic so I'll be very surprised to receive something like this again. Anyway answer is above :h:

Reply 31

JickDee

13

whats the melting point of aqa gcse biology students

Reply 32

Roseline19985

South america and africa fit and they share the same fossil fuels

Reply 33

roryburke901

5

Original post by PC.police

Addition reaction of Ethene. Breaking it's double carbon carbon bond, and using it to bond to other ethane/ethene molecules?

Pretty much.

- Many ethene molecules reacted together
- Breaking the double carbon bond, so it is now only ethane molecules
- Creating a long chain of hydrocarbons
- This is called a polymerisation reaction

Reply 34

username2574405

2

Original post by shohaib712

would you get the mark for mentioning that they can be extracted using a solvent and distillating it too?

Oh yeah I forgot about that! You would, if it's more than a 2 mark question I'd say mention both ways.

Reply 35

z_o_e

OP

11

Original post by alyxgower

Oh yeah I forgot about that! You would, if it's more than a 2 mark question I'd say mention both ways.

How is fractional distillation done?

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Reply 36

username2574405

2

Original post by z_o_e

How is fractional distillation done?

Posted from TSR Mobile

Crude oil is made of hydrocarbons, it is entered in a fractionating column and is heated. As it vaporises those with lower boiling points rise up to the top of the column and condense, leaving as fractions. This is because the top of the column is cool and the bottom hot. Those with higher boiling points leave at the bottom as they are longer chain molecules.

Why is copper suitable for wires?

Reply 37

z_o_e

OP

11

Original post by alyxgower

Crude oil is made of hydrocarbons, it is entered in a fractionating column and is heated. As it vaporises those with lower boiling points rise up to the top of the column and condense, leaving as fractions. This is because the top of the column is cool and the bottom hot. Those with higher boiling points leave at the bottom as they are longer chain molecules.

Why is copper suitable for wires?