C2 - Material choices Flashcards Preview

Chemistry > C2 - Material choices > Flashcards

Flashcards in C2 - Material choices Deck (19)
Loading flashcards...
1

What is crude oil?

A mixture of hydrocarbons.

2

What is fractional distillation?

Takes place in a fractioning column separated into different fractions. Crude oil is sent through the bottom of the column (the hottest part) and Slowly makes it's way to the top (coolest part) leaving different parts of the crude oil in each fraction as it goes.

3

Fractional distillation Separates crude oil into different parts. Give examples of products that condense in the top half. what the are used for?

Gasoline - used in cars
Kerosene - aircraft fuel

4

Fractional distillation Separates crude oil into different parts. Give examples of products that condense in the bottom what the are used for?

Diesel - cars, lorries, busses
Fuel oil - ships
Bitumen - roads and roofs

5

What is methane?

An natural gas. Used in cookers, domestic burners, Bunsen burners and some power stations

6

What are the properties of polymer chains?

Long molecules that lie side by side.
Can uncoil and slide past each other. This makes the material flexible.

7

If you make the molecules of a polymer longer what will happen?

Stronger forces of attraction
Stronger, less flexible material is produced

8

What is the name for adding molecules to polymers during manufacture?

Plasticising

9

What do plasticisers do to a material?

They push the polymer molecules apart weakening the forces between them.
= softer flexible material.

10

What are the characteristics of PVC and uPVC. What are some uses?

PVC = hard
Used for pipes and window frames

uPVC = soft
Used for clothing and flooring

11

Chemical bonds can be formed to lol together the chains of some polymers. What is this called?

Cross linking

12

What are the characteristics of materials with cross links.

Tougher material. Less flexible.

13

What is a polymer?

Large molecule formed from many smaller molecules (monomer)

14

Characteristics of low density polyethene.

Structure is not crystalline.
Low density = force of attraction is weaker.
Low melting point.
Less strong.

15

Does HDPE or LDPE have a crystalline stricture.

High density polyethene.

16

Characteristics of high density polyethene.

Force of attraction between polymer molecules is stronger.
Material is stronger
Has higher melting point.

17

How big are nano particles?

One billionth of a meter

18

How big are nano particles?

One billionth of a meter

19

How big are nano particles?

One billionth of a meter