Unit 3-Chemistry in Society Flashcards Preview

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Flashcards in Unit 3-Chemistry in Society Deck (43)
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1

What are the main properties of metals

Metals are malleable, they conduct electricity and they have a high melting point

2

What does oil rig stand for?

Oxidation is loss and reduction is gain

3

Describe metallic bonding

The atoms are held together by an electrostatic attraction between the positive nucleus and the delocalised electrons

4

What are rare earth metals used for?

Computers, laptops, mobiles, tablets and GPS

5

Name two rare earth metals

Neodymium and dysprosium

6

How do you break down metal ores which are below copper on the reactivity series?

You can break them down by heating them up

7

How do you break down the metal ores which are situated above mercury but below aluminium in the reactivity series?

By mixing them with carbon and then reacting them with oxygen

8

How do you break down the metal ores which are situated above zinc in the reactivity series?

By electrolysis

9

What is redox reaction

Redox reaction occurs when electrons are lost by one substance during oxidation and are gained by another substance during reduction

10

How can you predict the voltage output when two metals are connected together using an electrolyte?

By their position on the electrochemical series, the larger the gap, the larger the voltage output

11

In an electrochemical cell, what is used to connect the two solutions?

An iron bridge/salt bridge

12

In an electrochemical cell, what direction does the electrons flow?

The electrons flow from the metal electrode which is higher up in the electrochemical series to the metal electrode lower down in the electrochemical series. If both electrodes are the same element then the metal in the solution indicates the electron flow.

13

What is the difference between thermosoftening and thermosetting plastics?

Thermosoftening plastics soften when heat is applied

14

What is the definition of a non-biodegradable plastic

It doesn't naturally break down

15

What happens when you burn a plastic?

Carbon monoxide is given off

16

What happens when you burn poly vinyl chlorine?

Hydrogen chloride is given off

17

What happens when you burn polyurethane?

Hydrogen cyanide is given off

18

Name two plastics and their uses

Kevlar-body armour
Poly(ethanol)- used in PVA glue

19

What are the two types of polymerisation?

Addition and condensation polymerisation

20

What is the polymer name of ethene?

Poly(ethene)

21

How do you identify if a polymer has been created through condensation or addition polymerisation?

If it's a condensation polymer it will have oxygen in its main carbon chain

22

What is the repeating unit?

The part of a polymer which is repeated

23

What are monomers?

Monomers are small molecules which join together to form the polymer and normally are unsaturated

24

Name two natural polymers

Rubber and silk

25

What is a polyester?

A plastic formed by a carboxylic acid and an alcohol

26

What gets produced in condensation polymerisation?

Water

27

Where does the H20 come from in condensation polymerisation?

The OH comes from the alcohol and the O comes from the carboxylic acid

28

What two compounds are traditionally used when creating a polyester?

Diols and dicarboxylic acids

29

What is a novel material?

A material that doesn't resemble anything that has previously been made

30

What is corrosion?

Corrosion is a chemical reaction which occurs on the surface of a metal