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Flashcards in Unit 3 Deck (53)
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1

What happens when monomers join together during addition polymerisation?

Double bond breaks allowing free electrons to bond

2

What is a repeating unit?

Smallest part of chain that can represent the whole polymer

3

What are condensation polymers made from?

Monomers with two functional groups in each molecules

4

What is the condensation polymerisation general equation?

Idol + dicarboxylic acid -> polyester + water

5

When monomers join together during condensation polymerisation, what molecule is lost?

Water

6

What three elements provide nutrients for plants?

Nitrogen, phosphorus and potassium (NPK)

7

What is the haber process used for?

To make ammonia (NH3) from nitrogen and hydrogen

8

What is ammonia used for?

The making of fertilisers

9

What catalyst is used in the Haber process?

Iron

10

What is the Ostwald process?

When ammonia is used to make nitric acid

11

What are the starting materials for the Ostwald process?

Oxygen and ammonia

12

How does oxygen and ammonia combine to form nitrogen oxide in the Ostwald process?

In a reaction chamber where the catalyst is platinum

13

How can percentage mass of an element in a compound be calculated?

% mass = total mass of element/ formula mass X 100%

14

Describe a metal's structure

A giant lattice of positively charged metal ions in a sea of delocalised electrons

15

How does a metal conduct electricity?

Delocalised electrons are free to move around

16

Metal + water -> ?

Metal hydroxide + hydrogen

17

Metal + acid -> ?

Salt + hydrogen

18

Metal + oxygen -> ?

Metal oxide

19

Which end of the reactivity series is most reactive?

Top

20

What is oxidation?

The loss of electrons

21

What is reduction?

The gaining of electrons

22

Where are most metals found?

In rocks called ores

23

What metals can be extracted with electrolysis?

Highly reactive, e.g - magnesium, aluminium

24

How can metals with a medium reactivity be extracted?

Heat with carbon (eg - zinc, iron, tin ,copper)

25

How could silver or gold be extracted?

Heat alone

26

When are addition polymers formed?

When lots of small unsaturated molecules (monomers) join together

27

What is a reducing agent?

An element that causes the reduction of the metal from it's ore

28

What does an electrolyte do?

It allows a flow of ions and connects the circuit

29

Which way do the electrons flow form metal to metal?

High metal in electrochemical series gives electrons to lower metal

30

What does a bigger gap (in electrochemical series) give?

A higher voltage