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Flashcards in Chemistry 1a Deck (45)
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Name the three parts of an atom

Proton
Neutron
Electron

1

If an atom has 12 protons, how many electrons does it have ?

12. Atoms have the same amount of protons and electrons

2

What is the symbol of Iron ?

Fe

3

What do atoms in the same column share ?

They share properties

4

What does the centre section of the periodic table contain ?

Transition metals

5

What is the electron structure of sulphur if it contains 16 electrons ?

2,8,6

6

Why are noble gases unreactive ?

They have full outer shells

7

What is ionic bonding ?

When electrons are given and taken away to form ions. Reactions take place between metals and non-metals.

8

What is covalent bonding ?

When electrons are shared between non-metals.

9

2Mg + O2 -> ?

2MgO

10

What is limestone primarily made of ?

CaCO3

11

When CaCO3 is thermally decomposed, what is made ?

Calcium oxide (CaO) and carbon dioxide (CO2)

12

Calcium carbonate + sulphuric acid = ?
CaCO3 + H2SO4 = ?

Calcium sulphate (CaSO4) + carbon dioxide + water

13

Calcium oxide (CaO) + water = ?

Calcium Hydroxide or Ca(OH)2

14

What do you get if you add carbon dioxide to calcium hydroxide (Ca(OH)2) ?

Back to the start ! Calcium carbonate

15

Disadvantages of quarries ?

Sound pollution / eyesore / destroys habitats / atmospheric pollution / pollution

16

What are the advantages of limestone ?

Build houses / neutralize acids / provides jobs

17

What Is an ore ?

A rock which contains enough metal to be economically worthwhile to extract

18

What is reduction ?

When an ore's oxygen Is removed by forming CO2

19

Where on the reactivity scale do you have to be for reduction to take place ?

Below carbon

20

Where on the reactivity scale do you have to be for electrolysis to take place ?

Above carbon

21

What is electrolysis ?

The breaking down of a substance using electricity.

22

Describe the process of electrolysis

1. The anode is a metal ore, for example a copper ore. The their electrons are pulled off forming ions and turn to a solution
2. When they get near the cathode they gain electrons and turn back into copper atoms
3. The impurities are dropped off as sludge

23

What is displacement ?

When a more reactive metal replaces the less reactive metal, therefore taking away the impurities

24

What is bio leaching ?

Using bacteria to separate copper from copper sulphide.

25

What is phytomining ?

Growing plants in soil that contain copper

26

Why is recycling metals important ?

Mining uses energy which uses fossil fuels / fossil fuels are finite / saves money / metal is a finite resource / less landfill

27

Properties of metals include .......

-Strong
-Good conductors of heat and electricity
-Can be bent and hammered

28

What is an alloy ?

An alloy is a mixture of metals which produce better metals depending on their use

29

What is bronze made of ?

Copper and Tin