Chemistry 1a

Question 0

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

Answer 0

12. Atoms have the same amount of protons and electrons

Question 1

Name the three parts of an atom

Answer 1

Proton
Neutron
Electron

Question 2

What is the symbol of Iron ?

Answer 2

Fe

Question 3

What do atoms in the same column share ?

Answer 3

They share properties

Question 4

What does the centre section of the periodic table contain ?

Answer 4

Transition metals

Question 5

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

Answer 5

2,8,6

Question 6

Why are noble gases unreactive ?

Answer 6

They have full outer shells

Question 7

What is ionic bonding ?

Answer 7

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

Question 8

What is covalent bonding ?

Answer 8

When electrons are shared between non-metals.

Question 9

2Mg + O2 -> ?

Answer 9

2MgO

Question 10

What is limestone primarily made of ?

Answer 10

CaCO3

Question 11

When CaCO3 is thermally decomposed, what is made ?

Answer 11

Calcium oxide (CaO) and carbon dioxide (CO2)

Question 12

Calcium carbonate + sulphuric acid = ?

CaCO3 + H2SO4 = ?

Answer 12

Calcium sulphate (CaSO4) + carbon dioxide + water

Question 13

Calcium oxide (CaO) + water = ?

Answer 13

Calcium Hydroxide or Ca(OH)2

Question 14

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

Answer 14

Back to the start ! Calcium carbonate

Question 15

Disadvantages of quarries ?

Answer 15

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

Question 16

What are the advantages of limestone ?

Answer 16

Build houses / neutralize acids / provides jobs

Question 17

What Is an ore ?

Answer 17

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

Question 18

What is reduction ?

Answer 18

When an ore’s oxygen Is removed by forming CO2

Question 19

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

Answer 19

Below carbon

Question 20

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

Answer 20

Above carbon

Question 21

What is electrolysis ?

Answer 21

The breaking down of a substance using electricity.

Question 22

Describe the process of electrolysis

Answer 22

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

Question 23

What is displacement ?

Answer 23

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

Question 24

What is bio leaching ?

Answer 24

Using bacteria to separate copper from copper sulphide.

Question 25

What is phytomining ?

Answer 25

Growing plants in soil that contain copper

Question 26

Why is recycling metals important ?

Answer 26

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

Question 27

Properties of metals include .......

Answer 27

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

Question 28

What is an alloy ?

Answer 28

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

Question 29

What is bronze made of ?

Answer 29

Copper and Tin

Question 30

What is sustainability ?

Answer 30

Meeting the needs if the present without compromising the needs of the future.

Question 31

What is crude oil ?

Answer 31

Crude oil is the buried remains of plants and animals

Question 32

What is crude oil made up of ?

Answer 32

Hydrocarbons carbon and hydrogen

Question 33

What is the difference between an Alkane and an alkene

Answer 33

Alkenes have double bonds

Question 34

What is the general formula of alkenes ?

Answer 34

CnH(2n)

Question 35

What us the general formula for alkanes ?

Answer 35

CnH(2n)+2

Question 36

What is the formula of ethane

Answer 36

C2H6

Question 37

The shorter the molecule the ............ Runny it is

Answer 37

More

Question 38

The shorter the molecule the ............ Volatile it is.

Answer 38

More

Question 39

What does sulphur dioxide cause ?

Answer 39

Acid rain

Question 40

Carbon dioxide causes global warming but what is so bad about global warming ?

Answer 40

Causes climate change which can be drastic if change by as little as 1 degree. Polar ice caps may melt causing floods.

Question 41

When incomplete combustion occurs carbon is released, what does carbon do to the atmosphere ?

Answer 41

Carbon particulates that have been released cause global dimming like smog.

Question 42

What is ethanol?

Answer 42

Ethanol is a biofuel as it is made trough fermentation of plants which is an alternative fuel

Question 43

Pros and cons of biodiesel are

Answer 43

Adv. carbon neutral / engines don't need to be converted / less sulphur dioxide released Dis. Can't make enough / expensive to make / increases food prices

Question 44

Why is hydrogen such a good idea ? What is its one big problem ?

Answer 44

Hydrogen is everywhere - in water ! However it costs a lot to split it as it needs a lot of energy.