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YEAR 9 - Chemistry > Booklet 2 > Flashcards

Booklet 2 Flashcards

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1
Q

Why do bubbles sometimes pass through a liquid when you first start to heat it?

A

Some atmospheric gases which expand in test tubes get caught in the substance

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2
Q

What is the chemical name for limewater?

A

Calcium Hydroxide

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3
Q

What is the gas given off in the thermal decomposition of copper carbonate?

A

Carbon Dioxide CO2

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4
Q

What colour is copper carbonate before thermal decomposition and the colour of the solid after heating?

A

Green powder before

Black powder after

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5
Q

Colour of copper nitrate before heating and the colour of solid after heating?

A

Blue before heating

Black after heating

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6
Q

What colour is nitrogen dioxide gas?

A

Brown

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7
Q

What does mg m3 mean?

A

The mg per m cubed

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8
Q

What gases are made in copper nitrate thermal decomposition?

A

Nitrogen dioxide+Oxygen

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9
Q

Name the maximum number of electrons on the first 3 shells?

A

2,8,8

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10
Q

What is in the centre of an atom cluster?

A

Neutrons and protons

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11
Q

What is the relative mass of a proton, neutron, and electron?

A

1,1,0.0005

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12
Q

Why are atoms neutral?

A

The number of electrons are the same amount of protons

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13
Q

What is the superscript number on a element?

And what is the subscript number on a element?

A

Top:Relative atomic mass
Bottom:Atomic number

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14
Q

How do you work out the number of neutrons in an atom?

A

Mass number-atomic number

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15
Q

What process is aluminium extracted by?

A

Electrolysis

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16
Q

What is Aluminium extracted from?

A

Alumina

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17
Q

Why can Aluminium not be extracted using carbon?

A

Aluminium is more reactive than carbon

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18
Q

What do aluminium ions gain to make aluminium metal?

A

Electrons

19
Q

What chemical is added to alumina to lower the melting point?

A

Cryolite

20
Q

Cathode+Anode=_______

A

Graphite

21
Q

Electrolyte=__________

A

Alumina+Cryolite

22
Q

What is an electrolyte?

A

Solution or molten substance to be electrolysed

23
Q

What is a cell?

A

A container in which electrolysis takes place

24
Q

What is an anode?

A

A positive electrode

25
Q

What is an cathode?

A

A negative electrode

26
Q

How is nitrogen dioxide produced every day?

A

Vehicle exhausts/burning fossil fuels

27
Q

What problem can be caused by nitrogen oxides in the air?

A

Increasing likeliness of breathing problems

28
Q

Is it dangerous to breathe near roads because of nitrogen oxides?

A

It is a little less healthy but not very dangerous unless you already have a respiratory problems such as asthma

29
Q

In electrolysis what happens when solutions conduct electricity?

A

Products form at the anode and the cathode

30
Q

What happens if Copper chloride is used in electrolysis?

A

Cathode: Copper
Anode: Chlorine

31
Q

What is most reactive copper or sodium?

A

Sodium

32
Q

What is a patten at the cathode and the position of the metal in the reactivity series?

A

If a metal is less reactive than hydrogen it forms at the cathode.

33
Q

What type of particle is attracted to the cathode?

A

Positively charged cations

34
Q

What type of particle is attracted to the anode?

A

Negatively charged anions

35
Q

What particle must be in tap water?

A

Neutral

36
Q

Positive ions tend to be what and are attracted where?

A

Metals and attracted to the negative electrode

37
Q

What type of substance’s ions are negative and attracted to a positive electrode?

A

Non-metals

38
Q

Why do they use molten Aluminium instead of an aqueous solution?

A

Aluminium is more reactive than Hydrogen

39
Q

Define decomposition

A

The breaking down of a compound into simpler compounds or elements

40
Q

What do non-electrolytes consist of and do they conduct electricity?

A

They do not conduct electricity as they consists of molecules which are not electricity charged and do not move towards the electrodes

41
Q

What is electrolysis?

A

Decomposition by passing a current through a substance

42
Q

Why was gold one of the first metals used by man?

A

As it is not very reactive so it can be found in its native form and does not need to be extracted

43
Q

What is a native metal?

A

A metal in its natural form not combined with other elements

44
Q

Why were certain metals like magnesium not mass produced until the 20th century?

A

As they have to be extracted by electricity only widely available in the 20th century

YEAR 9 - Chemistry (7 decks)

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