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N5 Chemistry Revision > Unit 3 > Flashcards

Unit 3 Flashcards

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1
Q

What do plants need to grow?

A

Nitrogen phosphorus and potassium

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2
Q

Plants can get these from?

A

Fertilisers or synthetic fertilisers.

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3
Q

Synthetic fertilisers are made using neutralisation reactions this is?

A

Acid + Base –——> salt + water

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4
Q

How do you calculate percentage composition?

A

Total mass of an element divided by the GFM of compound times by 100 gives you your percentage.

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5
Q

Ammonia is made using the ……process

A

Haber

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6
Q

The reaction for this is?

A

N2 + 3H2 ———> 2NH3

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7
Q

What does the double Arrow mean?

A

That the reaction is reversible

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8
Q

The catalyst used in the process is?

A

Iron metal

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9
Q

Nitric acid is made using the ……….process

A

Ostwald

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10
Q

The catalyst used in this reaction is?

A

Platinum

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11
Q

Radiation can be measured using a?

A

Geiger counter

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12
Q

Name the three types of radiation

A

Alpha
Beta
Gamma

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13
Q

What type of radiation is the weakest and what is the strongest?

A

Alpha to Gamma

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14
Q

What is nuclear reactions?

A

Nuclear reactions as the fusion of nucleuses to form new elements

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15
Q

What is radioactive decay?

A

When a radioisotope emits radiation it’s nucleus changes this is known as a radioactive decay

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16
Q

What happens when it decays ?

A

Its mass and activity decrease

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17
Q

What is meant by the term half life?

A

Half life is the time taken for the mass or activity of a radio isotope to decrease by half

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18
Q

How to calculate half life value

A

Half life = time Divided by the number of half lives

19
Q

Uses for radio isotopes

A

Cobalt 60 used to treat cancer

Carbon-14 dating used to determine the age of remains of objects that once lived

Gamma or better sources used to measure the thickness of paper

20
Q

Qualitative tells you what?

A

Is present

21
Q

You can do this by using?

A

Flame tests
precipitation
chromatography

22
Q

Quantitative tells you what

A

How much is present

23
Q

You can do this by using?

A

Acid or base traditions gravimetric analysis

24
Q

Metal plus oxygen equals?

A

Metal oxides

25
Q

Metals react with water to produce?

A

Metal hydroxide plus hydrogen

26
Q

Metals react with acid to produce?

A

Metal salt plus hydrogen

27
Q

Thermal plastics are polymers that can be what when he did?

A

Reshaped

28
Q

What cannot be reshaped by heating?

A

Thermosetting polymer

29
Q

Monomers join together to form a polymer in watch reaction?

A

Addition polymerisation

30
Q

The reactivity series shows what a metal is?

A

Reactive

31
Q

At the top you have to use?

A

Electrolysis

32
Q

In the middle you use?

A

Heat with carbon

33
Q

At the bottom you use?

A

Heat alone

34
Q

What is electrolysis

A

Electrolysis is when you break compound using electricity

35
Q

What is a reduction reaction

A

A reduction reaction is when ions gain electrons to become elements

36
Q

What is an oxidation reaction?

A

An oxidation reaction is when elements lose electrons to form ions

37
Q

What is a redox reaction?

A

A redox reaction is a combination of oxidation and reduction reactions

38
Q

A cell is made up of?

A

Two metal is separated by an electrolyte

39
Q

What is an electrolyte?

A

And electrolyte as an ionic solution or paste

40
Q

Where do electrons flow and where do ions for?

A

Electrons flow and wires and ions flow in the electrolytes

41
Q

Electrons flow from the metal…… in the electrochemical series to the metal ……

A

Higher to lower

42
Q

What is a half cell?

A

Half cell consists of metal dipped into a solution of it’s own Ions

43
Q

The Ion bridge is there for what reason?

A

It allows the ions to flow complete in the circuit

44
Q

What are polymers

A

Polymers is a long chain made up of small units called monomers

N5 Chemistry Revision (3 decks)

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