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Chemisty > Topic 12 > Flashcards

Topic 12 Flashcards

1
Q

Examples of non-radioactive radiation in the envirnoment

A

Ultraviolet

Sound waves

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2
Q

Examples of background radiation

A

Cosmic rays

Radon gas in rocks

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3
Q

What does a chemical change always involve

A

A new substance being involved

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4
Q

What does a nucleus change always involve

A

A new element being formed

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5
Q

Non ionising radiation

A

Radiation threat does NOT create ions in the material being exposed to the radiation

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6
Q

Ionising radiation

A

Radiation powerful enough to form ions and so destroy the material being exposed

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7
Q

Examples of non using radiation

A

Ultr violet

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8
Q

Examples of ionising radiation

A

Gamma radiation

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9
Q

Types of radiation

A

Alpha
Beta
Gamma

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10
Q

Alpha radiation

A 
Helium nucleus
Charge - 2+
Extremely ionising
Mass - 4
Absorbed by paper
He2+
Least penetrating
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11
Q

Beta

A 
Fast moving electron
-e
Charge - -1
Mass -0
Absorbed by aluminium
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12
Q

Gamma radiation

A 
Electromagnetic wave
Y
charge - 0
Mass - 0
Least ionising
Most penetrating
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13
Q

How is beta particles formed

A

Splitting up of the neuron into a proton and electron

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14
Q

Non-particulate

A

Not made up of a stream of particles

Eg gamma

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15
Q

What radiation is not effected when passes through an electric feels with positively and negatively charged plates

A

Gamm radiation

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16
Q

What radiation is attracted to posively charged plates

A

Beta

17
Q

What radiation is attracted to the negatively charged plate

A

Alpha

18
Q

Radioistope

A

An isotope which can undergo radioactive decay

19
Q

Half - life

A

The time it takes for half the nuclei of a particular isotope to decay

20
Q

Carbon dating

A

Masses the amount of carbon-14 present in a sample nd using relative proportions of the carbon 12 and carbon -14 isotopes to calculate the age of a sample

21
Q

Uses of radio isotopes in medicine

A

Cobalt - 60 - gamma emitter used to treat deep- seated cancerous tumours

Iodine - detect problems in the thyroid gland

22
Q

When using radioistope in medicine should the radioistope have a long or short half life

A

Shorty half life to avoid long exposure to radiation internally

23
Q

Radioistopes in industry

A

To date materials

To detect flow pterrns of :
Oil
Gas
Water pipelines

Smoke detectors

Chemisty (18 decks)

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