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Nat 5 chemistry - A.Clarke > Unit 3- NUCLEAR CHEMISTRY > Flashcards

Unit 3- NUCLEAR CHEMISTRY Flashcards

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1
Q

What does alpha radiation consist of?

A

Two protons and two neutrons

Carry a double positive charge

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2
Q

What is alpha particles attracted to?

A

Negatively charged plate

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3
Q

what is the symbols for an alpha particle?

A
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4
Q

What is beta radiation attracted to?

A

Positively charged plate

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5
Q

In beta radiation what does the neutron break down to?

A

A neutron changes into a proton

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6
Q

What happens to the electrons in beta radiation?

A

Ejected from the nucleus of an atom

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7
Q

What is gamma radiation

A

Electromagnetic waves from the nucleus of an atom

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8
Q

What is gamma radiation attracted to?

A

nothing, not deflected by an electric field

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9
Q

What is the travel distance of alpha radiation and what can stop it?

A

few cm, it can be stopped by piece of paper

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10
Q

What is the travel distance of beta radiation and what can stop it?

A

over a meter in air stopped by sheet of aluminium

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11
Q

What is the travel distance of gamma radiation and what can stop it?

A

Great distance in air, stopped by barriers made of materials such as lead or concrete

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12
Q

What is a half life?

A

Time taken for the activity to decrease by half

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13
Q

What is the symbols for a beta particle?

A
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14
Q

Which particle will be formed when an atom of 239U emits a Beta particle?

A

239 Np

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15
Q

Which particle will be formed when an atom of 226Ra emits an alpha particle?

A

222Rn

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16
Q

A sample of Polonium-208 has a mass of 6g. It is a gamma-emitting radioisotope with a half life of 3 years.

Calculate the mass, in grams, of Polonium-208 that would be left after 15 years.

A

year 0 –> 6g

year 3 –> 3g

year 6 –> 1.5g

year 9 –> 0.75g

year 12 –> 0.375g

year 15 –> 0.1875g

17
Q

A sample of Tungstem-185 has an original mass of 40g.

After 300 days, 2.5g of the sample is left.

What is the half life of Tungstem-185 ?

A

day 0 –> 40g

day ? –> 20g

day ? –> 10g

day ? –> 5g

day ? –> 2.5g –> 300days

300days / 4 = 75 days

Nat 5 chemistry - A.Clarke (11 decks)

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