Unit 3.4 Nuclear Chemistry Flashcards Preview

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Flashcards in Unit 3.4 Nuclear Chemistry Deck (21):
1

What is radioactivity?

The result of unstable nuclei emitting energy or a particle to form more stable nuclei

2

What are the different types of radiation?

-Alpha
-Beta
-Gamma

3

What properties does alpha radiation have?

Slow moving,positively charged particles that come from the nucleus of a radioactive element

4

What does Alpha radiation consist of?

Two protons and Two neutrons with a 2+ charge

5

What level of penetration does Alpha have?

Little penetration and will be stopped by a few cm of air or a sheet of paper

6

Nuclear decay with the emission of an Alpha particle

232 228 4 2+
Th - - - - > Ra + He^
90 88 2

7

What are Beta Particles?

Electrons

8

What are the particles in Beta radiation like?

Fast moving, negatively charged particles, formed when a neutron from the nucleus splits into a proton and an electron

9

What is the penetration like in Beta Particles?

They have a greater penetration than Alpha and can pass through air but can't penetrate thin metal foil

10

What does the nuclear equation for Beta decay create?

A product with an atomic number that has increased but the mass number is unchanged

11

Example of a Beta decay nuclear question?

228 228 0
Ra---> Ac+ e
88 89 - 1

12

What is Gamma radiation?

Non-particle, it's not a particle but a form of electromagnetic radiation of high energy

13

What does the non particulate nature of Gamma waves mean?

They do not change the nature of an atom, so there are no nuclear equations for Gamma radiation

14

What is the penetration like in Gamma radiation?

The greatest penetration of the three types of radioactivity and thick lead or concrete is required to absorb Gamma Rays

15

The nature of the Beta Particle

Negatively charged so is attracted to the positively charged plate

16

The nature of the Alpha particle

Positively charged, so attracted to the negatively charged particle

17

Nature of Gamma waves

No charge because they are Non-particulate, so aren't affected by any of the charged plates

18

Uses of radioisotope Gamma emitter cobalt-60

The treatment of tumours

19

Uses of radioisotope, less penetrating Beta emitter phosphorus-32

Treatment of skin cancer

20

Uses of radioisotopes with a short half life

-Leaks in pipelines can be investigated
-The radiation emitted can be detected if a leak is present

21

Uses of radioisotope Americium-241

-Domestic smoke alarms
-small amounts of smoke can affect the amount of radiation passing through a small gap and an alarm is triggered