Chemistry, 10 points. 5 question!
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Chemistry, 10 points. 5 question!

[From: ] [author: ] [Date: 12-07-18] [Hit: ]
When the amount of a radioactive substance is reduced by half, what has occurred?5. Which of the following distinguishes a nuclear reaction from a chemical reaction?It involves atoms.There is an exchange of electrons.......
Protons and neutrons are made from which of the following particles?
up quarks only

down quarks only

up quarks and down quarks

hadrons



2. Which of the following is the measure of radioactive decay rate?
alpha emission

half-life

beta emission

gamma emission



3. Which of the following radioisotopes is naturally occurring?
94^238Pu

1^3H

103^258Lr

96^242Cm



4. When the amount of a radioactive substance is reduced by half, what has occurred?
alpha radiation

beta radiation

a half-life

gamma radiation



5. Which of the following distinguishes a nuclear reaction from a chemical reaction?
It involves atoms.

There is an exchange of electrons.

There is a change in the nucleus.

Mass is conserved.

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Hey there, This is more physics but who cares :),
1: Up down quarks.
2: Half life
3:To be honest none of them are but 1^3H
4: A half Life
5:There is a change in the nucleus.

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1. up quarks and down quarks

2. half-life

3. 1^3H

4. a half-life

5. There is a change in the nucleus.
1
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