U3-4 - Nuclear Chemistry

Question 1

Nuclear radiation is emitted from the _______of a radioactive isotope and may be in the form of particles or waves.

Answer 1

nucleus

Question 2

Radioactive isotope (radioisotope)

Answer 2

An isotope with an unstable nucleus that undergoes nuclear decay.

Question 3

Why do nuclei emit radiation?

Answer 3

To become more stable.

Question 4

Alpha radiation consists of ____________.

Answer 4

Alpha radiation consists of helium nuclei.

Question 5

_________ radiation consists of helium nuclei.

Answer 5

Alpha radiation consists of helium nuclei.

Question 6

Nuclide notation for alpha particles

Answer 6

Question 7

Beta radiation consists of __________.

Answer 7

Beta radiation consists of high speed electrons.

Question 8

______ radiation consists of high speed electrons.

Answer 8

Beta radiation consists of high speed electrons.

Question 9

Nuclide notation for beta particles

Answer 9

Question 10

Gamma radiation consists of _________.

Answer 10

Gamma radiation consists of electromagnetic waves.

Question 11

______ radiation consists of electromagnetic waves.

Answer 11

Gamma radiation consists of electromagnetic waves.

Question 12

Alpha radiation can be stopped by ___________.

Answer 12

Alpha radiation can be stopped by a sheet of paper.

Question 13

________ radiation can be stopped by a sheet of paper.

Answer 13

Alpha radiation can be stopped by a sheet of paper.

Question 14

Beta radiation can stopped by ________.

Answer 14

Beta radiation can stopped by a thin sheet of aluminium.

Question 15

_____ radiation can stopped by a thin sheet of aluminium.

Answer 15

Beta radiation can stopped by a thin sheet of aluminium.

Question 16

Gamma radiation can be stopped by ________.

Answer 16

Gamma radiation can be stopped by a thick slab of lead or concerete.

Question 17

______ radiation can be stopped by a thick slab of lead or concerete.

Answer 17

Gamma radiation can be stopped by a thick slab of lead or concerete.

Question 18

Label the paths (alpha, beta, gamma).

Answer 18

Question 19

Finish the alpha decay equation:

Answer 19

Question 20

During alpha decay, the mass number __________.

Answer 20

During alpha decay, the mass number decreases by 4.

Question 21

During ______ decay, the mass number decreases by 4.

Answer 21

During alpha decay, the mass number decreases by 4.

Question 22

During alpha decay, the atomic number ______.

Answer 22

During alpha decay, the atomic number decreases by 2.

Question 23

During ________ decay, the atomic number decreases by 2.

Answer 23

During alpha decay, the atomic number decreases by 2.

Question 24

Finish the beta decay equation:

Answer 24

Question 25

During beta decay, the mass number ______.

Answer 25

During beta decay, the mass number stays the same.

Question 26

During _____ decay, the mass number stays the same.

Answer 26

During beta decay, the mass number stays the same.

Question 27

During beta decay, the atomic number ___________.

Answer 27

During beta decay, the atomic number increases by 1.

Question 28

During _____ decay, the atomic number increases by 1.

Answer 28

During beta decay, the atomic number increases by 1.

Question 29

Half-life

Answer 29

The time it takes for half the nuclei of the starting element to decay.

Question 30

The time it takes for half the nuclei of the starting element to decay.

Answer 30

Half-life

Question 31

How can the rate of nuclear decay be increased?

Answer 31

It cannot - depends only on the specific isotope.