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.