U3-4 and 3-5 - Nuclear Chemistry and Chemical Analysis

Question 1

How are heavier elements formed in stars?

Answer 1

From lighter elements via nuclear fusion.

Question 2

Nuclear fusion

Answer 2

A reaction where two or more atoms join to form one or more heavier atoms.

Question 3

Background radiation

Answer 3

Radiation that is all around us.

Question 4

Give one example of a natural radiation source.

Answer 4

Any one of:

cosmic rays, rocks and soil, living things.

Question 5

Give one example of an artificial radiation source.

Answer 5

Any one of:

medical sources, radioactive fallout, radioactive waste

Question 6

Chemical test for carbon dioxide

Answer 6

Limewater turns from clear to cloudy

(limewater = calcium hydroxide solution)

Question 7

Chemical test for hydrogen

Answer 7

Burns with a (squeaky) pop

Question 8

Chemical test for water

Answer 8

Turns cobalt chloride paper from blue to pink

Question 9

How can you test which metal ion is present in a salt?

Answer 9

Flame test

(flame will change colour depending on metal ion, e.g. lithium = red flame)

Question 10

What technique can be used to separate an ink mixture into different colours?

Answer 10

Chromatography

Question 11

Chemical test for oxygen

Answer 11

Relights a glowing split