Atomic Structure

Question 1

What is a mixture?

Answer 1

A mixture is made up of two or more substances that are not chemically combined together

Question 2

How can mixtures be separated?

Answer 2

Mixtures can be separated by physical means such as filtration, crystallisation and simple distillation

Question 3

What is fractional distillation?

Answer 3

Fractional distillation is an effective way of separating miscible liquids using a fractioning column. The separation is possible because of the different boiling points of the liquids in the mixture.

Question 4

What us paper chromatography?

Answer 4

Paper chromatography separates mixtures of substances dissolved in a solvent as they move up a piece of chromatography paper. The different substances are separated because of their solubilities in te solvent used.

Question 5

What are atoms made up of?

Answer 5

Protons
Neutrons
Electrons

Question 6

What happens when an atom gains an electron?

Answer 6

Atoms that gain electrons form negative ions. If atoms lose electrons they form positive ions.

Question 7

What are isotopes?

Answer 7

Isotopes are atoms of the same element with different numbers of neutrons. They have identical chemical properties, but their physical properties like density can differ.

Question 8

How are electrons arranged?

Answer 8

Electrons are arranged in energy levels or shells. The lowest level contains 2 electrons. The higher levels contain 8 electrons.