C1 - Atomic structure & The Periodic Table

Question 1

What is an Element?

Answer 1

A substance where all of the atoms are the same (made of one type of atom)

Question 2

What is a compound?

Answer 2

A substance made up of two or more different elements chemically combined in fixed proportions.

Question 3

What is a mixture?

Answer 3

Different elements or compounds that are not chemically combined.

Question 4

What is a molecule?

Answer 4

Any elements chemically combined even if they’re the same element

Question 5

What are the 2 stages of simple distillation

Answer 5

1. Evaporate the liquid by heating.
2. Condense the vapour back to a liquid by cooling.

Question 6

In Chromatography, what is the stationary phase (1), and the mobile phase (2)?

Answer 6

1. Paper - It does not move.
2. Solvent - moves up the paper.

Question 7

What does a pure compound (1) and a compound in a mixture (2) look like when chromatography has taken place?

Answer 7

1) Singular spot in all solvents.
2) Separate into different spots depending on the solvent.

Question 8

Why do we draw the starting line in pencil when carrying out chromatography?

Answer 8

If we drew the line in pen, the pen ink could dissolve in the solvent and move up the paper.