2C - Moles definitions

Question 1

Amount of a substance

Answer 1

The quantity

Unit = Mole

Question 2

Mole

Answer 2

The amount of any substance containing as many particles as there are in exactly 12g of the Carbon-12 isotope

Question 3

Avogadro’s constant

Answer 3

(N_A)

The number of atoms per mole of the Carbon-12 isotope

6.02 x 10²³

Question 4

Molar mass

Answer 4

Mass per mle of a substance.

Unit = g/mol (g mol^-1)

Question 5

Empirical formula

Answer 5

The simplest whole-number ratio of atoms of each element present in a compound

Question 6

Molecular formula

Answer 6

The actual number of atoms of each element in a compound

Question 7

1-Anhydrous

2-Hydrated

Answer 7

1-A substance containing NO water molecules

2-A substance containing water molecules

Question 8

Water of crystallisation

Answer 8

Water molecules that form an essential part of the crystalline structure of a compound

Question 9

Concentration

Answer 9

The amount of solute, in mol per 1 dm³ of solution

Question 10

Standard solution

When are they used?

Answer 10

A solution of known concentration.

Standard solutions are normally used in titrations to determine unknown information about another substance.

Question 11

1-Solute

2-Solvent

3-Solution

Answer 11

1-The solid that dissolves

2-the liquid that the solute dissolves into

3-A solute dissolved into a solvent