Elements, Compounds, and Mixtures

Question 1

Combining power of OH

Answer 1

1

Question 2

Combining power of NH4

Answer 2

1

Question 3

Combining power of NO3

Answer 3

1

Question 4

Combining power of SO4

Answer 4

2

Question 5

Combining power of CO3

Answer 5

2

Question 6

Combining power of PO4

Answer 6

3

Question 7

Physical test for pure water

Answer 7

Heat water, see if it boils at exactly 100 degrees

Question 8

Simple distillation

Answer 8

The process of removing a solvent from a mixture by heating the mixture up and separating it when the solvent forms a vapour. The vapour is then cooled in a condenser to form a liquid again.

Question 9

Fractional distillation

Answer 9

The process of separating a mixture of substances with different boiling points. The mixture is heated to the boiling point of one substance which rises up as a vapour and is subsequently cooled into a liquid by the condenser.

Question 10

Filtration

Answer 10

The process of removing solid particles from a liquid by passing it through a filter medium.

Question 11

Crystallisation

Answer 11

The process of separating a dissolved solid from a liquid by heating it up and creating a vapour. Different to distillation because you lose the liquid.

Question 12

Paper chromatography

Answer 12

The process of separating a mixture by placing a solvent at the bottom of a filter paper. Place a dot of the mixture on the filter paper on a pencil line. As the solvent soaks the paper in an upward motion, the mixture dot is separated into two pure substance dots on the same vertical line.

Question 13

Reading a chromatogram

Answer 13

When the mixture dot has been separated, if one of the pure substance dots has moved further up the line, it is more soluble. The initial dot mixture has been separated into substances of different solubilities.

Question 14

Charges of compound ions

Answer 14

All ions except NH4 have negative charges relative to their combining power (NH4 is positive to its combining power)