Ion Theory

Question 1

An anion is:

Answer 1

A negatively charged atom

Question 2

An anion is:

Answer 2

A negatively charged chloride atom (Cl-)

Question 3

A cation is:

Answer 3

A positively charged sodium atom (Na+)

Question 4

An electrolyte is:

Answer 4

A substance which, dissolved in water, splits into ions

Question 5

Examples of electrolytes are:

Answer 5

Acids and salts

Question 6

An example of an electrolyte is:

Answer 6

Salt-solution

Question 7

An acid is an electrolyte because:

Answer 7

It can conduct an electric current

Question 8

An example of an inorganic acid is:

Answer 8

Sulphuric acid

Question 9

An alkali must contain:

Answer 9

Metal atoms and hydroxyl group(s) (OH)

Question 10

An example of an alkaline substance is:

Answer 10

Soap

Question 11

If a metal-oxide is dissolved in water it forms:

Answer 11

An alkali

Question 12

The pH scale is used to measure the degree of acidity or:

Answer 12

Alkalinity

Question 13

pH can be decreased by:

Answer 13

Increasing hydrogen-ions

Question 14

The letter p in pH means:

Answer 14

Potential

Question 15

pH is:

Answer 15

The number of free H-ions in a solution

Question 16

If the pH of a solution is between 5 and 7, the solution is a

Answer 16

Weak acid

Question 17

If the pH of a solution is between 1 and 3 the solution is a:

Answer 17

Strong acid

Question 18

If the pH of a solution is between 7 and 9 the solution is a:

Answer 18

Weak alkali

Question 19

If the pH of a solution is between 12 and 14 the solution is:

Answer 19

Strong alkali

Question 20

The pH of distilled water is:

Answer 20

7

Question 21

Lemon juice, with a pH reading of about 2, is considered to be:

Answer 21

Acid

Question 22

Pure water with a pH of 7, is considered to be

Answer 22

Neutral

Question 23

Substances having a pH value above 9.5 are considered to be

Answer 23

Alkaline

Question 24

The pH of the skins acid mantle is:

Answer 24

5.5

Question 25

A characteristic of a weak acid is that it:

Answer 25

Supports the natural pH of the skin

Question 26

A characteristic of a weak alkali is that it:

Answer 26

Softens the stratum corneum of the skin

Question 27

The effect of a strong acid is:

Answer 27

Corrosive and therefore of no use in beauty therapy

Question 28

A characteristic of organic acids is that:

Answer 28

They contain the element carbon (C)

Question 29

Organic acids are found in

Answer 29

Sebum and plants

Question 30

An organic acid contains the chemical-group:

Answer 30

COOH

Question 31

An anode is:

Answer 31

A positively charged electrode

Question 32

A cathode is:

Answer 32

A negatively charged electrode

Question 33

Examples of electrodes which are used in beauty therapy are:

Answer 33

The needles used for galvanic electrolysis