Ion Theory Flashcards

1
Q

An anion is:

A

A negatively charged atom

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2
Q

An anion is:

A

A negatively charged chloride atom (Cl-)

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3
Q

A cation is:

A

A positively charged sodium atom (Na+)

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4
Q

An electrolyte is:

A

A substance which, dissolved in water, splits into ions

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5
Q

Examples of electrolytes are:

A

Acids and salts

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6
Q

An example of an electrolyte is:

A

Salt-solution

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7
Q

An acid is an electrolyte because:

A

It can conduct an electric current

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8
Q

An example of an inorganic acid is:

A

Sulphuric acid

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9
Q

An alkali must contain:

A

Metal atoms and hydroxyl group(s) (OH)

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10
Q

An example of an alkaline substance is:

A

Soap

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11
Q

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

A

An alkali

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12
Q

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

A

Alkalinity

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13
Q

pH can be decreased by:

A

Increasing hydrogen-ions

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14
Q

The letter p in pH means:

A

Potential

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15
Q

pH is:

A

The number of free H-ions in a solution

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16
Q

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

17
Q

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

A

Strong acid

18
Q

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

A

Weak alkali

19
Q

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

A

Strong alkali

20
Q

The pH of distilled water is:

21
Q

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

22
Q

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

23
Q

Substances having a pH value above 9.5 are considered to be

24
Q

The pH of the skins acid mantle is:

25
A characteristic of a weak acid is that it:
Supports the natural pH of the skin
26
A characteristic of a weak alkali is that it:
Softens the stratum corneum of the skin
27
The effect of a strong acid is:
Corrosive and therefore of no use in beauty therapy
28
A characteristic of organic acids is that:
They contain the element carbon (C)
29
Organic acids are found in
Sebum and plants
30
An organic acid contains the chemical-group:
COOH
31
An anode is:
A positively charged electrode
32
A cathode is:
A negatively charged electrode
33
Examples of electrodes which are used in beauty therapy are:
The needles used for galvanic electrolysis