Ion Theory Flashcards
An anion is:
A negatively charged atom
An anion is:
A negatively charged chloride atom (Cl-)
A cation is:
A positively charged sodium atom (Na+)
An electrolyte is:
A substance which, dissolved in water, splits into ions
Examples of electrolytes are:
Acids and salts
An example of an electrolyte is:
Salt-solution
An acid is an electrolyte because:
It can conduct an electric current
An example of an inorganic acid is:
Sulphuric acid
An alkali must contain:
Metal atoms and hydroxyl group(s) (OH)
An example of an alkaline substance is:
Soap
If a metal-oxide is dissolved in water it forms:
An alkali
The pH scale is used to measure the degree of acidity or:
Alkalinity
pH can be decreased by:
Increasing hydrogen-ions
The letter p in pH means:
Potential
pH is:
The number of free H-ions in a solution
If the pH of a solution is between 5 and 7, the solution is a
Weak acid
If the pH of a solution is between 1 and 3 the solution is a:
Strong acid
If the pH of a solution is between 7 and 9 the solution is a:
Weak alkali
If the pH of a solution is between 12 and 14 the solution is:
Strong alkali
The pH of distilled water is:
7
Lemon juice, with a pH reading of about 2, is considered to be:
Acid
Pure water with a pH of 7, is considered to be
Neutral
Substances having a pH value above 9.5 are considered to be
Alkaline
The pH of the skins acid mantle is:
5.5
A characteristic of a weak acid is that it:
Supports the natural pH of the skin
A characteristic of a weak alkali is that it:
Softens the stratum corneum of the skin
The effect of a strong acid is:
Corrosive and therefore of no use in beauty therapy
A characteristic of organic acids is that:
They contain the element carbon (C)
Organic acids are found in
Sebum and plants
An organic acid contains the chemical-group:
COOH
An anode is:
A positively charged electrode
A cathode is:
A negatively charged electrode
Examples of electrodes which are used in beauty therapy are:
The needles used for galvanic electrolysis
