This particle of an atom has a negative charge.
electron
This type of matter has a definite weight, shape, and volume.
solid
The bonds found within the hair that help organize protein chains are called this.
side bonds
If a product is pH balanced, that means it has this pH level.
4.5 to 5.5
This is used for the most accurate reading of pH.
pH meter
Atoms that are the same combine to form this.
element
This element is the most abundant in the earth's crust, and is the second most abundant in the earth's atmosphere.
Oxygen
Carbon, nitrogen, oxygen, and hydrogen form the basis of this.
amino acids
Blue litmus paper turns this color when placed in an acid.
red
On the pH scales, numbers less than 7 indicate this.
acidic solution
This atomic structure is the simplest, and has an elemental number of 1.
hydrogen
liquid
When amino acids combine to form the protein of the hair, they take on this shape.
spiral
A pH of 5 is this many times more acidic than a pH of 6.
10
If a solution has an equal number of hydrogen (+) and hydroxide (-) ions, then it is considered this.
neutral
This is formed when two of the same atoms are joined together by a chemical bond.
molecule
gas
This side bond is of the greatest concern to the salon professional.
disulfide bond
If distilled water is neutral, then it has a pH of this.
7
alkaline
This term is used to identify anything that occupies space and has weight.
matter
This describes how human hair is formed: the bonding of ______ _____ to other ______ _____.
protein chains to other protein chains
This is the pH range of hair, skin, and nails.
4.5 to 5.5
Substances of acidic or alkaline nature dissolve in, or contain, this.
water
This particle of an atom has no charge, but gives the atom its weight.
This is created when amino acids join together in chains.
proteins
These two bonds are affected when creating a physical change in the hair, such as with wet-setting or heat styling.
hydrogen and salt
Red litmus paper turns this color when placed in an alkali.
blue
Soaps tend to be this.
alkaline
Water contains two hydrogen atoms and one of this type of atom.
oxygen
This division of chemistry pertains to all carbon-based matter, now living or having lived at one point.
organic chemistry
These type of bonds amino acids together end to end to create proteins.
peptide bonds
Sodium Hydroxide relaxers fall in this level of pH.
11.5 to 14
This word is used to describe the way alkalis tend to taste.
bitter