Matter
Which state of matter has a definite shape and definite volume?
Solid
What is the smallest unit of an element called?
Atom
Is melting ice a physical or chemical change?
Physical Change
What pH number is considered neutral?
7
True or False: Healthy hair and skin are generally slightly acidic.
True
Which state of matter takes the shape of its container but keeps a definite volume?
Liquid
Which atomic particle has a positive charge?
Proton
Is rusting iron a physical or chemical change?
Chemical Change
Is a substance with a pH of 3 acidic or alkaline?
Acidic
What part of the hair is affected when an alkaline product causes it to swell?
Cuticle
Which state of matter has neither a definite shape nor a definite volume?
Gas
Where are electrons found within an atom?
In the electron cloud or "shells" (orbiting the nucleus)
Name one sign that a chemical change has occurred.
Color change, gas production, heat/light produced, precipitate formation
What happens to a substance as its pH moves farther away from 7 toward 0?
It becomes more Acidic
Would a conditioner typically have a lower or higher pH than a relaxer?
Lower pH
What state of matter is water in when it is frozen into ice?
Solid
What do you call a substance made of two or more elements chemically combined?
Compound
Is dissolving sugar in water a physical or chemical change?
Physical Change
Which is more acidic: pH 2 or pH 5?
pH 2
Why are acidic products often used after chemical services?
To help close and smooth the cuticle and restore pH balance.
A hairstylist notices steam rising from a hot towel. What state change is taking place?
Liquid to Gas (aka Evaporation)
An atom has 12 protons, 12 neutrons, and 12 electrons. What is its atomic number?
12
A stylist cuts a client's hair and then colors it. Which service causes a physical change and which causes a chemical change?
Cutting the hair is a physical change
Coloring the hair is a chemical change
A product changes from pH 8 to pH 5. Did it become more acidic or more alkaline?
More Acidic
Is a relaxer with a pH of 13 closer to the hair's healthy/natural pH or farther away?
Further