Milady CH7 Chemistry - Review Questions {match}
Which chemistry does not contain carbon? Organic or inorganic
Inorganic chemstry
Everything except ____ and _____ is as chemical
Light, electricity
Why is water important in skin care?
Only products that contain water can have have a pH
Why do you need to know the pH levels of the products you work with?
To help understand which products will be most beneficial to that skin type
what is hydrogen?
a colorless, odorless, tasteless has and is the lightest element known
What is matter?
any substance that occupies space and has mass (weight)
What are physical properties?
characteristics that can be determined without a chemical reaction and do not cause a chemical change
_______ are combinations of two or more atoms of different elements united chemically with a fixed chemical composition , definite proportions and distinct properties
chemical compound
Which changes the identity of the substance? Physical properties or chemical properties?
chemical properties
what is an example of oil in water emulsion and explain
cleansing lotion, because there is more water than oil it is easily removed with a wet cotton or sponge
what is an example of water in oil emulsion and explain
creams, because they remove grime and prevent moisture loss from the skin
Define molecule.
formed by joining two or more atoms chemically
This does not have a definite size or shape
gases
define emulsions
mixtures of two or more immiscible substances united with the aid of emulsifier
This makes up about four-fifths of the air in our atmosphere
nitrogen
moisturizing and cleansing lotions are examples of what?
oil in water emulsions
What is the difference between organic and inorganic chemistry?
one contains carbon and the other does not but may still have hydrogen
______ is the most abundant element found on earth, and is a colorless, odorless and tasteless gas
oxygen
What are atoms?
particles from which all matter is composed; the smallest particle of an element that still retains the properties of that element
_______ are a combination of two or more substances that are united physically in any proportions with combined properties
physical mixtures
_______ is the process through which oxygen is subtracted from or hydrogen is added to a substance through a chemical reaction
reduction
Define chemistry
science that deals with the composition, structure, and properties of matter and how matter changes under different conditions
liquids have a definite size but not a definite ____
shape
____ have a definite size and shape
solids
____ is a uniform mixture of two or more mutually mixable substances
solutions
an unstable mixture of two or more immiscible substances is called what?
suspensions
How can matter be changed?
temperature
explain the structure of oil in water emulsion
the droplets of oil are surrounded surfactants with their tails (lipophilic acid) pointing in and their heads (hydrophillic) pointing out
explain the structure of water in oil emulsion
the droplets of water are surrounded by surfactants with their head(hydrophilic) pointing in and their tails(lipophilic) pointing out
what is the difference between solutions, suspensions and emulsions?
the main difference between all depends on the size of the particles and the solubility of the components
What differentiates between solids, liquid and gases?
they all differ in size and shape
How are physical properties different from chemical properties?
they both require a different type of reaction where one can change the identity of the substance
cleasing creams, cold creams, night creams, massage creams, baby creams, suntan lotions, and hair grooming creams are all examples of what?
water in oil emulsions
What is the difference between a chemical compound and a physical mixture?
They are united differently and require different proportions and properties
Steam is an example of what?
a gas
Water is an example of what?
a liquid
Ice is an example of what?
a solid
Define pH
a substance is its relative degree of acidity or alkalinity and is measured on a scare of 0 to 14
what is oxidation?
an addition of oxygen or a loss of hydrogen
_______ is the simplest form of chemical matter
element
