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