FREE Milady Principles of Chemistry Questions and Answers

Question 1

What is the simplest form of chemical matter that cannot be broken down into a simpler substance without loss of identity?

Accepted Answer

Element

Answer

An element is the basic building block of all matter and cannot be chemically broken down. Atoms are the particles from which all matter is composed, but an element is the simplest form of that chemical matter. Molecules are formed when two or more atoms are joined together chemically.

Question 2

A stable physical mixture of two or more substances is a(n):

Accepted Answer

Solution

Answer

A solution is a stable mixture where the solute is dissolved in a solvent and will not separate over time. Suspensions contain larger, undissolved particles that can separate. Emulsions are mixtures of immiscible substances held together by a binder.

Question 3

What is the term for a substance that allows oil and water to mix, or emulsify?

Accepted Answer

Surfactant

Answer

A surfactant is a molecule that has a water-loving (hydrophilic) head and an oil-loving (lipophilic) tail. This unique structure allows it to act as a bridge between oil and water, creating a stable emulsion. This is the principle behind soaps and detergents.

Question 4

On the pH scale, a reading of 8 indicates that a solution is:

Accepted Answer

Alkaline

Answer

The pH scale ranges from 0 to 14, with 7 being neutral. Any substance with a pH below 7 is considered acidic, while any substance with a pH above 7 is considered alkaline (or basic). Therefore, a pH of 8 is slightly alkaline.

Question 5

The chemical reaction that combines a substance with oxygen to produce an oxide is known as:

Accepted Answer

Oxidation

Answer

Oxidation is a chemical process that involves the loss of electrons or an increase in oxidation state, often by combining with oxygen. Rusting iron is a common example of oxidation. Reduction is the opposite process, involving the gain of electrons.

Milady Cosmetology Practice Test

Milady Cosmetology Practice Test

FREE Milady Principles of Chemistry Questions and Answers