chemistry test

Question 1

As the basic unit of matter, __________ cannot be divided into simpler substances by ordinary chemical means.

Answer 1

atoms

Question 2

__________, also known as alkalis, are compounds of hydrogen, a metal, and oxygen.

Answer 2

bases

Question 3

Volatile organic compounds contain __________ and evaporate very easily.

Answer 3

carbon

Question 4

Among the following choices, acids would MOST likely be used to __________.

Answer 4

exfoliate the skin

Question 5

The letters pH denote __________, which is the relative degree of acidity or alkalinity of a substance.

Answer 5

potential hydrogen

Question 6

What type of chemical reaction balances pH and results in the production of water and a salt?

Answer 6

acid–alkali neutralization

Question 7

The location you use for mixing chemicals must be __________.

Answer 7

well ventilated

Question 8

Water-in-oil emulsions feel __________ than oil-in-water emulsions.

Answer 8

greasier

Question 9

A(n) __________ charged ion is called an anion.

Answer 9

negatively

Question 10

Solutions that do not contain water, such as alcohol or oil, do not have ___________.

Answer 10

PH

Question 11

Which of the following is an example of a pure substance?

Answer 11

salt

Question 12

An unstable physical mixture of undissolved particles in a liquid, such as calamine lotion, is a:

Answer 12

suspension

Question 13

On a Safety Data Sheet (SDS), which category would include risks of exposure, related symptoms, and acute and chronic effects?

Answer 13

toxicological information

Question 14

________ is the chemical reaction that combines a substance with oxygen to produce an oxide.

Answer 14

oxidation

Question 15

A reducing agent __________.

Answer 15

adds hydrogen to a chemical compound

Question 16

The tail of a surfactant molecule is __________, or oil loving.

Answer 16

lipophilic

Question 17

The pH scale is _________.

Answer 17

lotharithmic

Question 18

A __________ is a stable, uniform mixture of two of more mixable substances that is made by dissolving a solid, liquid, or gaseous substance in another substance.

Answer 18

solution

Question 19

Which of the following allows oil and water to mix or emulsify by reducing surface tension?

Answer 19

surfactant

Question 20

__________ are examples of emulsions used in beauty services

Answer 20

facial creams

Question 21

Oxidation and reduction always occur simultaneously and are referred to as a(n) __________ reaction.

Answer 21

redox

Question 22

Rusting iron and burning wood are examples of a change in what type of properties?

Answer 22

chemical

Question 23

What does a pH below 7 indicate?

Answer 23

an acidic solution

Question 24

__________ refers to either the loss of oxygen or the addition of hydrogen.

Answer 24

reduction

Question 25

Which of the following is defined as anything that occupies space (volume) and has mass (weight)?

Answer 25

matter

Question 26

An example of a physical change is __________.

Answer 26

ice melting to water

Question 27

An example of a water-in-oil emulsion is __________.

Answer 27

cold cream

Question 28

An example of an elemental molecule is ___________.

Answer 28

atmospheric oxygen

Question 29

When oxygen is chemically combined with a substance, the substance is __________.

Answer 29

oxidized

Question 30

The are 118 different elements known to science today. How many of these are naturally occurring on Earth?

Answer 30

98

Question 31

As part of the Safety Data Sheet (SDS) categories, first-aid measures include important symptoms/effects, as well as ___________.

Answer 31

first aid instructions

Question 32

The pH scale measures the concentration of hydrogen ions in acidic and alkaline __________ solutions.

Answer 32

water - based

Question 33

The Safety Data Sheet (SDS) contains _________ categories of information.

Answer 33

16

Question 34

H is the symbol for which element

Answer 34

hydrogen

Question 35

Alkalis tend to __________ the hair.

Answer 35

swell

Question 36

What is the average pH for hair and skin?

Answer 36

5

Question 37

Which of the following are the basic building blocks of all matter

Answer 37

atoms

Question 38

What type of chemical reaction requires the absorption of energy or heat from an external source for the reaction to actually occur?

Answer 38

endothermic