Chapter F6: Chemistry & Chemical Safety

Question 1

The science that deals with the composition, structures, and properties of matter and how matter changes under different conditions.

Answer 1

Chemistry

Question 2

Any substance that occupies space and has mass (weight)

Answer 2

Matter

Question 3

The simplest form of chemical matter and contains only one type of atom.

Answer 3

Element

Question 4

How many elements are know to science today?

Answer 4

118

98 occur naturally on earth, the other 20 are synthetic elements.

Question 5

The basic unit of matter

Answer 5

Atoms

Question 6

Subatomic particles with a negative charge.

Answer 6

Electrons

Question 7

Subatomic particles with a positive charge.

Answer 7

Protons

Question 8

Subatomic particles with no charge.

Answer 8

Neutrons

Question 9

Molecules are made by combining _________

Answer 9

Atoms

Question 10

A chemical combination of two or more atoms in definite (fixed) proportions.

Answer 10

Molecule

Question 11

A molecule containing two or more of the same element in definite (fixed) proportions.

Answer 11

Elemental molecule

Question 12

Chemical combinations of two or more atoms of different elements in definite (fixed) proportions.

Answer 12

Compound molecules (compounds)

Question 14

A change in the form or physical properties of a substance, without a chemical reaction or the creation of a new substance.

Answer 14

Physical change

Question 15

A change in the chemical composition or makeup of a substance.

Answer 15

Chemical change

Question 16

Characteristics that can be determined without a chemical reaction and do not involve a chemical change in the substance.

Answer 16

Physical change

Question 17

Characteristics that can be determined only by a chemical reaction and involved a chemical change in the substance.

Answer 17

Chemical properties.

Question 18

Not flamable

Answer 18

Nonflammable

Question 19

A chemical combination of matter in defiantly (fixed) proportions with unique properties.

Answer 19

Pure substance

Question 20

A physical combination of matter in any proportion.

Answer 20

Physical mixture

Question 21

A stable, uniform mixture of two or more substances.

Answer 21

Solution

Question 22

The substance that is dissolved in a solution.

Answer 22

Solute

Question 23

The substance that dissolves the solute and makes the solution.

Answer 23

Solvent

Question 24

Liquids are mutually soluble, meaning that they can be mixed together to form solutions. (Water and salt)

Answer 24

Miscible

Question 25

Liquids that are not capable of being mixed together to form stable solutions. (Oil and water)

Answer 25

Immiscible

Question 26

Unstable physical mixtures of undissolved particles in liquid. (Glitter in nail polish)

Answer 26

Suspensions

Question 27

An unstable physical mixture of two or more immiscible substances (substances that normally will don’t stay mixed) plus a special ingredient called an emulsifier.

Answer 27

Emulsion

Question 28

An ingredient that brings two normally incomparable materials together and binds them into a uniform and fairly stable mixture.

Answer 28

Emulsifier

Question 29

Substances that allow oil and water to mix, or emulsify.

Answer 29

Surfactants

Question 30

Comedones

Answer 30

Blackheads