LESSON 1

Question 1

The field of study concerned with the characteristics, composition, and transformations

Answer 1

Chemistry

Question 2

Amount of matter in an object (constant)

Answer 2

Mass

Question 3

The gravitational force of attraction exerted by the earth on a body (varies from places)

Answer 3

Weight

Question 4

Physical states of matter

Answer 4

Solid, Liquid, & Gas

Question 5

Shape and Volume of Solid

Answer 5

Definite, definite

Question 6

Shape and Volume of Liquid

Answer 6

Indefinite, Definite

Question 7

Shape and Volume of Gas

Answer 7

Indefinite, Indefinite

Question 8

Solid to Gas

Answer 8

Sublimation

Question 9

Gas to Solid

Answer 9

Deposition

Question 10

Liquid to Gas

Answer 10

Vaporization/Evaporation

Question 11

Gas to Liquid

Answer 11

Condensation

Question 12

Solid to Liquid

Answer 12

Melting

Question 13

Liquid to Solid

Answer 13

Freezing

Question 14

Distinguishing characteristic of a substance, used for identification & description

Answer 14

Property

Question 15

Characteristic of a substance that can be observed without changing the basic identity of a substance

Answer 15

Physical property

Question 16

Common physical properties

Answer 16

Color, physical state (SLG), melting & boiling point, hardness

Question 17

Characteristic of a substance that describes the way the substance undergoes or resists change to form a new substance

Answer 17

Chemical property

Question 18

Interaction (reaction) of a substance with one or more substances

Answer 18

Chemical property

Question 19

A change that occurs when there is a presence of energy (heat or light)

Answer 19

Decomposition (H2O2 > H2O and O2)

Question 20

A substance changes its physical appearance but not its chemical composition

Answer 20

Physical change

Question 21

A substance undergoes a change in chemical composition

Answer 21

Chemical change

Question 22

Always involved conversion of the material/s into one or more new substances

Answer 22

Chemical change

Question 23

Chemical change

Answer 23

Chemical reaction

Question 24

Chemical identity DOES NOT CHANGE

Answer 24

PHYSICAL

Question 25

Chemical identity DOES CHANGE

Answer 25

Chemical

Question 26

A single kind of matter that *cannot be separated* into other kinds of matter by any physical means

Answer 26

Pure substance

Question 27

A Pure substance has

Answer 27

Definite & constant composition

Question 28

A *physical combination of two or more pure substances* in which each substance retains its own chemical identity

Answer 28

Mixture

Question 29

Physically mixed, not chemically combined

Answer 29

Mixture

Question 30

Can be separated by using physical means

Answer 30

Mixture

Question 31

Another characteristic of a mixture

Answer 31

Variable composition

Question 32

A *pure substance* that cannot be *broken down* into simpler pure substances by chemical means

Answer 32

Element

Question 33

A *pure substance* that *can be broken down into two/more simpler substances by chemical means*

Answer 33

Compound

Question 34

Breakdown products for any compound

Answer 34

Elements

Question 35

A mixture that contains *visibly different phases*, non uniform appearance

Answer 35

Heterogenous mixture

Question 36

A mixture that contains *only one visible distinct phase*, uniform properties

Answer 36

Homogenous mixture

Question 37

States that “Different samples of the same compound always contain its constituents elements in the same proportion by mass”

Answer 37

Law of definite proportion

Question 38

By Joseph Proust

Answer 38

Law of definite proportion

Question 39

States that “if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the element are in ratios of small whole numbers”

Answer 39

Law of multiple proportion

Question 40

States that “matter can be neither created nor destroyed”

Answer 40

Law of conservation of mass

Question 41

Process of getting the actual measure of an object’s dimension in terms of standard unit

Answer 41

Measurements

Question 42

How close a measurement is to the true value

Answer 42

Accuracy

Question 43

Refers to the repeatability of the measurement

Answer 43

Precision