Half test 1

Question 1

What is the definition of chemistry?

Answer 1

Chemistry is the study of the composition, properties, and structure of matter, the process the matter undergoes, and the energy changes that accompany these processes.

Question 2

Control

Answer 2

An element that remains unchanged or unaffected by other variables

Question 3

Independent Variable

Answer 3

The variable that the experimenter actively changes or manipulates during an experiment

Question 4

Dependent Variable

Answer 4

The variable being tested in a scientific experiment

Question 5

Change of State

Answer 5

The physical change of a substance from one state to another

Question 6

Intensive property

Answer 6

Does not depend on the amount present

Question 7

Extensive Property

Answer 7

Depends on the amount present

Question 8

Intensive property examples

Answer 8

Color, Hardness, and Texture

Question 9

Extensive Property Examples

Answer 9

Shape, Mass, and Width

Question 10

Reactants

Answer 10

Substances that react

Question 11

Products

Answer 11

Substances that are formed

Question 12

the law of conservation of mass

Answer 12

In a chemical reaction matter is neither created nor destroyed

Question 13

Matter

Answer 13

Anything that has mass and takes up space

Question 14

Pure Substances

Answer 14

Composition does not vary from sample to sample, same throughout

Question 15

Mixture

Answer 15

Contains more than one substance, and can vary in composition and properties, not only from sample to sample, but from one part of the sample to the other

Question 16

Homogeneous

Answer 16

Uniform Mixtures

Question 17

Heterogeneous

Answer 17

Mixtures that are not uniform

Question 18

Vertical columns of the periodic table are_____

Answer 18

Groups

Question 19

Horizontal rows of the periodic table are_____

Answer 19

Periods

Question 20

The two rows below the periodic table are called __________ and ________ ______

Answer 20

Lanthanide and Actinide Series

Question 21

Most Metals are____

Answer 21

Malleable

Question 22

Metals

Answer 22

Elements that are good conductors of heat and electricity

Question 23

Metals tend to be____

Answer 23

Ductile

Question 24

Most metals have a _______ or ________ _____ luster

Answer 24

Silver/grayish white

Question 25

Metals that don’t have a silvery luster are ____ and ______

Answer 25

Gold and Copper

Question 26

Non Metals

Answer 26

Elements that are poor conductors of heat and electricity

Question 27

Many non metals are ______ at room temperature

Answer 27

Gases

Question 28

Metaloids

Answer 28

Have characteristics of both metals and non-metals, making the stair-like structure of elements in between the two.

Question 29

Examples of metaloids are____

Answer 29

Boron, silicon, germanium, arsenic, antimony, and tellurium

Question 30

Metalloids tend to be less ________ than metals and not as _______ as non metals

Answer 30

Malleable and brittle

Question 31

Atom

Answer 31

Smallest unit of an element that maintains the chemical identity of that element

Question 32

Solid Non Metals tend to be _______

Answer 32

brittle

Question 33

Compound

Answer 33

A substance that can be broken down into simpler stable substances

Question 34

Physical Properties

Answer 34

Can be observed or measured WITHOUT changing the identity of the substance

Question 35

Chemical Properties

Answer 35

A substance’s ability to undergo changes that transform it into something different

Question 36

Solids

Answer 36

Definite volume, definite shape

Question 37

Liquids

Answer 37

Definite volume, indefinite shape

Question 38

Gases

Answer 38

Indefinite volume, indefinite shape