Introduction to Chemistry

Question 1

Define “chemistry”

Answer 1

The study of matter and the changes it undergoes; describes observed properties and changes using particles involved

Question 2

Define “model”

Answer 2

A visual, verbal, or mathematical explanation for data

Question 3

Define “quantitative”

Answer 3

Data obtained using a measuring device; always consists of a value (number) with the correct number of significant figures and a unit

Question 4

Define “mass”

Answer 4

A measurement (usually in grams) of the amount of matter

Question 5

Define “qualitative”

Answer 5

Anything that relates to the senses; physical characteristics

Question 6

Define “volume”

Answer 6

A measurement (often in mL) of the amount of space matter takes up

Question 7

Define “density”

Answer 7

The amount of mass in a given volume; can be visualized using the particle model

Question 8

Beaker

Answer 8

For holding and heating liquids, NOT for measuring liquid volumes

Question 9

Erlenmeyer flask

Answer 9

For holding and heating liquids. NOT for measuring liquid volumes

Question 10

Volumetric flask

Answer 10

For preparing precise volumes of solutions

Question 11

Graduated cylinder

Answer 11

For measuring liquid volumes

Question 12

Evaporating dish

Answer 12

For evaporating liquids

Question 13

Crucible with lid

Answer 13

For heating solids over a bunsen burner

Question 14

Clay triangle

Answer 14

For holding a crucible on a ring stand

Question 15

Crucible tongs

Answer 15

For picking up and moving hot crucibles and lids

Question 16

Wire screen

Answer 16

For supporting beakers and evaporating dishes on a ring stand

Question 17

Ring stand

Answer 17

Used to support other pieces of lab equipment such as crucibles, wire screens, etc.

Question 18

Iron ring clamp

Answer 18

Attached to a ring stand; supports wire screens, clay triangles, and funnels

Question 19

Utility clamp

Answer 19

Attaches to a ring stand and holds a test tube

Question 20

Test tube

Answer 20

For holding and mixing small amounts of chemicals

Question 21

Test tube holder

Answer 21

For holding hot test tubes

Question 22

Test tube rack

Answer 22

For holding and organizing test tubes

Question 23

Scoopula

Answer 23

For taking solids out of containers

Question 24

Watch glass

Answer 24

For holding small amounts of chemicals; can also function as a lid for a beaker or evaporating dish

Question 25

Stirring rod

Answer 25

For stirring liquids

Question 26

Bunsen burner

Answer 26

For general purpose heating

Question 27

Hot plate

Answer 27

For heating beakers and Erlenmeyer flasks

Question 28

Balance

Answer 28

For massing objects in grams

Question 29

Weight boat

Answer 29

For measuring powders or small objects on a balance

Question 30

Beral (disposable) pipette

Answer 30

For transferring small amounts of liquids

Question 31

Mortar and pestle

Answer 31

For grinding solids into powder

Question 32

Funnel

Answer 32

For pouring liquids into containers and for holding filter paper

Question 33

Atom

Answer 33

The smallest unit of matter; can't be broken down further

Question 34

Molecule

Answer 34

Two or more atoms chemically bonded together

Question 35

Pure substances

Answer 35

A substance that contains a single type of particle; all the same atom or all the same molecule

Question 36

Mixtures

Answer 36

A substance that contains more than one type of particle

Question 37

Elements

Answer 37

Contains a single type of atom; listed on the periodic table

Question 38

Compounds

Answer 38

Contains more than one element chemically bonded to form molecules

Question 39

Homogenous mixtures

Answer 39

A mixture with an even or uniform distribution of particles

Question 40

Heterogeneous mixtures

Answer 40

A mixture with an uneven distribution of particles

Question 41

Significant figures

Answer 41

The number of all known digits in a reported measurement plus one estimated value

Question 42

Accuracy

Answer 42

How close the data is to the desired goal or "true" value

Question 43

Precision

Answer 43

How consistent the data is

Question 44

(MEMORIZE FORMULAS; no answer)

Answer 44

N/A

Question 45

Physical property

Answer 45

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

Question 46

Chemical property

Answer 46

Describes how one substance chemically reacts with another