Lecture 1

Question 0

Matter

Answer 0

Has mass and take up space

Question 1

Chemistry

Answer 1

Study of matter and how it changes

Question 2

Atom

Answer 2

Smallest building blocks

Question 3

Molecules

Answer 3

2 or more atoms jointed together

Question 4

Solid

Answer 4

Fixed shape
Doesn’t conform to a container nor fills it
Atoms/molecules: rigid and organized

Question 5

Liquid

Answer 5

No specific shape
Does conform to a container, somewhat fills it
Close together and disorganized

Question 6

Gas

Answer 6

No shape
Does conform to a container, somewhat fills
Far apart and disorganized

Question 7

Pure substances

Answer 7

Have distinct properties and a fixed composition

Question 8

Elements

Answer 8

Can’t decompose
Listed on periodic table (118 are known)
Represented by 1 or 2 letters

Question 9

Diatomic molecules

Answer 9

2 of the same atom

7 exist, all are gases

Question 10

Natural state

Answer 10

How exist in nature

Question 11

Compounds

Answer 11

Molecules of 2 or more different elements
Combined in a fixed ratio
Able to decompose into elements

Question 12

Mixture

Answer 12

Combo of 2 or more substances
No fixed composition
Each substance keeps their original properties
Can separate each substance

Question 13

Homogeneous mixture

Answer 13

Uniform appearance and composition

Ex: air sugar water

Question 14

Heterogeneous mixture

Answer 14

Not uniform composition and appearance

Ex: sand, rocks

Question 15

Exact #’s

Answer 15

Values are known exactly determined by:
Counting -5 pens
Definition - dozen = 12 pens

Question 16

Inexact #’s

Answer 16

Contains uncertainty
Result of equipment or human error in a measurement
-a guess is usually involved

Question 17

Significant figures

Answer 17

Determines what numbers are important

Question 18

General rule

Answer 18

Work left to right, once hit a number (1-9) start counting all digits
9604 -> 4 sigs