Exam 1

Question 0

Definition of Celsius

Answer 0

Freezing point=0 C

Boiling point=100 C

Question 1

Definition of Fahrenheit

Answer 1

Freezing point=32 F

Boiling point=212 F

Question 2

F to C equation

Answer 2

C=5/9(F-32)

Question 3

To F equation

Answer 3

F=9/5C+32

Question 4

C to K equation

Answer 4

K=C+273.15

Question 5

Physical property

Answer 5

Can be observed without a chemical change. Ex) melting/freezing/boiling point

Question 6

Chemical property

Answer 6

Can only be observed when a chemical change or reaction happens. Ex) flashing/flammability

Question 7

Extensive property

Answer 7

Dependent of the amount of the sample. Ex) mass volume

Question 8

Intensive property

Answer 8

Independent of the amount of the sample. Ex) temperature, density, pressure, melting/freezing/boiling point

Question 9

SI unit for mass

Answer 9

Kilogram-kg

Question 10

SI unit for length

Answer 10

Meter-m

Question 11

SI unit for time

Answer 11

Seconds-s

Question 12

SI unit for temperature

Answer 12

Kelvin-k

Question 13

SI unit for volume

Answer 13

M^3

Question 14

Giga

Answer 14

G 10^9

Question 15

Mega

Answer 15

M 10^6

Question 16

Kilo

Answer 16

k 10^3

Question 17

Deci

Answer 17

d 10^-1

Question 18

Centi

Answer 18

c 10^-2

Question 19

Milli

Answer 19

m 10^-3

Question 20

Nano

Answer 20

n 10^-9

Question 21

Pico

Answer 21

p 10^-12

Question 22

Femto

Answer 22

f 10^-15

Question 23

Micro

Answer 23

U 10^-6

Question 24

Physical change

Answer 24

Don’t have a change of the substance. Ex) state changes: solid/liquid/gas, change during a physical separation.

Question 25

Chemical change

Answer 25

The substance before and after the change are different. Ex) corrosion of metal, burning of the nature gas

Question 26

Atom

Answer 26

Extremely small particle, generally doesn’t change in a chemical reaction

Question 27

Molecule

Answer 27

Formed when 2 or more atoms are joined together by chemical bond. The atoms that form a molecule can be same

Question 28

Element

Answer 28

Contains only one type of atom

Question 29

Compound

Answer 29

Molecule is formed when 2 or more different types of atoms are joined together by chemical bond

Question 30

Organic compounds

Answer 30

Contain carbon

Question 31

Inorganic compounds

Answer 31

Don’t contain carbon

Question 32

Pure substance

Answer 32

Contains only 1 type of molecule (element or compound). A pure substance is usually referred to as a substance. Elements and compounds are pure substances

Question 33

Homogeneous

Answer 33

When a matter is uniform throughout in terms of chemical composition, properties and appearance. Ex) water, air, water/salt mix

Question 34

Heterogeneous

Answer 34

When a matter is not uniform throughout in terms of chemical composition, properties and appearance. Ex) sand/water mix

Question 35

Mixture

Answer 35

Consists of 2 or more pure substances. Homogeneous mixtures are called solutions. All gaseous mixtures are homogeneous.

Question 36

Dalton’s postulates

Answer 36

Each element is composed of extremely small particles called atoms.
All atoms of a given element are identical. Atoms of diff elements are diff and have diff properties
Atoms are neither created nor destroyed in chemical reactions. Atoms of an element are not changed into atoms of a diff element by chemical reactions
Compounds are formed when atoms of diff elements combine. A given compound always has the same relative number and kind of atoms