Midterm

Question 0

Conversion factors:
____ cm = ____ m
____ g= _____ kg
____ mL=____L

Answer 0

100 cm = 1 m
1000 g= 1 Kg
1000 mL= 1 L

Question 1

Difference between accuracy and precision?

Answer 1

Accuracy-How close to actual value

Precision- how close together values are

Question 2

Law Of Conservation of Matter

Answer 2

In a chemical reaction mass is not gained or destroyed

Question 3

Law of definite proportions

Answer 3

Atoms of the same element can combine in more than one ratio to another element to form different compounds

Question 4

Law of definite composition

Answer 4

A chemical compound always contains the same element in the same proportion regardless of where it comes from

Question 5

John DALTON

Answer 5

Developed 1st atomic theory. 4 postulates

Question 6

JJ Thompson

Answer 6

Discovered electrons

Plum Pudding Model

Question 7

Ernest Rutherford

Answer 7

Gold Foil Experiment

Concluded Atom had price nucleus and is surrounded by electrons

Question 8

Bohr

Answer 8

Planetary Model

Question 9

Schrodinger

Answer 9

Modern model

Question 10

Atom

Answer 10

Smallest particle of an element that retains its properties

Question 11

Atomic #

Answer 11

Equal to number of protons

Question 12

Mass number

Answer 12

Protons + Neutrons

Question 13

Isotope

Answer 13

Atoms that have the same number of protons but different number of neutrons

Question 14

Average Atomic Mass

Answer 14

weighted average of the masses of all the isotopes of an element

Question 15

Proton

Answer 15

+1 charge
Nucleus
Relative mass of 1

Question 16

Electron

Answer 16

-1
Outside of Nucleus
Relative mass of 1

Question 17

Neutron

Answer 17

Neutral charge
Nucleus
1/2000 (less than one)

Question 18

Element

Answer 18

Made of one kind of atom can’t be broken down further

Question 19

Example of element

Answer 19

Silver, Sulfur, Oxygen

Question 20

Compound

Answer 20

2+ elements CHEMICALLY combined

Question 21

Example of Compound

Answer 21

H20, CO2, NaCl

Question 22

Mixture

Answer 22

2+ elements PHYSICALLY combined

Question 23

Example of Mixture

Answer 23

Trail Mix

Question 24

Heterogeneous Mixture

Answer 24

Different properties throughout, unevenly distributed EX Trail Mix

Question 25

Homogeneous Mixture

Answer 25

Similar properties throughout, evenly distributed. Called solution. EX: Kool Aid

Question 26

Covalent bonds made of?

Answer 26

Nonmetal + Nonmetal

Question 27

Ionic made of?

Answer 27

Metal + Nonmetal

Question 28

Location of Metals

Answer 28

Left Side

Question 29

Location of Nonmetal

Answer 29

Right side

Question 30

Location of Metalloids

Answer 30

Staircase

Question 31

Metal properties

Answer 31

``` Form Cations Malleable Conduct heat/electricity Ductile luster Mostly solids ```

Question 32

Nonmetal properties

Answer 32

Form Anions Poor Conductors Brittle Mostly gases

Question 33

Metalloids Properties

Answer 33

Form Anion and Cation Share characteristics Dull appearance Semiconductors

Question 34

Ionization definition

Answer 34

Energy required to move one electron from an atom. Higher IE=More difficult

Question 35

Ionization Energy across period

Answer 35

Increases

Question 36

Ionization Energy trend down a group

Answer 36

Decreases

Question 37

Atomic Radius Def.

Answer 37

Distance from center of atom go the edge.

Question 38

AR trend across period

Answer 38

Decrease

Question 39

AR trend down group

Answer 39

Increase

Question 40

Electronegativity

Answer 40

Ability of an atom to attract electrons when the atom is part of a compound

Question 41

Most electronegative element

Answer 41

F2

Question 42

Electro. trend across period

Answer 42

Increases

Question 43

EN trend down group

Answer 43

Decreases

Question 44

Alkali Properties

Answer 44

Silver, soft, very reactive, not found in nature, form +1 ions

Question 45

Halogen Properties

Answer 45

Most reactive NONMETALS, dif states of matter, form -1 ion

Question 46

Noble Gases Properties

Answer 46

Unreactive, all gases, form no ions

Question 47

Four signs of Chemical Change

Answer 47

Release of Gas Color Change Release of Energy (Heat/Light) Formation of precipitate

Question 48

Prefixes

Answer 48

``` 1-Mono 2-Di 3-Tri 4-Tetra 5-Penta 6-Hexa ```

Question 49

I mole equals....

Answer 49

6. 02 x 10^23 | 22. 4 Liters