Chem exam

Question 1

What is the formula for RAM?

Answer 1

isotopes mass x isotopes abundance

Question 2

Who told the elements where to go?

Answer 2

Mendeleev

Question 3

Why was the periodic table revised?

Answer 3

Atomic mass was not in order

Question 4

What is the trend in atomic size?

Answer 4

Decreases across, increases down

Question 5

What is the trend in ionization energy?

Answer 5

increases across, decreases down

Question 6

What is the trend in electron affinity?

Answer 6

increases across, decreases down

Question 7

What is Na2O

Answer 7

Sodium oxide

Question 8

what is ZnI2

Answer 8

Zinc iodide

Question 9

Silver oxide

Answer 9

Ag2O

Question 10

Phosphorus(III) oxide

Answer 10

P2O3

Question 11

P2O5

Answer 11

Phosphorus (V) oxide

Question 12

Antimony(V) oxide

Answer 12

Sb2O5

Question 13

CuS

Answer 13

Copper (II) sulfide

Question 14

Al(NO3)3

Answer 14

Aluminum Nitrate

Question 15

What are the acid prefix and suffixs in order? (4)

Answer 15

per_ic acid
_ic acid
_ous acid
Hypo_ous acid

Question 16

What are the ion prefixes and suffixes?

Answer 16

Per_ate
_ate
_ite
Hypo_ite

Question 17

Potassium Perbromate

Answer 17

KBrO4

Question 18

Al(NO)3

Answer 18

Aluminum hyponitrite

Question 19

What is an ion?

Answer 19

A atom that lost or gained electrons to form a stable octet

Question 20

What are the 4 molecular shapes?

Answer 20

Linear, bent, Triagonal pyramid, Tetrahedral

Question 21

How do you calculate bond polarity?

Answer 21

The difference in Electronegativity- More than 0.4 is polar

Question 22

What are the three units of percentage concentration?

Answer 22

%m/V, %m/m, %v/v

Question 23

How is %m/v calculated?

Answer 23

Mass of sulte(g)/Volume of solution(mL) x 100

Question 24

What is the combined gas law?

Answer 24

P1V1/T1 = P2V2/T2

Question 25

What did Dalton do?

Answer 25

Billard ball- law of conservation of mass

Question 26

What did Thomson do?

Answer 26

Cathode ray tube, plum pudding model

Question 27

What did Rutherford do?

Answer 27

Gold foil expierment, discovered nucleaus

Question 28

What did Bohr do?

Answer 28

Energy levels, energy lost in the form of light

Question 29

What is an isotope?

Answer 29

Sam number of protons, different neutrons

Question 30

RAM example

Answer 30

RAM= Isotopes Br-58= 97.203% - 0.97203 Br-62= 1.005% - 0.01005 RAM = mass of each isotope RAM= mas of Br-58, Br-62 =(0.97203 x 58.056u) +(0.01005 x 61.897u)

Question 31

What electrons are shown in a lewis diagram?

Answer 31

Valence electrons only

Question 32

What is a radioisotope?

Answer 32

Same protons different neutrons (unstable nucleaus)

Question 33

What force are cations and anions attracted by?

Answer 33

Electrostatic called ionic bond.

Question 34

How many elements do binary acids have?

Answer 34

2

Question 35

What do oxy-acids have in common?

Answer 35

Oxygen

Question 36

What do all acids start with?

Answer 36

Hydrogen

Question 37

What do molecular compounds share?

Answer 37

Electrons

Question 38

What is bonding capacity?

Answer 38

Valence electrons missing/ available pairs in a non-metal

Question 39

What is an ionic bond?

Answer 39

Metal + non metal

Question 40

What is a covalent bond?

Answer 40

Non metal + non metal

Question 41

What are the 2 INTRA molecular forces

Answer 41

Ionic, covalent (between atoms within a molecule)

Question 42

What are the 3 INTER molecular forces?

Answer 42

Hydrogen, London dispersion, dipole dipole

Question 43

What s the weakest intermolecular force?

Answer 43

London dispersion

Question 44

What is the strongest intermolecular force?

Answer 44

Hydrogen

Question 45

What are 5 types of chemical reactions?

Answer 45

Acid-base neutralization, single or double displacement, synthesis, decomposition

Question 46

What is an acid-base neutralization reaction?

Answer 46

Exchanging hydrogen ions

Question 47

What is a combustion reaction?

Answer 47

Using oxygen, releasing large quantities of energy CxHy + O2 = CO2 + H2O Producing carbon dioxide

Question 48

What is an incomplete combustion reaction?

Answer 48

Limited oxygen, produces CO

Question 49

What is A mole?

Answer 49

6.02x10^23

Question 50

What si the formula for percente yield?

Answer 50

%yeild= Actual/theoretical x 100

Question 51

What is 1 ppm?

Answer 51

Ippm = 1mg/1kg

Question 52

What is a base?

Answer 52

Oxides, hydroxides, carbonates of metals

Question 53

What is supersaturated?

Answer 53

More solute than can be dissolved