DAT Destroyer Gen Chem

Question 1

what is molar mass

Answer 1

the Grams/Moles of a substance

Question 2

what does an increase in number of dissolved particles do to freezing and boiling points

Answer 2

more particles = lower freezing point

and higher boiling point

Question 3

what is something to consider when evaluating solubility

Answer 3

the common ion effect

Question 4

What are diamagnetic elements

Answer 4

ones that all of the electron spins are paired

Question 5

what happens in the electrolysis of water

Answer 5

Electricity is passed through water
O2 and H2 are produced ( 2H moles per O mole)
O2 at the anode, H2 at the cathode

Question 6

What are the physical states of Cl2, W, K, Pb, Hg, Br2, and Sb at 25 degrees celcius

Answer 6

Cl2 is a gas
HG and Br2 are liquids
W, K, Pb, Sb are solids

Question 7

what is molecular mass

Answer 7

how much one mole weighs (g/mol)

Question 8

when is the standard enthalpy of formation = 0 (with 1 atm and at 25 degrees celcius)

Answer 8

when you are working with pure elements of diatomic molecules in their most stable form

Question 9

What is the most stable forms of 
Cl2
I2
H2
Br2
H2O at standard temp and pressure

Answer 9

Cl2 and H2 are gases
I2 is a solid
Br2 and H2O are liquids

Question 10

what is the melting point of ionic compounds

Answer 10

they are usually high melting point solids

Question 11

Which is stronger network or molecular solids

Answer 11

network (diamonds)

Question 12

Can you get the rate law from a balanced equation?

Answer 12

nope, it must be figured out experimentally

Question 13

What does Ksp mean for solubility

Answer 13

the higher the Ksp, the higher the solubility

Question 14

What kinds of things are very soluble in NH3 and why

Answer 14

compounds with transition metals, because they form complexes with the NH3

Question 15

How much of the human body is made up of oxygen

Answer 15

65%

Question 16

is the Si-O bond weak or strong

Answer 16

very strong

Question 17

how does metallic character change across the periodic table

Answer 17

it is the highest in the bottom left

Question 18

which usually has higher melting points metals or non metals

Answer 18

metals

Question 19

how do you know which molecules in a gas move the fastest

Answer 19

the lightest ones move the fastest

Question 20

When at STP how do you know which gas in the most dense

Answer 20

the one with the highest mass

Question 21

what defines a redox reaction

Answer 21

a change in oxidation number

Question 22

what are three types of elemental carbon

Answer 22

diamonds
graphite
buckminsterfullerene

Question 23

what is group one called, two called

Answer 23

alkali

alkaline earth metals

Question 24

what is the henderson hasselbach equation for buffers

Answer 24

pH = pKa + log (salt/acid)

Question 25

should you add water to acid or acid to water

Answer 25

acid to water, because it is a violently exothermic reaction and can splash out if you add water to acid

Question 26

What ions can As produce

Answer 26

+3
-3
+5

Question 27

how do you balance redox reactions

Answer 27

1. separate the two equations
2. balance O’s with H2O
3. balance H’s with H+
4. balance charges with e-‘s
5. combine reactions to cancel out e-‘s

Question 28

do ionic compounds form individual molecules

Answer 28

nope, they just form crystals

Question 29

aside from electronegativity what can make substances polar

Answer 29

if they have uneven electron pairs

Question 30

do all molecules in an ideal gas have the same kinetic energy at constant temperature

Answer 30

nope

Question 31

what are dessicators used for

Answer 31

to prevent the uptake of moisture

Question 32

what are some insolubility clues

Answer 32

Ag, Hg, Pb are all likely unsoluble

BaSO4 and CaCO3, CaOH are unsoluble