Exam 3

Question 1

NO 3

Answer 1

1-

Question 2

SO 4

Answer 2

2-

Question 3

SO 3

Answer 3

2-

Question 4

MnO 4

Answer 4

1-

Question 5

Cr2O7

Answer 5

2-

Question 6

CO 3

Answer 6

2-

Question 7

C2O4

Answer 7

2-

Question 8

PO 4

Answer 8

3-

Question 9

NH4

Answer 9

1+

Question 10

What are the Soluble elements with no exceptions

Answer 10

Group 1

NH 4 +

Question 11

What are the soluble elements with exceptions

Answer 11

Halogens Cl, Br, I
-exception= Ag, Hg, Pb

SO 4
-exception= Ag, Pb
and Ca, Sr, Ba (group 2 elements)

Question 12

Insoluble with exceptions

Answer 12

OH- , S2
- except: Group 1, NH4, Ca, Sr, Ba (group 2)
CO3, PO4
- except: group 1/NH4

Question 13

what is solvent vs solute

Answer 13

solvent= what is doing the dissolving 
solute= whats getting dissolved

Question 14

If you dissolve 25.5 g of KBr in enough water to make 1.75 L of solution what is the molarity of the solution?
Molarity= Moles over litters (front page)

Answer 14

.122= M

Question 15

How many litters of a .125 M NaOH solution contain .255 moles of NaOH?

Answer 15

2.04 L of solution

Question 16

The procedure for sphereification calls for 3.00 L of a .500M CaCl2 solution. How can we prepare this solution from a 10.0 M stock solution?

Answer 16

M1+V1=M2+V2 (given first page)
Step 1: change to
V1= (M2*V2)/M1

Step 2: Sub in
M2= .500 M
V2= 3.00 L
M1= 10.0 M

.500 (mol/L) * 3.00 L
divided by
10.0 (mol/L)

Mol/L cancel out = .150L

Question 17

If there is an increase in oxidation number, what does that mean?

If there is a decrease in oxidation number?

Which one would be the reducing agent
which would be the oxidizing agent

Answer 17

1. oxidation
2. reduction
3. the one being oxidized is the reducing agent
4. the one being reduced is the oxidizing agent

Question 18

what is the equations that you need to know for bomb cali thing

Answer 18

qcal= Ccal time delta T

q rxn = -qcal

Delta E rxn = qrxn divided by number of moles

Question 19

what is the symbol for heat capactiy

Answer 19

Ccal

Question 20

what is the symbol for Cs

Answer 20

specific heat

Question 21

____________ is a substance that dissolves in water to form solutions that conduct electricity

Answer 21

electrolytes

Question 22

______________ is a substance that completely dissociates into ions when they dissolve in water
give an example

Answer 22

Sodium chloride

NaCl

Question 23

___________ are compounds such as ________ that do not dissociate into ions when dissolved in water ahd do not conduct electricity

Answer 23

nonelectrolytes

sugar

Question 24

_______ are molecular compounds that ionize to form H+ ions when they dissolve in water
give an example

Answer 24

Acids

Hydrochloric acid dissolves into H+ and Cl- when dissolved in water

Question 25

What is a strong acid

Answer 25

one that completely ionizes in solution example HCL strong acid = strong solution

Question 26

What is a weak acid give example weak acid also means _____________

Answer 26

does not completely ionize in water in solution ``` acetic acid (organic compounds) weak acid = weak electrolyte ```

Question 27

__________ conducts electricity but weakly

Answer 27

weak electrolyte

Question 28

What is a percipatate

Answer 28

a solid

Question 29

_____________ is a reaction in which a solid forms upon the mixing of two solutions

Answer 29

precipitation reaction

Question 30

In this equation what is the precipitate | 2KI + Pb(NO3)2 -> PbI2 + 2KNO3

Answer 30

PbI2 If it gives you whether it is aqueous or solid in products that will tell which is precipitate Also if reactants aren't two aqueous solutions their wont be a precipitate

Question 31

Write an equation for the precipitation reaction that occurs (if any) when you mix solutions of potassium carbonate and nickle chloride K2CO3 and NiCl2 Then write net ionic equation

Answer 31

K2CO3 (aq) + NiCl2 (aq) -> KCl + NiCO3 (products at this stage are only possible products) -If all are soluble write no reaction at this point if not keep goin Step 3: if any products = insoluble, write formulas as the products of the reatction -> NiCO3 + 2KCl Step 4: Balance equation K2CO3 + NiCl2 ->NiCO3 + 2KCl

Question 32

___________ is an equation that shows complete neutral formulas for each compound in reaction __________ is an equation that lists all ions present as either reaction/products in a chem reaction ____________ is equations that show only species that actually change during reaction

Answer 32

molecular equation complete ionic equation net ionic equation

Question 33

Write the net ionic equation for Pb(NO3)2 + 2KCl -> PbCl2 + 2KNO3

Answer 33

Complete ionic = First checked which one is insoluble (Pb 2+) + (2* NO3 1-) + (2K +) +(2Cl -) -> PbCl2 + (2K +) + (NO3 -) Then eliminate spectator (Pb 2+) + (2 Cl-) -> PbCl2

Question 34

Pb charge

Answer 34

2+

Question 35

Ag charge

Answer 35

2+

Question 36

Hg charge

Answer 36

2+

Question 37

Au

Answer 37

2+

Question 38

Sn

Answer 38

2+

Question 39

H

Answer 39

+

Question 40

______________ is the substance that causes reduction of another substance (the one being oxidized) _______________- is the substance that causes oxidation of another substance (the one being reduced)

Answer 40

reducing agent oxidizing agent

Question 41

______________ is the capacity to do work

Answer 41

energy

Question 42

_____________ is result of a force acting through a distance | examples

Answer 42

work | - pushing box across floor

Question 43

_________________ energy is energy associated with motion of object _____________ energy is associated with temp of object and is a type of Kinetic energy ____________ energy associated with position or composition of an object ____________ energy associated with relative positions of electrons and nuclei in atoms and molecules

Answer 43

kinetic thermal potential chemical

Question 44

What is this | the total energy of the univerise is constant

Answer 44

First law of thermodynamics

Question 45

When a change in system is -115J what does that mean in terms of system and surrondings

Answer 45

system loses 115J | Surroundings gain 115 J

Question 46

C2H3O2

Answer 46

1-

Question 47

What is the eg and mg of BeF2 SO4- NH3 H2O OH- BF3

Answer 47

1. Linear 2.