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Chemistry > Exam 3 > Flashcards

Exam 3 Flashcards

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1
Q

NO 3

A

1-

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2
Q

SO 4

A

2-

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3
Q

SO 3

A

2-

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4
Q

MnO 4

A

1-

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5
Q

Cr2O7

A

2-

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6
Q

CO 3

A

2-

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7
Q

C2O4

A

2-

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8
Q

PO 4

A

3-

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9
Q

NH4

A

1+

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10
Q

What are the Soluble elements with no exceptions

A

Group 1

NH 4 +

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11
Q

What are the soluble elements with exceptions

A

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

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

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12
Q

Insoluble with exceptions

A

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

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13
Q

what is solvent vs solute

A 
solvent= what is doing the dissolving 
solute= whats getting dissolved
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14
Q

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)

A

.122= M

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15
Q

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

A

2.04 L of solution

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16
Q

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?

A

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

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17
Q

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

A
  1. oxidation
  2. reduction
  3. the one being oxidized is the reducing agent
  4. the one being reduced is the oxidizing agent
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18
Q

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

A

qcal= Ccal time delta T

q rxn = -qcal

Delta E rxn = qrxn divided by number of moles

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19
Q

what is the symbol for heat capactiy

A

Ccal

20
Q

what is the symbol for Cs

A

specific heat

21
Q

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

A

electrolytes

22
Q

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

A

Sodium chloride

NaCl

23
Q

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

A

nonelectrolytes

sugar

24
Q

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

A

Acids

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

25
Q

What is a strong acid

A

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

26
Q

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

A

does not completely ionize in water in solution

acetic acid (organic compounds)
weak acid = weak electrolyte
27
Q

__________ conducts electricity but weakly

A

weak electrolyte

28
Q

What is a percipatate

A

a solid

29
Q

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

A

precipitation reaction

30
Q

In this equation what is the precipitate

2KI + Pb(NO3)2 -> PbI2 + 2KNO3

A

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

31
Q

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

A

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

32
Q

___________ 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

A

molecular equation

complete ionic equation

net ionic equation

33
Q

Write the net ionic equation for

Pb(NO3)2 + 2KCl -> PbCl2 + 2KNO3

A

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

34
Q

Pb charge

A

2+

35
Q

Ag charge

A

2+

36
Q

Hg charge

A

2+

37
Q

Au

A

2+

38
Q

Sn

A

2+

39
Q

H

A

+

40
Q

______________ 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)

A

reducing agent

oxidizing agent

41
Q

______________ is the capacity to do work

A

energy

42
Q

_____________ is result of a force acting through a distance

examples

A

work

- pushing box across floor

43
Q

_________________ 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

A

kinetic
thermal
potential
chemical

44
Q

What is this

the total energy of the univerise is constant

A

First law of thermodynamics

45
Q

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

A

system loses 115J

Surroundings gain 115 J

46
Q

C2H3O2

A

1-

47
Q

What is the eg and mg of BeF2

SO4-

NH3

H2O

OH-

BF3

A
  1. Linear

2.

Chemistry (7 decks)

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