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Chemistry Lab final > Final > Flashcards

Final Flashcards

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0
Q

What does TLC stand for?

A

Thin Layer Chromatography

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1
Q

What is the mobile phase of TLC experiment?

A

The solvent

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2
Q

What are 4 reasons why TLC is used?

A

Analyze compounds
Determine purity of products
Identify a substance
Follow progress of a reaction

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3
Q

How does the compound rise up the TLC plate?

A

By capillary action

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4
Q

The compound that moves the greatest distance on the TLC plate is…

A

Least tightly absorbed to the stationary phase

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5
Q

What are the most common things that cost the TLC plate?

A

Iodine
Sulfuric acid
PMA

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6
Q

What two things did we use in the TLC lab to develop and visualize the spots on the TLC plates?

A

Vinegar

Ammonia

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7
Q

What does Rf stand for?

A

Retention factor

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8
Q

How is the Rf value defined?

A

The ratio of the distance traveled by a particular compound to the distance traveled by the solvent front

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9
Q

What did we soak the filter paper with during the TLC lab?

A

Ethanol:Water

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10
Q

What was our eluent in the TLC lab?

A

Ethanol:Water

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11
Q

What are the three components of the universal indicator?

A

Methyl orange
Bromethyl Orange
Trinitrobentic acid

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12
Q

How many sig figs should be used when calculating Rf value?

A

Record to 2 decimal places

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13
Q

Name some colligative properties

A 
Density 
Viscosity
Surface tension 
Boiling point 
Freezing point 
Osmotic pressure 
Vapor pressure
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14
Q

What is a colligative property?

A

Any property that is affected by the amount of solute particle present

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15
Q

What are the units of the freezing point constant? (Kf)

A

K/m

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16
Q

What acid did we use in the freezing point depression lab to determine its molecular weight?

A

Stearic acid

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17
Q

What are the 6 sections that should appear in every lab report?

A 
Purpose 
Pre lab assignment 
Procedure 
Data/observations 
Calculations/analysis 
Conclusion
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18
Q

What do the variables stand for in Beer’s Law

A=elc

A

A=absorbable
e=constant
l=cell path length
c=concentration

19
Q

What are the variables in the Arrhenius equation?

A

A=frequency factor
Ea=activation energy
R=universal gas constant
T=temperature in K

20
Q

How can you calculate the activation energy of a reaction given a graph?

A

Multiply the slope by R

21
Q

What is the universal gas constant?

A

8.314J/(mol•K)

22
Q

What exactly is the activation energy?

A

The energy value that must be overcome to turn reactants into products

23
Q

Equation of iron and phenanthroline

A

Fe + 3 phenan. —-> Fe (phen)

                               Orange
24
Q

What are ligands?

A

Molecules that are able to form coordinate covalent bonds with transition metals

25
Q

Example of Ligands

A

Ammonia
Water
Hydroxide

26
Q

Decomposition of 1,10 phenanthroline

A

Fe(phen) (2+) —-> Fe + 3 phen

Red/orange. Colorless

27
Q

What was used as a catalyst in the chemical kinetics lab?

A

Sulfuric acid

28
Q

Describe le chatliers principe

A

If stressed is placed on system things shift to reduce stress

29
Q

What is heterogenous equilibrium?

A

Phases aren’t the same

30
Q

What is a saturated solution?

A

Some salt is in excess of Jenkins that dissolve in the solution

31
Q

What is homogenous equilibrium?

A

All ions or complexes are in he same phases

32
Q

Fe(3+) + SCN(-) —–> Fe(SCN) (2+)

Colorless Red

A

Thresh

33
Q

What is the common ion effect

A

2 dissolved solutes that contain the same ion

34
Q

Example of be common ion effect

A

NaCl and HCl

35
Q

Acidic solution in terms of H+

A

> 1.0 • 10^-7

36
Q

Basic solution in terms of H+

A

<1.0 • 10^-7

37
Q

What is transmittance?

A

Amount of light that passed through a solution

38
Q

What is absorbance?

A

Amount of light grasped by a solution

39
Q

Is water a weak or strong electrolyte?

A

Weak

40
Q

Equation for ionization of water

A

H2O H+ + OH-

41
Q

What two ions does the ionization of water produce?

A

Hydrogen cation

Hydroxide anion

42
Q

Ph for acidic solutions

A

<6

43
Q

Ph for neutral solutions

A

6-8

44
Q

Ph for basic solutions

A

> 8

Chemistry Lab final (1 decks)

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