Final

Question 0

What does TLC stand for?

Answer 0

Thin Layer Chromatography

Question 1

What is the mobile phase of TLC experiment?

Answer 1

The solvent

Question 2

What are 4 reasons why TLC is used?

Answer 2

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

Question 3

How does the compound rise up the TLC plate?

Answer 3

By capillary action

Question 4

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

Answer 4

Least tightly absorbed to the stationary phase

Question 5

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

Answer 5

Iodine
Sulfuric acid
PMA

Question 6

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

Answer 6

Vinegar

Ammonia

Question 7

What does Rf stand for?

Answer 7

Retention factor

Question 8

How is the Rf value defined?

Answer 8

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

Question 9

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

Answer 9

Ethanol:Water

Question 10

What was our eluent in the TLC lab?

Answer 10

Ethanol:Water

Question 11

What are the three components of the universal indicator?

Answer 11

Methyl orange
Bromethyl Orange
Trinitrobentic acid

Question 12

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

Answer 12

Record to 2 decimal places

Question 13

Name some colligative properties

Answer 13

Density 
Viscosity
Surface tension 
Boiling point 
Freezing point 
Osmotic pressure 
Vapor pressure

Question 14

What is a colligative property?

Answer 14

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

Question 15

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

Answer 15

K/m

Question 16

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

Answer 16

Stearic acid

Question 17

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

Answer 17

Purpose 
Pre lab assignment 
Procedure 
Data/observations 
Calculations/analysis 
Conclusion

Question 18

What do the variables stand for in Beer’s Law

A=elc

Answer 18

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

Question 19

What are the variables in the Arrhenius equation?

Answer 19

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

Question 20

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

Answer 20

Multiply the slope by R

Question 21

What is the universal gas constant?

Answer 21

8.314J/(mol•K)

Question 22

What exactly is the activation energy?

Answer 22

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

Question 23

Equation of iron and phenanthroline

Answer 23

Fe + 3 phenan. —-> Fe (phen)

                               Orange

Question 24

What are ligands?

Answer 24

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

Question 25

Example of Ligands

Answer 25

Ammonia Water Hydroxide

Question 26

Decomposition of 1,10 phenanthroline

Answer 26

Fe(phen) (2+) ----> Fe + 3 phen Red/orange. Colorless

Question 27

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

Answer 27

Sulfuric acid

Question 28

Describe le chatliers principe

Answer 28

If stressed is placed on system things shift to reduce stress

Question 29

What is heterogenous equilibrium?

Answer 29

Phases aren't the same

Question 30

What is a saturated solution?

Answer 30

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

Question 31

What is homogenous equilibrium?

Answer 31

All ions or complexes are in he same phases

Question 32

Fe(3+) + SCN(-) -----> Fe(SCN) (2+) Colorless Red

Answer 32

Thresh

Question 33

What is the common ion effect

Answer 33

2 dissolved solutes that contain the same ion

Question 34

Example of be common ion effect

Answer 34

NaCl and HCl

Question 35

Acidic solution in terms of H+

Answer 35

>1.0 • 10^-7

Question 36

Basic solution in terms of H+

Answer 36

<1.0 • 10^-7

Question 37

What is transmittance?

Answer 37

Amount of light that passed through a solution

Question 38

What is absorbance?

Answer 38

Amount of light grasped by a solution

Question 39

Is water a weak or strong electrolyte?

Answer 39

Weak

Question 40

Equation for ionization of water

Answer 40

H2O H+ + OH-

Question 41

What two ions does the ionization of water produce?

Answer 41

Hydrogen cation | Hydroxide anion

Question 42

Ph for acidic solutions

Answer 42

<6

Question 43

Ph for neutral solutions

Answer 43

6-8

Question 44

Ph for basic solutions

Answer 44

>8