LAB #5

Question 1

Unit of solubility

Answer 1

Grams per liter

Question 2

Some solubility or complete miscibility of water

Answer 2

Alcohols, amines, acids esters ketones and aldehydes

Question 3

Some solubility or complete misibility for 5% sodium bicarbonate

Answer 3

Carboxylic acid

Question 4

Some solubility or complete miscibility for 5% sodium hydroxide

Answer 4

Carboxylic acid and phenols

Question 5

Some solubility or complete disability for diethyl ether

Answer 5

Most organic molecules

Question 6

What will happen to the polarity if there is an increase of number of chain

Answer 6

Increase nonpolarity

Question 7

Give examples of an organic solvent

Answer 7

Diethyl ether, dichloromethane, chloroform, petroleum ether, hexanes

Question 8

Chloroform is also known as

Answer 8

Trichloromethane

Question 9

What administrative number and year thus chloroform is banned

Answer 9

AO 341 series of 1978

Question 10

Cocoa butter

Answer 10

Theobroma oil

Question 11

defined as the maximum mass
of a substance that can be dissolved in a
fixed mass of a solvent at a given
temperature.

Answer 11

Solubility

Question 12

True or false

A substance will have a different solubility
in different solvents depending on polarity
of both the substance and the solvent.

Answer 12

True

Question 13

The solubility of an organic compound can
provide evidence

Answer 13

for the presence (or lack)
of several important functional groups,

Question 14

Most of organic molecules are usually
soluble in organic solvents (e.g.

Answer 14

diethyl
ether, dichloromethane, chloroform,
petroleum ether, hexanes etc)

Question 15

is the temperature range
over which the solid melts to become a
liquid

Answer 15

Melting point

Question 16

True or false

The transition between the solid and the
liquid is so sharp for small samples of
pure substance that melting points can be
measured to ± 1oC

Answer 16

True

Question 17

Characteristic of molecule can be
used to determine

Answer 17

identity & purity

Question 18

Four factors influencing melting
point:

Answer 18

1. Molecular symmetry
2. Molecular polarity
3. H-bonding
4. Molecular weight

Question 19

The ability of molecules to pack together
tightly influences

Answer 19

intermolecular
interactions & melting point.

Question 20

shapes have
unusually high melting points

Answer 20

Spherical

Question 21

The boiling point of liquid is affected by the
forces that attract one molecule to

Answer 21

another-ionic attraction , dipole-dipole
interaction, hydrogen bonding & van der
Waals force.

Question 22

True or false

A very liquid in a very clean vessel will
superheat and not boil when subjected to
a temperature above its boiling point

Answer 22

True

Question 23

The difference in boiling point informs the
difference in

Answer 23

Molecule structure

Question 24

is an antiseptic that has boiling
point higher than ether that was used as
general anesthetic.

Answer 24

Phenol

Question 25

measure of how much
the speed of light (or other waves such as
sound waves) is reduced inside the
medium.

Answer 25

Refractive Index

Question 26

It is often used to identify a particular
substance, confirm its purity, or measure
its concentration.

Answer 26

Refractive Index

Question 27

is a measurement that compares the
amount of matter an object has to its
volume.

Answer 27

Density

Question 28

Density can be used to examine the
unknown sample

Answer 28

Qualitatively

Question 29

if it rotates
the plane of polarized light.

Answer 29

Optically active

Question 30

In order for a substance to exhibit optical
activity, it must be _and one
_ must be present in excess of
the other.

Answer 30

Chiral
Enantiomer

Question 31

organic compounds in which a hydrogen
atom of an aliphatic carbon is replaced
with a hydroxyl group

Answer 31

Alcohol

Question 32

Methods of preparation for alcohol

Answer 32

Hydrolysis of alkyl halide
Grignard’s Synthesis
Elimination

Question 33

Oxidizing agents

Answer 33

Periodinane
Chromium trioxide
Sodium chromate

Question 34

Reducing agents

Answer 34

Sodium borohydride
Lithium Aluminum Hydride