Experiment 2: Identification Of A Compound: Physical Properties

Question 0

Solubility of a substance

Answer 0

Is the maximum mass ( usually in grams) that dissolves in a fixed mass ( usually 100g) of a solvent at a given temperature

Question 1

Physical properties

Answer 1

Can be observed or measured without any knowledge of chemical reactivity of substance.

Question 2

C2h5OH

Answer 2

Ethanol

Question 3

(CH3)2CO

Answer 3

ACETONE

Question 4

a substance is considered to be soluble when it achieve.

Answer 4

COMPLETE DISSOLUTION

Question 5

DENSITY of a substance

Answer 5

Is its mass per unit volume

A substance with a high density has a large mass in a small volume. ( a substance need not be large to have a high density)

Question 6

MELTING POINT

Answer 6

a solid that is slowly heated changes completely to a liquid phase at specific temperature called the the MELTING POINT.

At the melting point the olid and liquid phases coexist; any lowring of the temperature results in the formation of only solid and any raising of temperature results in the existence of only liquid phae

Question 7

IMMISCIBLE

Answer 7

2 liquids are immiscible when they are insoluble in each other

Question 8

BOILING POINT

Answer 8

The temperature at which the vapor pressure ( the pressure exerted by a vapor when it is in dynamic equilibrium with its liquid) of a liquid equal atmospheric pressure.

. It is the temperature at which bubbles form spontaneously and continue to form until the volume of the liquid has bee converted to gas.

. it is the temperatue where liquid and vapor phases coexist.

. The boiling point depends on the prevailing atmospheric pressure

Question 9

Atmospheric Pressure

Answer 9

The force ( or weight) that a column of air exerts over an area over the earth’s surface.

Question 10

Intermolecular Forces

Answer 10

Interactive attractions and repulsion between molecule
e.g.
Melting point
Boiling points of substance:

As the the magnitude of intermolecular forces is different for each substance, each has a characteristic melting point and boiling point.

Question 11

When does one record the boiling point

Answer 11

After discontinuing heat when the bubbles cease to escape and before the liquid reenters the capillary tube. This is the boiling point of the liquid

Question 12

When should the melting point be reported

Answer 12

As a a range of 2 temp. 1. when the sample appears we
2. when the entire temp is liquid

A range of 1-2 degrees indicates a pure substance.
The more impure the substance the more wide the temperature range.

Question 13

(CH3)2CO

Answer 13

ACETONE

Question 14

a substance is considered to be soluble when it achieve.

Answer 14

COMPLETE DISSOLUTION

Question 15

DENSITY of a substance

Answer 15

Is its mass per unit volume

A substance with a high density has a large mass in a small volume. ( a substance need not be large to have a high density)

Question 16

MELTING POINT

Answer 16

a solid that is slowly heated changes completely to a liquid phase at specific temperature called the the MELTING POINT.

At the melting point the olid and liquid phases coexist; any lowring of the temperature results in the formation of only solid and any raising of temperature results in the existence of only liquid phae

Question 17

IMMISCIBLE

Answer 17

2 liquids are immiscible when they are insoluble in each other

Question 18

BOILING POINT

Answer 18

The temperature at which the vapor pressure ( the pressure exerted by a vapor when it is in dynamic equilibrium with its liquid) of a liquid equal atmospheric pressure.

. It is the temperature at which bubbles form spontaneously and continue to form until the volume of the liquid has bee converted to gas.

. it is the temperatue where liquid and vapor phases coexist.

. The boiling point depends on the prevailing atmospheric pressure

Question 19

Atmospheric Pressure

Answer 19

The force ( or weight) that a column of air exerts over an area over the earth’s surface.

Question 20

Intermolecular Forces

Answer 20

Interactive attractions and repulsion between molecule
e.g.
Melting point
Boiling points of substance:

As the the magnitude of intermolecular forces is different for each substance, each has a characteristic melting point and boiling point.

Question 21

When does one record the boiling point

Answer 21

After discontinuing heat when the bubbles cease to escape and before the liquid reenters the capillary tube. This is the boiling point of the liquid

Question 22

When should the melting point be reported

Answer 22

As a a range of 2 temp. 1. when the sample appears we
2. when the entire temp is liquid

A range of 1-2 degrees indicates a pure substance.
The more impure the substance the more wide the temperature range.