Pure substances properties
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Pure substances , properties. Matter. mixtures. Pure substances. Contain only one type of particle. heterogeneous. homogeneous. compounds. elements. Suspension. Colloid. Solution. ✗. ?. Contain only one type of particle. Pure substances. compounds. elements.

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Pure substances properties

Pure substances, properties



Pure substances

Contain only one type of particle









Contain only one type of particle

Pure substances



At least two types of atoms, that have chemically combined

 Can be separated into constituent elements

Only one type of atom

(there may be more than one of the same kind!)

 Impossible to separate into other substances with chemical separation techniques.




Periodic table of elements
Periodic table of elements


Atomic number

Atomic symbol

Atomic weight

Identifying pure substances
Identifying pure substances:

Using properties that are specific to asubstance or a small group of substances.

Characteristic Properties

Non Characteristic Properties:

  • All substances have these properties

  • Mass - temperature

  • shape - state of matter

Characteristic properties
Characteristic properties

1. Physical properties

2. Chemical properties

During course of identification process substance reacts with another substance and will change

  • No change of the identity / nature of the substance during test process

Physical properties melting point
Physical properties: Melting point

  • The temperature at which a solid becomes a liquid (or a liquid becomes a solid)

Melting point water:

0 °C

Melting point ethanol:

- 117 °C

Physical properties boiling point
Physical properties: Boiling point

  • The temperature at which a liquid becomes a gas (or a gas becomes a liquid)

Boiling point water:

100 °C

Boiling point ethanol:

78 °C

Physical properties solubility
Physical properties: solubility

  • Maximum amount of solute, that can be dissolved in a given volume of solvent

  • Expressed in units of concentration g/L, %m/v, %m/m or %v/v

Physical properties density
Physical properties: density

  • Do they have the same weight?





Density = Mass per unit volume (in g/mL):

I always indicate how much 1 ml of the substance weighs.


1. A rock with the volume of 22 ml weighs 37.4 g; what is its density?

2. The mass of a plastic spoon 7.5 g and its volume is 3 ml; what is its density?

3. The density of silver is 10.4 g/ml. If a sample of pure silver has a volume of 13 ml, what is its mass?

Characteristic chemical properties
Characteristic Chemical Properties

  • Help us identify a substance but may changethe nature of the substance during the process. 

  • Ex: Reaction to litmus paper, Reaction to cobalt Chloride Paper, Reaction to limewater, Reaction to a glowing splint, reaction to a burning splint, reaction to an open flame.

Reaction to litmus paper
Reaction to litmus paper

  • Can identify if a substance is acidic or basic.



Reaction to cobalt chloride paper
Reaction to cobalt chloride paper

  • Turns pink in the presence of water.

no water

with water

Reaction to limewater
Reaction to limewater

  • Turns Cloudy in the presence of CO2

Reaction to glowing splint
Reaction to glowing splint

  • Splint reignites in the presence of oxygen

A pair of bellows uses the same principal to reignite a fire

Reaction to burning splint
Reaction to burning splint

  • An explosion will occur in the presence of hydrogen.

Hindenburg in 1937


Reaction to an open flame
Reaction to an open flame

The color of the flame may indicate the presence of certain substances.




  • Notes characteristic properties