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

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Pure substances properties

Pure substances, properties


Pure substances properties

Matter

mixtures

Pure substances

Contain only one type of particle

heterogeneous

homogeneous

compounds

elements

Suspension

Colloid

Solution

?


Pure substances properties

Contain only one type of particle

Pure substances

compounds

elements

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.

Hydrogen

Oxygen

Oxygen


Pure substances properties

  • Work book page 14 # 1


Periodic table of elements

Periodic table of elements

name

Atomic number

Atomic symbol

Atomic weight


Pure substances properties

  • Notes pure substances

  • Practice page 14 No2 and 3


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?

air

water

steel

No!

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

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


Pure substances properties

  • Notes on characteristic physical properties


Practice

Practice

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.

Acid

Base


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

http://www.youtube.com/watch?v=1PLH4H7Mjl8


Reaction to an open flame

Reaction to an open flame

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

Ba

Na

K


Pure substances properties

  • Notes characteristic properties


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