Pure substances properties
Download
1 / 22

Pure substances , properties - PowerPoint PPT Presentation


  • 126 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Pure substances , properties ' - virgil


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Pure substances properties

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

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



Periodic table of elements
Periodic table of elements

name

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?

air

water

steel

No!

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

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



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


  • Notes characteristic properties


ad