1.2 Pure substances and mixtures

• Scheikunde
• Middelbare school
• havo
• Leerjaar 3

Pure substances and mixtures

Paragraph 1.2

What substance properties do you know?

Substance properties

Characteristics which identify a substance

Examples:

Odor, color, taste, flammibility

Not substance properties:

Temperature, shape, mass, volume

Molecular model

Each substance consist of molecules

Each substance has its own kind of molecules.

Molecules are the smallest part of a substance.

Are molecules ever visible?

Judge yourself

Pure substance                       Mixture

Is milk a mixture or a pure substance?

1. Mixture
2. Pure substance

Is ammoniak a mixture or a pure substance?

1. Mixture
2. Pure substance

Substance properties

No substance properties

color

odor

melting point

boiling point

mass

volume

density

phase at  room temperature

temperature

solubility in water

solubility in oil

A molecule ...

1. ... is a mixture.
2. ...is 1mm large.
3. ... can be seen with the naked eye.
4. ...is the smallest part of substance.