Lesson 4: Pure substances and mixtures

• Scheikunde
• Middelbare school
• havo, vwo
• Leerjaar 3

Exercises of 1.1, questions that arose?

1, 2, 3, 5, 7, 8, 11, 13 and 14 from paragraph 1.1

Pure or mixture?

Activating prior knowledge

Last year we've discussed substances.

How can you identify a substance?

Which substance properties are there?

Notes, copy in your notebook.

A pure substance is a substance with only one type of molecule

A mixture is a substance with multiple types of molecules.

Each substance is identifiable by its properties.

 

Guess the word(s)

Guess the word(s)

Three phases

A substance is encountered in daily life in one of the three phases.

either it is: Solid, Liquid or Gaseous.

somtimes we also use substances dissolved in water

Guess the word(s)

Points and ranges

If you have a mixture, it has substance properties of both materials. It no longer has a set boiling temperature (point) or melting temperature (point) but it now has a range of boiling and melting temperature. You can use this to see if a substance is a pure substance or mixture.

Now go and read paragraph 1.2

Do exercises: 15, 17, 19, 20, 21, 22, 24, 25, 26, 29, 30

Application/Outcome

End Slide