Lesson 4: Pure substances and mixtures

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

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.

Exercises of 1.1

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

When you're done start with reading paragraph 2 and start with exercises: 15, 17, 19, 20, 21, 22, 24, 25, 26, 29, 30

Now go and read paragraph 1.2

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

Application/Outcome

End Slide