2.2B Substances mixtures

• Natuurkunde
• Middelbare school
• vwo
• Leerjaar 2

Today

Test: Wednesday 13 november

Mixtures

Check homework

Mass & Volume calculations (2.3)

Mass & Volume measurements (2.3)

Separation methods (2.2)

What is made of only one kind of molecule?

1. emulsion
2. pure substance
3. solution
4. suspension

A tea bag is a quick way of making tea. In this situation the tea leaves are the

1. solvent
2. filter
3. filtrate
4. residue

A tea bag is a quick way of making tea. In this situation the resulting tea is the

1. solvent
2. filter
3. filtrate
4. residue

Homework: questions?

Check: knowledge and skills 2.1 & 2.2

Mass

Variable: m

Unit: kg

Measuring instrument: scale

Volume

Variable: V

Unit: m³

Equation: V = l*b*h

V = π*r²

Measuring instrument: measuring cylinder

Reading a measuring cylinder

Practical: Suspensions vs solutions

• goal: 2 identifying  features
• wiggle
• 20 minutes
• work in pairs
• read the instructions carefully
• ask teacher when you don't understand anything
• once finished: 1. clean up 2 write conclusion

What are the two differences between a solution and a suspension?

Exercises

• 25, 26 & 27
• Knowledge & skills list 2.1 & 2.2