Les 3

• Nask / Techniek
• Middelbare school
• mavo, havo, vwo
• Leerjaar 2

Welcome

NTEC2

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iPad and notebook?

Welke smiley past het meest bij je vandaag?

1. :)
2. :|
3. :(

Rough planning

lesson 1: Section 1 + 2

Lesson 2: Section 2 (Experiment)

-> Lesson 3: Section 3 <-

Lesson 4: Section 4

Lesson 5: Grade exercise

Lesson 6: Waterpump

Lesson 7: Waterpump

Section 2 + 3

We'll talk about phases, and the density of water.

After that we'll start on section 3 about the force of water.

Goals

- After this class you can tell me the three different phases.

- After this class you can describe the difference between a melting point and a melting range. 

Repetition quiz

A little quiz about the last few weeks.

You did an exercise about density of an object. What does density mean?
(g/cm3 or kg/m3)

1. The amount of volume per mass unit
2. The amount of mass per volume unit
3. How heavy something is
4. How big something is

Convert (water)
1 mL = ... g

1. 0,1
2. 10
3. 1
4. 100

Convert
1 dm3 = ... L

1. 1
2. 10
3. 0,5
4. 2

Convert:
1 Liter = ... cL

1. 1000
2. 10
3. 1
4. 100

If you...

...got all answers right: good for you!

...answered question 1 wrong (density); read page 4 and 5

...answered question 2, 3 or 4 wrong; make exercise 4 again

New material

Calculating density or mass

Phases

Melting point and -range

Calculating density

The density equals the mass divided by volume.

or

density = mass / volume

or

calculating mass 

density = mass / volume

mass = density x volume

11,3 g/cm3

0,7 g/cm3

19,2 g/cm3

 0,001 g/cm3

Phases

Melting point and -range

Exercise 6

make exercise 6; questions 1 to 7

Density of frozen water

Fun exercise for at home!

First: ask a caretaker/parent for permission!

1. fill a small plastic container all the way with water.

2. put the lid on the container

3. put the container in the freezer and let it freeze completely (at least overnight)

4. check on your container a few days later. what happened?

End class

Next lesson: exercise about the forces of water