1. Lab Skills and Chemical Analysis
S3 UNIT 1
Lab Skills and Chemical Analysis
Metric System

2. Metric System
Context for learning: For the majority of recorded human history, units like the weight of a grain or the length of a hand weren’t exact and varied from place to place. Now, consistent measurements are such an integral part of our daily lives that it’s hard to appreciate what a major accomplishment for humanity they’ve been.
Learning Intentions (WALT):
We are learning to:
Understand the decimal measuring system based on the metre, litre, and gram as units of length, capacity, and mass.
Appreciate the international importance of the system which was first proposed by the French astronomer and mathematician Gabriel Mouton (1618–94) in 1670 and was standardized in Republican France in the 1790s
Extension
Compare and contrast metric system with imperial system/customary system (U.S.A).
Success Criteria(WILF):
What I’m looking for:
Be able to identify the main metric units of measure
Converting within the Metric System Perform arithmetic calculations on metric units of length, mass, and volume.
Using Metric Conversions to Solve Problems Solve application problems involving metric units of length, mass, and volume.
Extension
Form an opinion on whether the U.S.A should convert to the metric system. Write a discursive essay on the topic.

3. New words Meaning GLOSSARY Metrology
the science that deals with measurement.
Measure
to determine the dimension, quantity or capacity of something.
Metric System
the decimal measuring system based on the metre, litre, and gram as units of length, capacity, and weight or mass. The system was first proposed by the French astronomer and mathematician Gabriel Mouton (1618–94) in 1670 and was standardized in Republican France in the 1790s.
Metric Prefix
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or fraction of the unit.
Imperial System
Imperial units or the Imperial system is a collection of units, first defined in the British Weights and Measures Act of 1824. Imperial units are not used in the United States. However the U.S. system of units is similar to the Imperial system which was used officially in the United Kingdom until 1995.
Customary
The customary measurement system is the system of measurement in the United States. This system measures length in inches, feet, yards, and miles; capacity in cups, pints, quarts, and gallons; weight in ounces, pounds, and tons; and temperature in degrees Fahrenheit.

4. Why the metric system matters

5. Metrology The Science of Measurement
This is set up to be an interactive presentation. There are suggested points in the presentation to engage the crowd with questions, I suggest giving mini candy bars for rewards for participation. Keep attention and energy level high.

7. Let’s take a trip back in time…
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SERVING THE WORLD OF MEASUREMENT

8. Prehistoric people didn’t have time to measure
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9. But over time….people started growing food
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10. and developing permanent settlements
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11. So, they needed a system of measurement…
or there would be mayhem!
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12. History of Measurement
Quiz crowd to guess time of first standard, maybe give definition of standard
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13. Egyptian Cubit Used to build pyramids Dependent on the pharaoh
Missed calibration was punishable by death!
cubit
noun
an ancient measure of length, approximately equal to the length of a forearm. It was typically about 18 inches or 44 cm, though there was a long cubit of about 21 inches or 52 cm.
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14. Fast-forward 5000 years to current measurement systems
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15. Metric System (SI) SEVEN BASE UNITS International System
Mass Kilogram (kg)
Length Meter (m)
Time Second (s)
Temperature Kelvin (K)
Electric Current Ampere (A)
Amount of Substance Mole (mol)
Luminous Intensity Candela (cd)
International System
of Measurement
Quiz crowd to name all base units
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16. Metric System (SI) Simple to use
Bases of ten
All other units derived from primary seven
For example: V = cm3 = 1 mL
Maybe quiz crowd about benefits of using metric system
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17. Why Kilogram instead of gram?

20. Prefix Meaning Length Mass Capacity
Kilo -
Thousand (1000)
kilometre
kilogram
kilolitre
Hecto -
Hundred (100)
hectometre
hectogram
hectolitre
Decka -
Ten (10)
deckametre
deckagram
deckalitre
*base unit
One (1)
metre
gram
litre
Deci -
Tenths (0.1)
decimetre
decigram
decilitre
Centi -
Hundredths (0.01)
centimetre
centigram
centilitre
Milli -
Thousandths (0.001)
millimetre
milligram
millilitre

21. mm cm m km Convert 12 metres to centimetres = 1 200 cm
Divide by 10
Divide by 100
Divide by 1000 mm cm m km
Multiply by 10
Multiply by 100
Multiply by 1000
Convert 12 metres to centimetres
Convert 3 kilometres to millimetres
Convert 1.75 metres to millimetres
= cm
= mm
= mm

22. mg g kg Convert 350 grams to kilograms
Divide by 1000
Divide by 1000 mg g kg
Multiply by 1000
Multiply by 1000
Convert 350 grams to kilograms
Convert milligrams to kilograms
Convert kilograms to grams
= 0.35 kg
= 4.4 kg
= 56 g

23. mL cL L Convert 1.2 litres to centilitres = 120 cL
Divide by 10
Divide by 100 mL cL L
Multiply by 10
Multiply by 100
Convert 1.2 litres to centilitres
Convert 3300 millilitres to litres
Convert 75 centilitres millilitres
= 120 cL
= 3.3 L
= 750 mL

25. On whiteboards, convert the following:
7 m to cm
6000 mg to g
0.5 L to mL
9 cm to mm
75 cm3 to mL
450 cL to L
370 m to km
190 mL to cL
8500 L to m3

27. Answers A: Lengths 600 cm 21 cm 5300 m 84 cm 0.054 km 67 000 mm
B: Weights
3 kg
5000 g
0.56 kg
0.035 kg
9480 g
0.256 kg
C: Volumes
2 L
50 L
45 L mL
52.5 cL
465.4 L
D: Exam Questions
140 mL = 0.14 L, Logan is wrong
= 19.5 km, Tony did not run 20 km
Amy is 1.83 m

28. Kahoot revision
Metric length
Metric mass and volume
Metric volume