Measurement
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Transcript of Measurement
![Page 1: Measurement](https://reader036.fdocuments.us/reader036/viewer/2022062705/5564beddd8b42a3e618b5462/html5/thumbnails/1.jpg)
When you come in, please get out your lab materials from yesterday. Do what you need to do to complete the lab (weigh sand) and complete the calculations. I will be collecting it in fifteen to twenty minutes. Finish up! If you are done, study for the quiz today.
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Section 3.1-3.3
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A measurement contains two things:1.Number2.Unit
The unit typically used in the sciences are those of the International System of Units.
Quantity SI base Unit Symbol
Length Meter m
Mass Kilogram kg
Temp Kelvin K
Time Second s
Amount of substance
Mole mol
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Some number used in science are just too big to write out…For example: 1.There are a 602,000,000,000,000,000,000 hydrogen atoms in a gram of hydrogen.2.An atom of Au has a mass of 0.000000000000000000000327 gram
So what do we do?
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A number in scientific notation is a product of two numbers:1.A coefficient (1≤X<10)2.10 raised to a power
Ex: 645,000Scientific notation: 6.45 X 105
This is the same as saying 6.45 X 10 X 10 X 10 X 10 X 10
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Ex: 0.000045
Scientific Notation: 4.5 X 10-5
This is the same as saying 4.5 ÷ 10 ÷ 10 ÷ 10 ÷ 10 ÷ 10
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Ex: 7.054 X 106
Ex: 4.7 X 10-7
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Please complete 1-43 ODD on your own
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The unit typically used in the sciences are those of the International System of Units.
Quantity SI base Unit Symbol
Length Meter m
Mass Kilogram kg
Temp Kelvin K
Time Second s
Amount of substance
Mole mol
![Page 10: Measurement](https://reader036.fdocuments.us/reader036/viewer/2022062705/5564beddd8b42a3e618b5462/html5/thumbnails/10.jpg)
1. How many years are in a CENTury?
2.How many CENTimeters are in a meter?• A centimeter is 1/100th of a meter
3.How many grams are in a KILOgram?
4.Take a look at the handout…
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Making the connection…
We know that there are 100cm in 1 meter. But how do I determine how many centimeters are in an inch?
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Accuracy: How does your value compare to a known (or accepted value)?
Precision: How does one of your values compare to all of them? If you take multiple measurements, are they all close in value?
Tips for the lab: It does not necessarily matter where you measure from exactly. Just be sure that the length you measure in inches is exactly that same length you measure in centimeters .
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HW due Monday: pg 58-59 (#36 37, 38, 39, 44, 45, 46, 48, 49a, 52, 54, 55, 56, 67, 69, 70)
Tonight: Suggested Readings (3.1-3.3)
Tomorrow: Sig Figs (3.1)
Thursday: Dimensional Analysis (3.3)
Check out the Helpful websites – There is a good site describing physical and chemical properties and changes.