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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.
Some number used in science are just too big to write out…
For example:
There are a 602,000,000,000,000,000,000 hydrogen atoms in a gram of hydrogen.
An atom of Au has a mass of 0.000000000000000000000327 gram
So what do we do?
5.
A number in scientific notation is a product of two numbers:
A coefficient (1≤X<10)
10 raised to a power
Ex: 645,000
Scientific notation: 6.45 X 10 5
This is the same as saying 6.45 X 10 X 10 X 10 X 10 X 10
6.
Ex: 0.000045
Scientific Notation: 4.5 X 10 -5
This is the same as saying 4.5 ÷ 10 ÷ 10 ÷ 10 ÷ 10 ÷ 10
7.
Ex: 7.054 X 10 6
Ex: 4.7 X 10 -7
8.
Please complete 1-43 ODD on your own
9.
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
10.
1. How many years are in a CENTury?
How many CENTimeters are in a meter?
A centimeter is 1/100 th of a meter
How many grams are in a KILOgram?
Take a look at the handout…
11.
Making the connection…
We know that there are 100cm in 1 meter. But how do I determine how many centimeters are in an inch?
12.
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 .