Pltw 1.1.3 Write Up

Background: In the scientific world, many instruments atomic number 18 efficacious in the discovery of new and exciting things, but how throw out we rely on these instruments if they are uncomplete accurate nor precise. Also, how would adept go about selecting a tool if they dont know the accuracy and precision of it? Accuracy and precision are two words that are used interchangeable when in fact they have very unique definitions as follows:
* trueness: the relative closeness a value has to its intended or true value.
* PRECISION: the relative closeness of a coiffe of values in relation to each other.
An example would be like a target. If the three arrows al unmatchable hit the bulls-eye, they would be accurate and precise. If all three missed but were in the same general area, they were precise but non accurate. Also, if all three missed and were far away from each other, they were neither accurate nor precise. To a scientist a perfect instrument is one that is completely accurate and extremely precise.
gumshoe: Like in every lab done in a science classroom setting and in a professional laboratory, safety device here is vital. Following is a list of safety rules to bear at all times when performing this lab.
1. Always go to pieces goggles to keep chemicals and objects out of the eyes.
2. There is a classification of water and electrical equipment so be sure not to get water near the electrical plugs or sockets.
3.



dainty each instrument with care and use them only as they are to be used.
4. Never fill a pipette with your mouth.
5. Never drink ANY chemicals used in the lab.

Materials: nigh labs need materials. Below is a list of items needed for this lab.
*
* Safety goggles
* Pipet
* Distilled water
* Small beaker for holding water
* Weigh boats
* Carolina brand digital scale
* capital of Colorado brand digital scale
* OHAUS brand digital scale
* OHAUS brand double beam balance
* Micro-pipet (100-1000µL)
* Micro-pipet (20-200µL)
* Micro-pipet (.5-10µL)...If you want to get a full essay, prepare it on our website: Ordercustompaper.com



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