Measurements and Sig Figs

We started the day off today with going over the previous night's metric system HW, answer's to which can be found HERE. All the types of measurements that we're on this sheet, and the ones on the chart of which Stephanie so kindly posted, will be on the quiz tomorow!

We went on to do a little out-of-lab me

asuring. We went over the fact that when measuring, you assume measurements to the last mark you can see, and then estimate the next decimal point. i.e.

We'd measure this fish to be 8 cm but then we would estimate for one more decimal point and measure it to be 8.1 cm. (You are allowed to estimate the next digit to be 0)

The same goes for measuring liquids but its important to remember to measure liquids under the meniscus!

We also learned recapped and extended on significant figures. Although slightly confusing at first, significant figures are not too difficult, Just follow to the rules! (slide 8)

With adding and subtracting measurements the result has the same amount of decimal places as the least accurate measurement. With multiplication and division the product has the same amount of Sig figs as the least accurate measurement.

To represent numbers in chemistry we use Scientific Notation. This is very important and is represented in the above notes. (slide 10)

For tomorow:

-Study for Quiz!

-Do the significant figures worksheet, it will help you for the quiz.

Thank you, Altonji out.

Arthur B.will have it next