This week I learned about scientific notation. Scientific notation is used by scientist and everyday people to show really big numbers or really small numbers. Can you imagine instead of writing 0.0000000056, we write 5.6 x 10^{9}. Are you wondering how this works yet?
Adding and Subtracting :)
Check that all exponents you are adding/subtracting are the same IF the exponents are not the same you must choose which one to change (its recommended to use the one that is bigger)
Example: (3.4 x 10^{6})(4.2 x 10^{3}) = (3.4)(4.2) x 10(^{6}+^{3}) = 14.28 x 10^{9} = 1.4 x 10^{10}
^{(two significant figures)}
Multiplication: The digit are multiplied in the Normal way and the exponents are ADDED.
Example: (6.73 x 10^{5})(2.91 x 10^{2}) = (6.73)(2.91) x 10(^{5}+^{2}) = 19.58 x 10^{3} = 1.96 x 10^{2}
(to 3 significant figures) Division: The digit terms are divided in the normal way and the exponents are subtracted. The quotient is changed (if necessary) so that there is only one nonzero digit to the left of the decimal. (to 2 significant figures) Converting:
converting is used to make one measurement go from one unit to another like converting hours to minutes and that wouldn't be possible with out conversions. When converting you must first look at what unit you have and what you are converting it to. make sure that the unit you want to get rid of goes on top on the first space and than you put in on the bottom
example:
In the image below i want to get rid of lbs so i put lbs my STARTING unit he first set of parenthesis on the bottom to make sure they cancel out. The numbers on the top multiply and those in the bottom divide.
This video better explains how to convert units of measurement
Click here for Converting Calculators!!!!!more links:
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Frania Lugo :) > Chemistry >