Unit+Conversion

=UNIT CONVERSION =

Definition of some important words: Unit Conversion  a calculation method which uses conversion factors to change the units associated with an expession to a different set of units. Conversion Factor  is a fractional expression relating or connecting two different units.

other words need to know: Unknow Amount, Initial Amount, Conversion Statement Any fact about equivalence of units can be written as a conversion factor. For example, a U.S liquid quart is equivalent to about 946 cubic centimeters:
 * 1qt = 946cm ** 

If both sides of this equivalence relation are divided by 1 qt, ** 1= 946cm3 /1qt ** A fraction with that relates units and is equal to 1 is called a **__conversion factor__** <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">. The conversion factor would be read as "946 cubic centimetersper quart". Notice that the word per means "divided by". The conversion factor could also have been written: which reads"one quart per 946 cubic centimeters".
 * 1qt/946cm3 **

<span style="color: #fa6666; font-family: Impact,Charcoal,sans-serif; font-size: 150%;">★ HERE ARE FEW MORE EXAMPLES $306.36 || 1.66×10-27 kg || 1.00 g water ||
 * **<span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">Statement ** || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">[[image:/chem/senese/101/images/dot.gif width="1" height="1"]] || **<span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">Equivalence relation ** || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">[[image:/chem/senese/101/images/dot.gif width="1" height="1"]] || **<span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">Conversion factor ** ||
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">1 oz of gold is worth $306.36. || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">[[image:/chem/senese/101/images/dot.gif width="1" height="1"]] || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">1 oz gold = $306.36 || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">[[image:/chem/senese/101/images/dot.gif width="1" height="1"]] || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">__1 oz gold__
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">The masses of atomic nuclei are measured in daltons. A dalton is a mass of 1.66×10-27 kg. || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">[[image:/chem/senese/101/images/dot.gif width="1" height="1"]] || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">1 dalton =1.66×10-27 kg || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">[[image:/chem/senese/101/images/dot.gif width="1" height="1"]] || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">__1 dalton__
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">One cubic centimeter of water weighs about 1.00 g. || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">[[image:/chem/senese/101/images/dot.gif width="1" height="1"]] || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">1 cm3 water = 1.00 g water || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">[[image:/chem/senese/101/images/dot.gif width="1" height="1"]] || <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">__1 cm3 water__

※When a statement applies to a specific material only, include the name of the material in the conversion factor's units to avoid confusion.

<span style="color: #fa6666; font-family: Impact,Charcoal,sans-serif; font-size: 170%;">☆ small quiz！ 【answer will be in the end of this page~】

<span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">"Osmium (Os) is the one of the heaviest metals known; a 1 cm3 cube of osmium weights 22.50 g. For comparison, the same volume of lead (Pb) would weigh less than half as much, 11.34 g". Which of the following would **not** be a valid conversion factor based on these statement？ 1. 11.34g Pb / 1mL Pb 2. 1 cm3 Os / 22.50 g Os 3. 22.50 g Os / 1 cm3 Os 4. 11.34 g / 1 cm3

<span style="color: #800080; font-family: Impact,Charcoal,sans-serif; font-size: 170%;">Converting Units
<span style="color: #000080; font-family: 'Comic Sans MS',cursive; font-size: 130%;">5 step plan for converting units <span style="color: #000080; font-family: 'Comic Sans MS',cursive; font-size: 130%;">Common variations
 * 1) <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">identify the unknown, including units
 * 2) <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">choose a starting point
 * 3) <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">list the connecting conversion factors
 * 4) <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">multiply starting measurement by conversion factors
 * 5) <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">check the result: does the answer make sense?
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">series of conversions
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">example: Americium (Am) is extremely toxic; 0.02 micrograms is the allowable body burden in bone. How many ounces of Am is this?
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">converting powers of units
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">converting compound units
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">starting point must be constructed

<span style="color: #000080; font-family: 'Comic Sans MS',cursive; font-size: 130%;">using derived units as conversion factors
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">mass fractions (percent, ppt, ppm) convert mass of sample into mass of component
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">density converts mass of a substance to volume
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">velocity converts distance traveled to time required
 * <span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">concentration converts volume of solution to mass of solute

<span style="color: #fa6666; font-family: Impact,Charcoal,sans-serif; font-size: 160%;">ANSWER FOR THE SMALL QUIZ!

<span style="font-family: 'Comic Sans MS',cursive; font-size: 130%;">Correct answer: 11.34 g / 1 cm3


 * Hints:** 1. The relationship between grams and cubic centimeters is different for different metals. 2. 1 cm3 is the same thing as 1 mL.
 * Solutions:** 1. You must include the name of the material as part of the unit, whenever relationships that involve that unit depend on the material. 11.34 g = 1 cm3 implies that the relationship applies for any material. It only applies to lead, so it should be written as 11.34 g Pb = 1 cm3 Pb.

<span style="font-family: 'Comic Sans MS',cursive; font-size: 160%;">Here are some practices to look at: []

If you hav any questions about unit conversion, you can go to this website：

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