The Teachings of 5.1 The Teachings of 5.1 & 5.3& 5.3
The Teachings of 5.1 The Teachings of 5.1 & 5.3& 5.3Period 4Period 4Group 3Group 3
Chemistry
Scientific Notation• Used as shorthand• Units very essential• Measurements w/ units
Example 5.53 x 10 -4
.000553 Solution: .000553
Scientific Notation & Units
• Simplified form to write• Units help describe measurements• All about accuracy!
Step-by-step how to do Scientific Notation
• 1. write number in standard notation• 2. add decimal point after the last digit• 3. move decimal point to the left until
you only have on digit in front of it.• 4. cross out the zeros at the end• 5. Re-write the number as decimal x
10^x (x = # of times you moved the decimal to the left)
Scientific Notation
Unitssandbag
Units• Tells the scale of measurements• Common Scientific Units e.g. English lbs. oz. ft. in. Metric g. kg. cm.
ExampleQuestion: What kind of units does
the English system use?Solution: The English system use
units such as pounds, ounces, cups, inches, and miles
Measurements• Lengths - SI unit of length is meter.• Volume - amount of 3-dimensional space
occupied by a substance.• Mass - quantity of matter present in an object.
ExampleQuestion: Why would a person
choose a smaller units to measure an object, rather than larger units?
Solution: By choosing smaller units to measure and objects, you are much more accurate with your results. Therefore, you have less errors.
Length
Length• Can be measured in SI, English, or
Metric units.
Volume• SI unit is m3
• Volume measure how much something can hold.
Mass• Metric unit is gram• SI fundamental unit is kilogram
Problem Solving • Help solve equations• Convert units• Be systematic
Example Anna, Zach, and Steven made 60
brownies together. Anna made 18 and put sprinkles
on 1/6 of them. Zach made twice as many brownies as Anna and put sprinkles on ¼ of them. Steven made 1/3 as many brownies as Anna and put sprinkles on all of them. How many brownies had sprinkles?
SolutionAnna – 3 brownies with sprinklesZach – 9 brownies with sprinklesSteven – 6 brownies with sprinkles
18 brownies had sprinkles
Problem Solving• Ask questions suck as:- Where?- What do we know?- How do we get there?- Does it make sense?
Conversion Factor• Def: ration of 2 parts of equation
that shows relationship• Unit x conversion factor = unit2
Conversion Factor• How to• Find equivalence statement
that relates 2 units• Choose conversion factor• Multiply original quantity by
conversion factor• Make sure you have correct
# of significant figures
• Ex: how do you convert from unit to another?
• Solution:
QuizQuestions: 1. Solve & write in scientific notation.5,000,000 x 40002. For what use would you apply units in daily life?3. What units are most appropriate to measure long distances, such as
city distances?4.Vicky decided to hike a 12 mile trail through the Hills. She began her
hike at 9:20 in the morning. After Vicky traveled 1/3 of the distance she looked at her clock and it was 10:05 AM. If she continues to walk at that pace, what time will she finish?
5. Convert into inchesA box is 62 cm. 1 in. = 2.54 cm
QuizAnswers: 1. 20,000,000,000 2.0 x 1010
2. You would use units in daily life to cook up a recipe, fill up gas, pay the bills, and chemistry homework.
3. Miles 4. 11:35 5. 24 inches
Links• http://www.coolmath.com/prealgebra/02-decimals/images/decimals01-3.gif
• http://image.versiontracker.com/scrnsht/54391/174782/16Scientific_Notation_Screenshot.png
• http://www.avertdisasters.org/images/publicdocs/HomeFloodCntrl/home8b~1.gif
• http://gnomecoder.files.wordpress.com/2007/09/gnome-screen-ruler.png
• http://www.clker.com/cliparts/f/f/4/4/121617897960609915lemmling_2D_cartoon_elephant.svg.hi.png
• http://openclipart.org/people/lemmling/lemmling_Simple_cartoon_mouse.png