The Teachings of 5.1 & 5.3 Period 4 Group 3 Chemistry

Scientific Notation Used as shorthand Units very essential Measurements w/ units

Example 5.53 x Solution:

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

Units sandbag

Units Tells the scale of measurements Common Scientific Units e.g. English lbs. oz. ft. in. Metric g. kg. cm.

Example Question: 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.

Example Question: 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

Can be measured in SI, English, or Metric units.

Volume SI unit is m 3 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?

Solution Anna – 3 brownies with sprinkles Zach – 9 brownies with sprinkles Steven – 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 = unit 2

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:

Quiz Questions: 1. Solve & write in scientific notation. 5,000,000 x 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 inches A box is 62 cm. 1 in. = 2.54 cm

Quiz Answers: 1.20,000,000,000  2.0 x 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: inches

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