bell work:
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Bell Work:. Please get a text book and read the following pages silently; page 32-33. Everyone should be quiet at this time. Measurements/Calculations. Analyzing Data. Objectives:. Define SI Base Units Explain how adding a prefix changes a unit Convert between Metric Units - PowerPoint PPT PresentationTRANSCRIPT
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Bell Work:
Please get a text book and read the following pages silently; page 32-33.
Everyone should be quiet at this time.
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Measurements/Calculations
Analyzing Data
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Objectives:
Define SI Base Units
Explain how adding a prefix changes a unit
Convert between Metric Units
Determine Accuracy/Precision
Determine Significant Figures.
Calculate Significant Figures.
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Why do chemists use SI units(do not copy this question)?
Chemists use an internationally recognized system of units to communicate their findings.
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What are SI Units?
Systeme Internationale d’Unites (SI) is an internationally agreed upon system of measurements.
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SI Base Units
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SI Prefixes
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Metric Conversions: Problem Solving 1000gram = _______ kilograms
1 25 milliliters = ______ liters
.025 35 hectograms = ______ centigrams
350000 409 meters = ____ decimeters
4090
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What are Accuracy & Precision? Accuracy – how close the measurement is
to the true or actual value.
Example: Actual Value = 2.50
Which one of these values is accurate?
2.49, 2.30, 2.31, 2.32
Precision – the exactness of measurement
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What is a Significant Figure?
Significant figure – all the digits know plus one estimated or uncertain number.
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RULES FOR DETERMINING SIGNIFICANT FIGURES
1. NON-ZERO NUMBERS ARE ALWAYS SIGNIFICANT.
2. LEADING ZEROS ARE NEVER SIGNIFICANT.
3. IMBEDED ZEROS ARE ALWAYS SIGNIFICANT.
4. TRAILING ZEROS ARE ONLY SIGNIFICANT IF THERE IS A DECIMAL POINT.
4.63 - 3 SIG. FIG
0.000682 - 3 SIG. FIG.
1.072 - 4 SIG. FIG.
300.0 - 4 SIG. FIG. 300 - 1 SIG. FIG.
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How many significant Figures…..?(Guided Practice)
1. 1.097800(What is the Rule?)
2. 4.690(What is the Rule?)
3. 0.00785(What is the Rule?)
4. 3000(What is the Rule?)
5. 3000.00(What is the Rule?)
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Independent Practice
Turn to Page 63.
Complete Problems 80 & 91.
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How would you explain….
Tell me how you would explain to someone you were tutoring the process it takes to convert using the metric system.
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Home work
Find an item that is measured in metric units of volume….grams.
Example – milk 236 mL
Example – Rice –a-Roni 192 g
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Thought for the Week:
Let no corrupt communication proceed out of your MOUTH!