Presentation on theme: "Daily Review Tell the difference between accuracy and precision. Give an example. Record 56,489.23 in scientific notation. Record 0.0025050 in scientific."— Presentation transcript:
1 Daily ReviewTell the difference between accuracy and precision. Give an example.Record 56, in scientific notation.Record in scientific notation.What is the formula for percent error?
3 Learning Objectives You will need to be able to: Determine the number of significant figures in a number.Calculate using significant figuresRound using significant figures
4 Significant FiguresIn a measurement the last digit is considered to be an estimate (guess).Significant figures in a measurement include those numbers that are known plus one estimates digit.
5 Significant Figure Rules 1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS significant.EX: has 5 Sig. Figs.2) ALL zeroes between non-zero numbers are ALWAYS significant. “Captured Zeros”EX 1.02 has 3 Sig. Figs.3) ALL zeroes which are SIMULTANEOUSLY to the right of the decimal point AND at the end of the number are ALWAYS significant. “Place Holders”EX: has 2 Sig. Figs.EX: 100 has 1 Sig. Fig.4) ALL zeroes which are to the left of a written decimal point and are in a number >= 10 are ALWAYS significant. “Trailing Zeros”EX: has 4 Sig. Figs.
6 Practice: Sig. Figs.Determine the number of significant digits in each of the following:6.571 gb) kgc) 28.0 mld) 2500e) gAnswers45326
7 Ten-Two In your notebook: Take two minutes to summarize what you have learned to far!
8 Significant Figures: Rules for Calculation Rule #1:ADDITION AND SUBTRACTION:When adding or subtracting numbers, count the NUMBER OF DECIMAL PLACES to determine the number of significant figures. Record your answer using the FEWEST NUMBER of decimal places(6 places after the decimal)(4 places after the decimal)(2 places after the decimal)(on calculator)Answer: (rounded to 2 places in the answer)
9 Significant Figures: Rules for Calculation Rule #2 MULTIPLICATION AND DIVISION:When multiplying or dividing numbers, count the NUMBER OF SIGNIFICANT FIGURES. Record your answer using the SMALLEST number of significant figures(8 significant figures)x (5 significant figures(on calculator)Answer (rounded to 5 significant figures)
10 Practice: Sig. Figs.Using the rules for Significant figures calculate the following and record using the correct significant figures.3.15 x 2.5 x 4.0040.8 / 5.05Answers217.3328.08
12 Sigs. Figs Daily Review What are significant figures? Why are significant figures important?How many significant figures are in the number ? ?Calculate using the correct number of significant figures.2.3 x 1.23Sigs. Figs
13 Learning objectives You will need to be able to: Understand the SI base units and their abbreviationsUse prefixes and convert between metric unitsUnderstand measurement abbreviations.
14 Early MeasurementWhat do you find right or wrong with these forms of measurements?
17 Practice What is the unit of measurement for length? What is the unit of measurement for count or quantity of a substance?What is the base unit for temperature?What is the base unit for mass?MeterMoleKelvinKilogram
18 Practice Give the abbreviation for the following measurement units: centiliterMillimeterMegagrampicoseconddeciliterAnswerscLmmMgpsdL
19 How many jumps does it take? Ladder Method123KILO 1000 UnitsHECTO 100 UnitsDEKA 10 UnitsDECI 0.1 UnitMeters Liters GramsCENTI 0.01 UnitMILLI UnitHow do you use the “ladder” method?1st – Determine your starting point.2nd – Count the “jumps” to your ending point.3rd – Move the decimal the same number of jumps in the same direction.4 km = _________ mStarting PointEnding PointHow many jumps does it take?4.1__.2__.3__.= 4000 m
20 Practice: Metric conversions Convert these using the diagram1000 mg = _______ g1 L = _______ mL160 cm = _______ mm14 km = _______ m109 g = _______ kg250 m = _______ km
21 Thinking log On a post-it note: The hardest part of the lesson was_______________I was successful in ___________________