CH. 2 - MEASUREMENT. III. Using Measurements (p. 44 - 57). A. Accuracy vs. Precision. Accuracy - how close a measurement is to the accepted value Precision - how close a series of measurements are to each other. ACCURATE = CORRECT PRECISE = CONSISTENT. Let’s use a golf analogy.

ByMeasurement. Scientific measurement. Number vs. Quantity. Quantity - number + unit. UNITS MATTER!!. Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem. Types of measurement. Quantitative - use numbers to describe Qualitative - use description without numbers 4 feet

ByPlease Put Away. Electronic Devices. In the Classroom. Unit 3-4: Observation, Measurement and Calculations. Cartoon courtesy of NearingZero.net. Scientific Notation. In science, we deal with some very LARGE numbers:. 1 mole = 602000000000000000000000.

ByMeasurement and Significant Figures. www.lab-initio.com. Steps in the Scientific Method. 1. Pose problem; Make Observations - quantitative (numerical) Ex: length, height, mass. Benefits: non-biased - qualitative (descriptive) Ex: color, smell, taste. Drawback: biased (opinion)

ByMeasurements and Calculations. Rules for Counting Significant Figures - Details. Nonzero integers always count as significant figures. 3456 has 4 sig figs. Rules for Counting Significant Figures - Details. Zeros - Leading zeros do not count as significant figures . 0.0486 has

ByUnit 2: Significant Figures, Scientific Notation and Dimensional Analysis. Cartoon courtesy of NearingZero.net. Nature of Measurement. Measurement - quantitative (based on numbers) -made up of 2 parts. - number - unit You must ALWAYS include the unit!!!

BySignificant Figures -. = represent the valid digits of a number and tells us how good your instrument is. A. Rules for Significant Figures :. Rule #1 : Numbers other than zero are always significant. 2 sig figs. 96 g. 3 sig figs. 61.4g. 0.52 g. 2 sig figs.

BySignificant Figures. Cartoon courtesy of Lab-initio.com. Adapted from http://www.sciencegeek.net/Chemistry/Powerpoints2.shtml. Rules for Counting Significant Figures - Details. Zeros - Leading zeros do not count as significant figures . 0.0486 has 3 significant figures.

BySignificant Figures. 6. 7. 5. Significant Figures. Significant Figures refers to two things: 1) How many digits you should record when taking a measurement 2) How many digits should appear in your answer after you perform a calculation. 1. Taking Measurements.

BySignificant Figures. There are two kinds of numbers in the world: Exact There are exactly 12 eggs in a dozen Most people have exactly 10 fingers and 10 toes Inexact Any measurement. If I quickly measure the width of a piece of notebook paper, I might get 220 mm 2 significant figures

ByTrash- ket -ba ll Get ready to show some skill!. Unit 1 Review September. TEAMS-B DAY. THE REALS. THE RATIONALS. Darrius Alon Jorge F Vanessa Sarah. Jordan Obianuju Kaleel Mary Kalen. THE SIG FIGS. THE ABSOLUTES. Stephanie Patrick Rogelio Sa’jiah Shalia. Tiffany

ByMeasurement and Significant Figures. www.lab-initio.com. Steps in the Scientific Method. 1. Observations - quantitative - qualitative 2. Formulating hypotheses - possible explanation for the observation 3. Performing experiments - gathering new information to decide

ByScience method. organized way of solving problems the steps are...( not always in this order). problem- /observation. experiment - you may have to try this over and over). collect information- reading, data collection, research. Conclusion! you were right ( or wrong).

ByChapter 3. Scientific Measurement. Qualitative Gives results in a description, nonumerical form. Quantitative Give results in a definite form, usually numbers and units. Measurements. Accuracy vs. Precision. Accuracy - how close a measurement is to the accepted value

By70. 67. To the nearest 10. 60. 70. 120. 123. To the nearest 10. 120. 130. 1000. 1090. To the nearest 1000. 1000. 2000. 5. 4.7. To the nearest whole number. 4. 5. 1. 1.03. To the nearest whole number. 1. 2. 4. 3.6. To the nearest whole number. 3. 4. 1.2. 1.24.

ByUnit 0: Observation, Measurement and Calculations. Cartoon courtesy of NearingZero.net. Steps in the Scientific Method. 1. Observations - quantitative - qualitative 2. Formulating hypotheses - possible explanation for the observation 3. Performing experiments

ByUnit 2: Basic Math for Chemistry Lesson 1: Significant Figures. Do Now: Express 44,300 in scientific notation. Book Section: 3.1. Accuracy vs. Precision. Accuracy is how close a measurement is to the “correct” value. Precision is how close measurements are to each other.

ByNOTES: 3.1, part 2 - Significant Figures. Significant Figures:. The “sig figs” in a measurement include all of the digits that are known , plus a last digit that is estimated The # of sig figs in a measurement depends on the precision of the instrument being used

ByCalibration vs. Precision. If a balance is accurate, it should read 0 when nothing is on it. The process for making sure a balance or any equipment is accurate is called CALIBRATION. Clocks can measure to the minute, second or fraction of a second. This refers to an instrument’s PRECISION.

BySignificant Figures. Physical Science. What is a significant figure?. There are 2 kinds of numbers: Exact : the amount of money in your account. Known with certainty. Approximate : weight, height—anything MEASURED . No measurement is perfect.

ByView 2 sig figs PowerPoint (PPT) presentations online in SlideServe. SlideServe has a very huge collection of 2 sig figs PowerPoint presentations. You can view or download 2 sig figs presentations for your school assignment or business presentation. Browse for the presentations on every topic that you want.