Mrs. Whitaker Unit One, Day One 26 August 2013

Slides:

Advertisements

Similar presentations

The volume we read from the beaker has a reading error of +/- 1 mL.

Advertisements

Significant Figures. Purpose Significant figures are used with any measurement Significant figures are used with any measurement They tell you something.

1.07 Accuracy and Precision

TOPIC: Significant Figures Do Now: Round 9, to the… 1.Tenths 2.Ones 3.Hundreds 4.Thousandths 5.Thousands.

Starter 1.How would you record the following measurements? How many sig figs? a.b. 2.Count the sig figs in the following measured values: a

WARM UP Agenda Quiz Unit 1 Notes Unit 1-4 WS Unit 1 Density Work on online HW Homework Aug 28 – Online HW unit 1 Aug 31 - Test review WS Sept 2.

Precision and accuracy in measurements Shows accuracy, but not precision Shows precision but not accuracy.

Math vs. Science mathematicianTo a mathematician: 73 = 73.0 = = etc. scientistTo a scientist, these numbers mean very different things.

Chemistry 100 Significant Figures. Rules for Significant Figures  Zeros used to locate decimal points are NOT significant. e.g., 0.5 kg = 5. X 10 2 g.

Drill – 9/14/09 How many significant figures: Now complete the back of the measurement worksheet from last week (the graduated.

Scientific Notation & Significant Figures in Measurement.

Significant Figures. What are Sig Figs? Significant Figures are the digits in a measurement that are either knowns or estimates cm = 5 sig figs.

Significant Figures Homework: Working with Numbers handout # 1 – 13 Significant Figures handout #

International System of Units: SI System Universally accepted way to make measurements. Based off of the number 10 Conversions can be done easily.

SI (International/Metric System) of Units Universally accepted way to measure things Based off of the number 10 Conversions can be done easily.

Significant Figures Revisited Let’s take a look at some instruments used to measure --Remember: the instrument limits how good your measurement is!!

Significant Figures SIGNIFICANT FIGURES You weigh something and the dial falls between 2.4 lb and 2.5 lb, so you estimate it to be 2.46 lb. The first.

 Find your name on the sheet at the front of the class. Sit by the number corresponding to your name.  Start filling out the information sheet that you.

Making Measurements. SI system HW 1. A) g b) m. mm c) m 3 d) K e) m/s 2. A) 2g/cm 3 b) 25 kgm/s 2 (N) c. 13 m/s 2 3. A) mg b) 4.5 cm c) s.

Measurements and Mathematics in Chemistry

Unit: Introduction to Chemistry

Rules for Significant Figures

Significant Figures!.

Chapter 1 Significant Figures.

How big is the beetle? Measure between the head and the tail!

Unit 3 lec 2: Significant Figures

Accuracy and Precision Measurements Significant Figures (Sig Figs)

Significant Figures Notes on PAGE _____. Significant Figures Notes on PAGE _____.

Uncertainty and Significant Figures

How big is the beetle? Measure between the head and the tail!

Learning Targets I can use correct numbers of significant figures and units in both measurements and calculations. I can accurately measure mass and volume.

Significant Figures Definition: Measurement with Sig Figs:

Significant Figures.

Ch. 2 Math Review.

Warm –up #2 What is chemistry? Write what you recall about the definition and name 2 areas of study of chemistry.

Significant figures.

Aim: Why are Significant Figures Important?

Significant Figures.

OPENING ROUTINE A material will float on the surface of a liquid if the material has a density less than that of the liquid. Given that the density of.

How many Sig Figs? Start counting sig figs at the first non-zero.

Significant Figures.

(sig figs if you’re cool)

IV. Significant figures

GHS Enriched Chemistry Chapter 2, Section 3

Do Now & Announcements Take out HW to be checked

Significant Figures

Precision of Measurements

Significant Figures Any digit in a measurement that is known with certainty plus one final digit, which is somewhat uncertain or estimated.

Significant Figures The numbers that count.

Do Now Work on Unit Conversions Warm-Up

Significant Figures and Scientific Notation

Unit 1 lec 3: Significant Figures

Significant Digits.

Scientific Measurement.

Review of Essential Skills:

Significant Figures Be able to identify the number of significant figures that an number has.

Scientific Notation and Significant Figures

Section 2.3 Uncertainty in Data

Measurements Created by Educational Technology Network

5. Significant Figures- = represent the valid digits of a measurement and tells us how good your instrument is.

Chem Separation Challenge Write-Up due Mon 9/10 Unit 1 Test FRI 9/14.

Uncertainty and Significant Figures

Uncertainty and Significant Figures

How do you determine where to round off your answers?

Which of these numbers has the most significant figures E 5

Significant Figures and Rounding

Aim: How do we determine the number of significant figures in a measurement? Warm Up What is the difference between the values of 3, 3.0, and 3.00.

Presentation transcript:

Mrs. Whitaker Unit One, Day One 26 August 2013 Chemistry!!! Mrs. Whitaker Unit One, Day One 26 August 2013

Around the Room Eye-Wash Stations Safety Shower Student Center If you’re absent Objective and Agenda What to do when you’re done…

Remind 101 Awesome technology where I can send you texts/emails with updates All of our information stays private If you want to join: Text @chemfirst, @chemsecond, or @chemthird to 240-312-3733 Email chemfirst@remind101.com (leave subject and body blank)

Making Measurements In order to have the most precise answer possible, record as much as you definitely know and then estimate one more digit. - What does this mean??

Measuring Length What are some units of length??

Measuring Length

Measuring Length

Measuring Length

Measuring Volume This is a graduated cylinder Always measure from the bottom of the meniscus. Remember to add an estimated digit.

Measuring Volume

Measuring Volume

Measuring Mass This is a triple beam balance. Mass is measured in grams. Remember to add an estimated digit!!

Significant Figures All of the digits that can be measured, plus one that is estimated. Consider the measurement 3.01 g --the instrument used to measure was marked to the tenth of a gram (0.1 g) and the digit in the hundredths place was estimated

How were these instruments marked? 30,075 mL 17.0052 g Marked to the ones place Marked to the tens place Marked to the thousandths place

How many significant figures? 30,075 mL 17.0052 g 3 (2 measured + 1 estimated) 5 ( 4 measured + 1 estimated) 6 (5 measured + 1 estimated)

How many significant figures? 200 One – zeros have funky rules

Rules to determine # of Sig Digs There are three rules on determining how many significant figures are in a number: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros AFTER THE DECIMAL POINT ONLY are significant.

How many significant figures? 3 4 2

How many significant figures? 60.50 cm 0.00015 kg 135.000 m 400 000 001 mL 4 2 6 9

Individual Practice Now, work on the first part of the worksheet, on your own. We haven’t discussed operations yet, so be sure not to work ahead…

Multiplication and Division The answer must be reported with the lowest number of significant figures that are in the problem.

Practice 25g / 5cm3 5 g/cm3 0.002cm x 15.2 cm 0.03 cm2 350g / 2.0 cm3 180

Addition and Subtraction The number of decimal places matters!! Your answer has to be rounded to the lowest number of decimal places.

Some Practice 35 + 454 + 0.3 = 355 – 23.4 = 17.0 – 2.1 =