WU 8/31 Create the following data table in your notes. MeasurementValue Number of paperclips Length of pen/pencil Volume in beaker Volume in graduated.

Slides:

Advertisements

Similar presentations

 Sig figs consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated.  Say a nail is between 6.3cm.

Advertisements

Significant Figures.

IB Chem I Uncertainty in Measurement Significant Figures.

Aim: How can we perform mathematical calculations with significant digits? Do Now: State how many sig. figs. are in each of the following: x 10.

Chapter 1.5 Uncertainty in Measurement. Exact Numbers Values that are known exactly Numbers obtained from counting The number 1 in conversions Exactly.

Significant Figures.

Counting Significant Figures:

Working with Significant Figures. Exact Numbers Some numbers are exact, either because: We count them (there are 14 elephants) By definition (1 inch =

2.4 Significant Figures in Measurement

Uncertainty in Measurements and Significant Figures Group 4 Period 1.

What time is it? Someone might say “1:30” or “1:28” or “1:27:55” Each is appropriate for a different situation In science we describe a value as having.

SIG FIGS Section 2-3 Significant Figures Often, precision is limited by the tools available. Significant figures include all known digits plus one estimated.

Unit One Notes: Significant Figures

Significant Figures. What is a significant figure? There are 2 kinds of numbers: 1. Exact : Known with certainty. Example: the number of students in this.

Significant Figures What do you write?

Significant Figures and Scientific Notation Significant Figures:Digits that are the result of careful measurement. 1.All non-zero digits are considered.

SIGNIFICANT FIGURES Measured Data Counted & Defined Data (exact numbers) Calculated Data –Multiplication & Division –Addition & Subtraction.

Rules For Significant Figures. 1. You can estimate one significant figure past the smallest division on an analog measuring device.

Significant Figures Rules and Applications. Rules for Determining Significant Figures 1.) All Non-Zero digits are Significant. 1.) All Non-Zero digits.

Significant Figures How to count the number of significant figures in a decimal number. How to count the number of significant figures in a decimal number.

Math vs. Science mathematicianto a mathematician: 73 = 73.0 = = etc scientistto a scientist, these numbers have a more complicated meaning.

Significant Figures. The Basics  All nonzero digits are significant  Ex: 1.2 – 2 significant digits  Ex: has 5 significant digits  Zeroes between.

Significant Figures and Scientific Notation The measuring device determines the number of significant figures a measurement has. Significant figures reflect.

Significant Figures 1.All non-zero digits are significant (2.45 has 3 SF) 2.Zeros between (sandwiched)nonzero digits are significant (303 has 3 SF)

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.

Significant figures The number of digits which describe a measurement.

Accuracy, Precision, Significant Figures

Significant Digits Unit 1 – pp 56 – 59 of your book Mrs. Callender.

Significant Figures Used to report all precisely known numbers + one estimated digit.

Introduction to Significant Figures & Scientific Notation.

Significant Figures. Significant Digits or Significant Figures We must be aware of the accuracy limits of each piece of lab equipment that we use and.

Significant Figures.

Significant Figures All the digits that can be known precisely in a measurement, plus a last estimated digit.

 1. Nonzero integers. Nonzero integers always count as significant figures. For example, the number 1457 has four nonzero integers, all of which count.

Unit 0: Working as a Scientist – Significant Figures AGENDA: DO NOW NOTES WHITE BOARDING LAB GOAL: I can properly record and calculate data with proper.

Why Is there Uncertainty? Measurements are performed with instruments, and no instrument can read to an infinite number of decimal places Which of the.

Section 5.2 Uncertainty in Measurement and Significant Figures 1.To learn how uncertainty in a measurement arises 2.To learn to indicate a measurement’s.

1-2 Significant Figures: Rules and Calculations (Section 2.5, p )

SIG FIGURE’S RULE SUMMARY COUNTING #’S and Conversion factors – INFINITE NONZERO DIGIT’S: ALWAYS ZERO’S: LEADING : NEVER CAPTIVE: ALWAYS TRAILING :SOMETIMES.

Significant Figures When we take measurements or make calculations, we do so with a certain precision. This precision is determined by the instrument we.

Significant Digits Uncertainty of Measurement. Three Rules Non-zero digits are significant Zeros between two significant digits are significant Zeros.

Significant Figures. Who cares? Sig Figs measure the degree of precision of a measurement.

Chemistry Using and Expressing Measurements Section 3.1.

Significant Figures!.

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

Unit 3 lec 2: Significant Figures

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

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

Review of yesterday… How many sig figs are in the following? 0.02

Significant Figures in Calculations

SIG FIGURE’S RULE SUMMARY

(sig figs if you’re cool)

IV. Significant figures

Notes Significant Figures!.

Text Section 2.3 Pages

Rules for Significant Digits

SIGNIFICANT figures.

Significant Figures Definition: The digits in a measurement that have values that are known exactly PLUS one digit that has a value that is estimated.

Significant figures RULES TO MEMORIZE!.

Unit 1 lec 3: Significant Figures

Exact and Inexact Numbers

Lesson 2 – Sci. Notation, Accuracy, and Significant Figures

Significant Measurements

PREREQUISITES!!! Lecture Homework: Reading - Chapter 2, sections 5-8

Significant Figures in Calculations

Accuracy and Precision

Accuracy and Precision

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.

Significant Figures (Sig figs)

Presentation transcript:

WU 8/31 Create the following data table in your notes. MeasurementValue Number of paperclips Length of pen/pencil Volume in beaker Volume in graduated cylinder Temperature of water

WU 9/1 **Take Out HW** 1.Read page #1 of the Syllabus 2.What category of this class has the most effect on your grade? 3.When you walk into the room each day, what is expected of you? 4.As simply as possible, state the tardy policy for this class. 5.What is the policy on late work? 6.What is the URL for the class website?

WU 9/2 Adjust your data table from yesterday. MeasurementValueNew Value# Sig. Figs Number of paperclips Length of pen/pencil Volume in beaker Volume in graduated cylinder Temperature of water

In your notes… Write what you think the word significant means.

3-1 Significant Figures Measurements have some uncertainty. When taking a measurement, significant figures are : – all the digits that are known, – plus one digit of uncertainty, or a guess.

Rules for significant figures: 1. EX: has ____ significant figures – Every nonzero digit in a reported measurement is assumed to be significant. – 5.62 has _____ significant figures. 2. EX: has ____ significant figures Zeros between nonzero digits are significant. EX: has ___ significant figures.

Rules 3 and 4 3. EX: has _____ sig. figs. – Leftmost zeros in front of nonzero numbers are not significant. – EX: EX: has _____ sig. figs. Zeros at the end of a number to the right of a decimal place are significant. EX:

Rule 5 EX: has _____ significant figures. – Zeros at the end of a measurement, to the left of a decimal place are not significant. – If a decimal place is included after the zeros, count the zeros as significant. – EX: has _____ significant figures.

Rule 6 EX: There are 34 students in this class Given values, or exact quantities have infinite significant figures

Practice How many sig figs are in the following numbers?

How many significant figures are in the following measurements? a g b s c m d kg e.5 apples f cm a. 5 b. 3 c. 3 d. 5 e. Infinite f. 4

Significant Figures & Math In General: calculated measurements are only as good as their weakest link (fewest sig figs) Addition & Subtraction – round answer according to fewest decimal places. (Don’t count digits to the left of the decimal place) Multiplication & Division – Round answer according to fewest significant figures in measurements (Count ALL digits) **These rules are on p. R60 as well