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Please read before you come for the next lesson

Additional Notes on significant figures

When we use an equipment to take measurement, it is important to be honest when reporting a measurement, so that it does not appear to be more accurate than the equipment used to make the measurement allows. To achieve this, we can control the number of significant figures used to report the measurement.

When we look at a number, its first significant figure is the first digit from the left, other than 0. E.g. -in the number 539 the first significant figure is 5
-in the number 0.06189 the first significant figure is 6

The number of significant figures is the number of digits counting from the left from the first significant figures.

By looking at the examples below, generate some rules in determining the number of significant figure of a number. * in the number 0.06189 there are four significant figures * in the number 2390001 there are seven significant figures * in the number 2390000 there are three (or seven) significant figures** * in the number 2390000.00 there are nine significant figures

The rules that I can generate are:

When using calculator to solve a problem, the answer shown on the calculator may consist of many digits. But not all the numbers that appear on the calculator are ‘significant’. You may just want to express your answers in, for example, three significant figures.

The examples below show how you should express your answer in 3 significant figures. Fill in the blanks. * 981.2645 should be written as 981
* 2.365789 should be written as 2.37
* 4321789.1 should be written as 4320000
* 7.1000000 should be written as __________
* 3629.3309 should be written as __________
* 0.0056793 should be written as __________

Self directed learning:
Take the quiz to test your understanding on significant figure:...

...SignificantFigures in Measurement and Calculations
A successful chemistry student habitually labels all numbers, because the unit is important. Also of great
importance is the number itself. Any number used in a calculation should contain only figures that are
considered reliable; otherwise, time and effort are wasted. Figures that are considered reliable are called
significantfigures . Chemical...

...SignificantFigure Rules
Significantfigure rules are really "rules of thumb" for how to handle the results of calculations so as
not to introduce or lose precision in performing a mathematical operation. These rules are not always
correct for all situations. However, in most cases, following the significantfigure rules will yield a
good result.
Rules concerning zero
A zero between two...

...glassware (beakers, burettes, pipettes, graduated cylinders, flasks, etc) should be used in various
circumstances.
2. Know how to “correctly” measure volume and mass (weight).
3. Become familiar with significantfigures and its relationship to measurements and data recording (significantfigures).
4. Become familiar with the errors, precision and accuracy associated the various measurement tools and techniques.
5. Determine the...

...be caught.
A. SIGNIFICANTFIGURES (10 pts.)
(Show the actual results first before rounding off the digits into their proper significantfigures.)
A.1. Determine the number of significantfigures in each numerical value below. (Assume all values are measurements.)
1. 357 ml
2. 1.0600 L
3. 0.000 501 g
4. 23, 000 tons
5. 1.8000 X 105 mi
A.2. Perform the following arithmetic...

...number of significantfigures indicated within brackets.
(a) 8.043 (2s.f.)
(b) 4.13865 (2s.f.)
(c) 0.04036 (1s.f)
(d) 0.03064 (3s.f)
(e) 64.074 (1s.f)
(f) 71.97 (3s.f)
(g) 2467 (2s.f)
10. Calculate the following and write correct to 1s.f
(a)
(b)
(c)(4.742+6.292)3
(d)
11. The diameter of the sun is 1 392 530
kilometres. Write this value correct to
4 significantfigures....

...example of physical change?
A. The rusting of an iron nail
B. The burning of propane in a gas grill
C. Baking cookies
D. Polishing tarnished silver
E. Melting of an ice cube in a glass of soda
3. Which measurement has the fewest number of significantfigures?
A. 12.80 m
B. 0.1280 m
C. 0.001280 m
D. 1280 m
4. Which quantity is an exact number?
A. 3 cars
B. 1,000 m
C. 2 L
D. 453.6 g
5. The number 0.0035880 expressed correctly using...

...public figures be the subject of media coverage?
Public figures are those who have got their positions through the choice of their people, people who have been elected to lead the country or who hold responsible positions in their societies. They are people like royalty, presidents, prime ministers, ministers and members of parliament. To this we could add judges, public prosecutors and other important civil servants. It is true that they are often the subject of...

...
Sports Figures and Celebrities: Who Is The Right Role Model?
Krista Nicole Valley
ENG 122: English Composition II
Prof: Heather Nielson
February 22, 2015
I. Introduction
A: Thesis Statement
While celebrities and sports figures are more likely to be role models to children, it is up to the child to decide whether to base their decision on likes and beliefs, or looks.
II. Body paragraph #1- Topic Sentence #1
When it comes...