Sig_figs_and_Sci_Not_Notes.ppttyhhhhhhhhh
- 1. Introduction to Significant Figures & Scientific Notation
- 2. Significant Figures • Scientist use significant figures to determine how precise a measurement is • Significant digits in a measurement include all of the known digits plus one estimated digit
- 3. For example… • Look at the ruler below • Each line is 0.1cm • You can read that the arrow is on 13.3 cm • However, using significant figures, you must estimate the next digit • That would give you 13.30 cm
- 4. Let’s try this one • Look at the ruler below • What can you read before you estimate? • 12.8 cm • Now estimate the next digit… • 12.85 cm
- 5. The same rules apply with all instruments • The same rules apply • Read to the last digit that you know • Estimate the final digit
- 6. Let’s try graduated cylinders • Look at the graduated cylinder below • What can you read with confidence? • 56 ml • Now estimate the last digit • 56.0 ml
- 7. One more graduated cylinder • Look at the cylinder below… • What is the measurement? • 53.5 ml
- 8. Rules for Significant figures Rule #1 • All non zero digits are ALWAYS significant • How many significant digits are in the following numbers? •274 274 •25.632 25.632 •8.987 8.987 •3 Significant Figures 3 Significant Figures •5 Significant Digits 5 Significant Digits •4 Significant Figures 4 Significant Figures
- 9. Rule #2 • All zeros between significant digits are ALWAYS significant • How many significant digits are in the following numbers? 504 60002 9.077 3 Significant Figures 5 Significant Digits 4 Significant Figures
- 10. Rule #3 • All FINAL zeros to the right of the decimal ARE significant • How many significant digits are in the following numbers? 32.0 19.000 105.0020 3 Significant Figures 5 Significant Digits 7 Significant Figures
- 11. Rule #4 • All zeros that act as place holders are NOT significant • Another way to say this is: zeros are only significant if they are between significant digits OR are the very final thing at the end of a decimal
- 12. For example 0.0002 6.02 x 1023 100.000 150000 800 1 Significant Digit 3 Significant Digits 6 Significant Digits 2 Significant Digits 1 Significant Digit How many significant digits are in the following numbers?
- 13. Rule #5 • All counting numbers and constants have an infinite number of significant digits • For example: 1 hour = 60 minutes 12 inches = 1 foot 24 hours = 1 day
- 14. How many significant digits are in the following numbers? 0.0073 100.020 2500 7.90 x 10-3 670.0 0.00001 18.84 2 Significant Digits 6 Significant Digits 2 Significant Digits 3 Significant Digits 4 Significant Digits 1 Significant Digit 4 Significant Digits
- 15. Rules Rounding Significant Digits Rule #1 • If the digit to the immediate right of the last significant digit is less that 5, do not round up the last significant digit. • For example, let’s say you have the number 43.82 and you want 3 significant digits • The last number that you want is the 8 – 43.82 • The number to the right of the 8 is a 2 • Therefore, you would not round up & the number would be 43.8
- 16. Rounding Rule #2 • If the digit to the immediate right of the last significant digit is greater that a 5, you round up the last significant figure • Let’s say you have the number 234.87 and you want 4 significant digits • 234.87 – The last number you want is the 8 and the number to the right is a 7 • Therefore, you would round up & get 234.9
- 17. Rounding Rule #3 • If the number to the immediate right of the last significant is a 5, and that 5 is followed by a non zero digit, round up • 78.657 (you want 3 significant digits) • The number you want is the 6 • The 6 is followed by a 5 and the 5 is followed by a non zero number • Therefore, you round up • 78.7
- 18. Rounding Rule #4 • If the number to the immediate right of the last significant is a 5, and that 5 is followed by a zero, you look at the last significant digit and make it even. • 2.5350 (want 3 significant digits) • The number to the right of the digit you want is a 5 followed by a 0 • Therefore you want the final digit to be even • 2.54
- 19. Say you have this number • 2.5250 (want 3 significant digits) • The number to the right of the digit you want is a 5 followed by a 0 • Therefore you want the final digit to be even and it already is • 2.52
- 20. Let’s try these examples… 200.99 (want 3 SF) 18.22 (want 2 SF) 135.50 (want 3 SF) 0.00299 (want 1 SF) 98.59 (want 2 SF) 201 18 136 0.003 99
- 21. Scientific Notation • Scientific notation is used to express very large or very small numbers • I consists of a number between 1 & 10 followed by x 10 to an exponent • The exponent can be determined by the number of decimal places you have to move to get only 1 number in front of the decimal
- 22. Large Numbers • If the number you start with is greater than 1, the exponent will be positive • Write the number 39923 in scientific notation • First move the decimal until 1 number is in front – 3.9923 • Now at x 10 – 3.9923 x 10 • Now count the number of decimal places that you moved (4) • Since the number you started with was greater than 1, the exponent will be positive • 3.9923 x 10 4
- 23. Small Numbers • If the number you start with is less than 1, the exponent will be negative • Write the number 0.0052 in scientific notation • First move the decimal until 1 number is in front – 5.2 • Now at x 10 – 5.2 x 10 • Now count the number of decimal places that you moved (3) • Since the number you started with was less than 1, the exponent will be negative • 5.2 x 10 -3
- 24. Scientific Notation Examples 99.343 4000.1 0.000375 0.0234 94577.1 9.9343 x 101 4.0001 x 103 3.75 x 10-4 2.34 x 10-2 9.45771 x 104 Place the following numbers in scientific notation:
- 25. Going from Scientific Notation to Ordinary Notation • You start with the number and move the decimal the same number of spaces as the exponent. • If the exponent is positive, the number will be greater than 1 • If the exponent is negative, the number will be less than 1
- 26. Going to Ordinary Notation Examples 3 x 106 6.26x 109 5 x 10-4 8.45 x 10-7 2.25 x 103 3000000 6260000000 0.0005 0.000000845 2250 Place the following numbers in ordinary notation: