Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Scientific Notation (aka- Exponential Notation) • Chemists often make calculation using very large or very small numbers. Sci. Notation is used to compact the numbers. • A number in Scientific notation has two parts or factors. • 1st factor- a number between 1-9.99 • 2nd factor- an exponent of 10 (+ or -) Steps to enter Sci. Notation on Graphing Calculators 1. 2. 3. 4. Type in first factor Hit 2nd function key Hit “EE” key Type in exponent + - • Use the arrows to determine direction to move decimals and the number of places moved is equal to the exponent. • For Example• 0.0098 m would be 9.8 x 10-3 m • 1453000 g would be 1.453000 x 106 Significant Figures in Measurement • The significant figures of a measurement or a calculation consist of all the digits known with certainty as well as one estimated or uncertain, digit. The last digit or significant figure reported in a measurement is uncertain or estimated. Rules for Determining SigFigs 1. Non-zero digits are ALWAYS SIGNIFICANT. 2. Zeros between nonzero digits are SIGNIFICANT. 3. Final zeros to the right of the decimal are SIGNIFICANT. 4. Place-holding zeros are NOT SIGNIFICANT, this includes zeros in front of the decimal. Rules for Calculations w/ SigFigs 1. In Mult./Div. Problems, the answer can’t have more sigfigs than in the smallest measurement in the problem. 2. In Add./Subtr. Problems, the answer can’t have more decimal places than the least number of decimal places in the problem. 3. In problems that involve both operations, round after each operation. Practice Problems 1. How many sigfigs in456.0 m 2. How many sigfigs in500 g 3. Round the answer to the correct # of sigfigs- 45.67g/2.1 ml = 4. Round the answer to the corrct # of sigfigs- 3.14m + 4.5 m + 890m =