Calculator.ppt
- 1. Scientific Notation Really large, and really small numbers
- 2. Why? Chemistry often deals with very large and very small numbers. There are 602,000,000,000,000,000,000,000 molecules of water in 18 mL one electron has a mass of 0.000000000000000000000000000911 g We need a shorter way of writing these numbers
- 3. Standard Exponential Form another name for scientific notation. consists of two parts a number between 1 and 10 multiplied by 10, raised to some power 602,000,000,000,000,000,000,000 = 6.02 x 1023 0.000000000000000000000000000911 g = 9.11 x 10-28
- 4. Putting a number into scientific notation determine how many times you have to move the decimal place to make it into a number between 1 and 10 3240000 use that as the power of 10 3.24 x 106
- 5. What is the number is smaller? if you make the number bigger by moving the decimal point, make the exponent smaller and visa-versa 0.00045 4.5 x 10-4
- 6. Getting back to original number Move the decimal point the same number of times as the exponent If the exponent gets bigger the number gets smaller Change 2.99 x 108 Change 4.87 x 10-3
- 7. Using your calculator EE and EXP button stand for x 10 to the 4.5 x 10-4 push 4.5 push either EXP or EE push 4 +/- or -4 see what your display says.
- 8. Practice these problems (4.8 x 10 5 ) x (6.7 x 10-6) (6.8 x 10 -6) (3.2 x 10 4) Remember when you multiply you add exponents 106 x 10-4 When you divide you subtract exponents.
- 9. Adding and Subtracting You can’t add or subtract numbers until they are to the same power of ten. Your calculator does this automatically. (4.8 x 10 5 ) + (6.7 x 106) (6.8 x 10 -6) -(3.2 x 10-5) Remember- standard form starts with a number between 1 and 10 to start.
- 10. PEMDAS 3 3 4 2.4 10 4.8 10 1.2 10 3 4 3 4.8 10 1.2 10 2.4 10
- 11. PEMDAS 3 3 4 2.4 10 4.8 10 1.2 10 3 4 3 4.8 10 1.2 10 2.4 10