# cm15 - gets smaller ◆ Change 2.99 x 10 8 ◆ Change 4.87...

This preview shows pages 1–11. Sign up to view the full content.

Scientific Notation Really large, and really small numbers

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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 10 23 0.000000000000000000000000000911 g = 9.11 x 10 -28

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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 10 6
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Getting back to original number Move the decimal point the same number of times as the exponent If the exponent gets bigger the number

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: gets smaller ◆ Change 2.99 x 10 8 ◆ Change 4.87 x 10-3 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. 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 ◆ 10 6 x 10-4 ◆ When you divide you subtract exponents. 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 10 6 ) ◆ (6.8 x 10 -6 ) -(3.2 x 10-5 ) ◆ Remember- standard form starts with a number between 1 and 10 to start. PEMDAS ( 29 ( 29 ( 29 3 3 4 2.4 10 4.8 10 1.2 10-× × = × ( 29 ( 29 ( 29 3 4 3 4.8 10 1.2 10 2.4 10-× = × × PEMDAS ( 29 ( 29 ( 29 3 3 4 2.4 10 4.8 10 1.2 10-× × = × ( 29 ( 29 ( 29 3 4 3 4.8 10 1.2 10 2.4 10-× = × ×...
View Full Document

## This document was uploaded on 02/06/2011.

### Page1 / 11

cm15 - gets smaller ◆ Change 2.99 x 10 8 ◆ Change 4.87...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online