Upcoming SlideShare
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Standard text messaging rates apply

# Chem01

202

Published on

9/12/2009

9/12/2009

Published in: Education, Business, Technology
0 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
Your message goes here
• Be the first to comment

• Be the first to like this

Views
Total Views
202
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
0
0
Likes
0
Embeds 0
No embeds

No notes for slide

### Transcript

• 1. A B 1 2.7 4 2 2.8 4 3 3.1 4 4 2.9 4 5 3.3 4 6 2.8 4
• 2.  Why do we use significant digits? • Because any measurement involves errors
• 3.  What is the difference between 26kg and 26.0kg? Accuracy!  Finding significant digits  Rule 1: • Look for a decimal point. • e.g. 26kg. NO decimal point • e.g. 26.0kg.YES decimal point • e.g. 26.0000kg.YES
• 4.  Rule 1: Look for decimal point  Rule2: if there is no decimal point, the zeros at the end do not count. • 26kg • 260kg • 2600000000kg • (all have 2 significant digits)
• 5.  Rule 1: Look for decimal point  Rule2: if there is no decimal point, the zeros at the end do not count.  Rule3: if there is a decimal point, the zeros at the beginning do not count. • 0.003kg (1 significant digit) • 0.0030kg (2 significant digits) • 0.0030000kg (5 significant digits) • 1.0030kg (5 significant digits)
• 6.  .0026701 kg  2.6701 kg  2.67010 kg  2.670100 kg  10.0550 kg  3500 m  1,809,000 L
• 7.  3.052 m X 2.10 m X 0.75 m =  4.8069 m3  Which number has the least number of significant digits?  The answer has the same # of significant digits as the number with the smallest #.  4, 3, 2. Answer = 4.8069 m3 .  4.8 m3
• 8.  100 =1  101 =10  102 =100  10-1 =0.1  10-2 =0.01  17 = 1.7 x 101
• 9.  32,700 • 3.27 x 104  1,024,000 • 1.024 x 106  .0047100 • 4.71 x 10-3
• 10.  A. Find the number of significant digits in: • a) 400 b) 4000 c) 400.1 d) 400.10 • e) 0.001 f) 0.0010  B. Scientifically notate: • a) 0.0358 • b) 358,000