Significant Figures. How do you know when to round a number?. There are rules to determine which numbers are significant. Rule #1. All non-zero numbers are significant 284 has ____ sig figs 123,456 has _____ sig figs. 3. 6. Rule #2. Zeroes between non-zero digits are significant
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Significant Figures
284 has ____ sig figs
123,456 has _____ sig figs
3
6
2008 has _____ sig figs
108 has _____ sig figs
50000000001 has ____ sig figs
4
3
11
90000 has 1 sig fig
900.00 has 5 sig figs
120000 has ____ sig figs
500.00 has ____ sig figs
2
5
20.0 mL
28.1 mL
73.1 mL
0.00000485 has ____ sig figs
0.052 has ____ sig figs
3
2
4
6
1
5
4
2.34 + + 10.998
Step 1: Determine least precise number
So the answer will have 1 digit beyond the decimal point
4.5
Step 2: Do the math
2.34 + 4.5 + 10.998=
17.838
Step 3: Round to the appropriate number of sig figs
17.838
17.8
If 5 or greater round up
2.7
51
22.1
23.1 x 18.79 =
Step 1: determine least precise number
So the answer will have 3 digits
Step 2: do the math
23.1 x 18.79 =
434.049
Step 3: Round to the appropriate number of sig figs
434.049
434
22.2 20
40.
125 130
First apply addition/subtraction rules and then apply multiplication/division
(4.32 +5.0) x 768 =
7142 7100
9.3
Mass of sample = 18.9 g
Volume of water = 30.0 mL
Volume of water and sample = 35.0 mL
Calculate the density of the sample using sig figs.
35.0 mL – 30.0 mL = 5.0 mL
D = m/v
D = 18.9 g / 5.0 mL =3.8 g/mL
Announcement: Measurement packet should be completed by the end of this week and will be collected