1. Warm Up Which substance is best classified as being malleable?
lead plate
chocolate chip cookie
ceramic tile
glass panel

2. Chp 2 Activity 5 Investigation page 134
WDYT?
Since a kilogram of feathers and a kilogram of lead have the same mass, how do they appear different and why?

3. Investigation Volume and Mass of Water
You Have 20 minutes to complete Part A:
Copy the following data table into Log Book
Volume and Mass of Water
Mass of Graduated Cylinder
Volume of water (mL)
Mass of graduated cylinder and water (g)
Mass of water (g)
Mass
Volume
(g/mL) 1. 2. 3. 4. 5.

4. Independent Work
Checking Up
Page 140
Questions

5. Chemistry In Activity Chem Saver Pages 7
Precision vs. Accuracy
Accuracy refers to how close a measured value agrees with the correct value.
Precision refers to how closely individual measurements agree with each other. A precise measurement is one that we can make to a large number of decimal places.

6. Chemistry In Activity Chem Saver Pages 7
Graduated Cylinder
Burette
Beaker

7. 1045.010 7 Significant Figures The decimal point is present!
Go to the Pacific Ocean and start walking across the United States until you hit a nonzero digit. After you hit the first nonzero digit, count all digits after that. These are all significant.

8. 0.00560 3 Significant Figures The decimal point is present!
Go to the Pacific Ocean and start walking across the United States until you hit a nonzero digit. After you hit the first nonzero digit, count all digits after that. These are all significant.

9. 1045000 4 Significant Figures The decimal point is absent!
Go to the Atlantic Ocean and start walking across the United States until you hit a nonzero digit. After you hit the first nonzero digit, count all digits after that. These are all significant.

10. Chemistry In Activity Chem Saver Pages 8
Significant Digits
If Decimal absent Start from the Atlantic go to the first whole number count it and every number to the left.
35360 = ______
If decimal Present Start from the Pacific go to the first whole number count it and every number to the right.
= ______ 4 3

11. Practice Counting Significant Figures
Measurement m
17.10 Kg
100,890 L
3.29x103 seconds cm
3,200,000 ml
Significant Figures 5 4 3 2

12. 3.013 rounded to the hundredths is
3.02
3.045 rounded to hundredths is
3.05

13. Practice Rounding to 3 Significant Figures
762  
10.44 
10789   
14.3
10.4
10800
8020
204

14. MULTIPLYING and DIVIDING using Significant Figures
Chemistry In Activity Chem Saver Pages 8
MULTIPLYING and DIVIDING using Significant Figures
Example:
x 3.10 x = 4 3 4
So your answer can only have ________ Significant digits
3.10 3
________ Has the least number of significant Digits
5950
= ________

15. Chemistry In Activity Chem Saver Pages 8
ADDING and SUBTRACTING using Significant Figures
Example: =
So must be rounded to _____ decimal place 1 2 1 2
2.1
20.7
________ Has the least number of decimal places
20.69 = _________

16. Independent Work
Accuracy & Precision Worksheet