Practice Exercises:
1.
2.
3
4.
5.
6.
7.
8.
Indicate the number of significant figures in each of the following:
a. 14000.0
b. 30000
c. 0.0078
d. 22349087
e. 101010.0101
Round off the following numbers to the number of significant figures indicated in
the parenthesis.
a. 667,000 (4)
b. 0.0000032456 (3)
Convert
a. 7.23 km2 to m2
b. 3.4 gal to L
The temperature of a piece of metal immersed in boiling water was found to be
98.5 0 C. what is this temperature in 0 F?
One edge of a cube is measured and found to be 13 cm. What is the volume of the
cube in m3 ?
Lead has a density of 11.4g/cm3. What is the mass, in grams of a lead ball with a
radius of 0.50 mm?
A 200-g lead sinker at 110 0 C is placed in a cylinder with 500 g of cold water at 10 0
C. If the resulting temperature is 11.19 0 C, what is the specific heat of the metal?
A certain metal of unknown weight and a specific heat of 0.335 J/g0 C is heated to
83.00 C and is then placed in 200 g of water at 21.00 C. The final temperature of the
metal and water was 23.0 0 C. Assuming that no heat was lost to the surroundings,
how much does the metal weigh?