Question

Practice Problems (show all work):

1. How many significant figures are there in the following numbers?
a. 0.008 = __________
b. 9023 = __________
c. 252.06 = __________
2. What is the volume of a salt crystal measuring 5.44 x 10-2m by 2.5 x10-3m by 7.9 x 10-3 m?
3. What is the quantity 750 milligrams expressed in grams?
4. What is the volume of 50.0 g of calcium if the density of calcium is .50 g/mL?
5. How did Lavoisier transform the field of chemistry in the late 1700s?

Please please please help thank you.

Answer 1

1a 1
b 4
c 5
2 (5.44x10^2)(2.5x10^-3)(7.9x10^-3) = 1.1x10^-6
3 750/1000 = 0.750
4 50/0.5 = 100 mL
5 He came up with the modern ideals for chemsitty