Charlie Online Assignment 1

Chapter 1b
1. Express the number 0.000938 in scientific notation.
c) 9.38 × 104
2. The number of significant figures in 8.6002 10-2 g is
c) 5.
3. How many significant figures are there in the value 0.001940 cm? Express in Scientific notation
d) 4 , 1.94 x 10-3
4. How many significant figures are there in the measured value 36.000? Express in Scientific notation
b) 5 , 3.6 x 10
5. How many significant figures are there in 0.095900 × 10–4 ? Express in Scientific notation
c) 5.
6. How many significant figures are there in the number 3.1400? Express in Scientific notation
e) 5 , 3.1400 x 10
.7. How many significant figures are there in the number 0.04560700? Express in Scientific notation
c) 7
.8. The answer that should be reported for the total mass of solution when 10.73 mg of benzene is added to 8.52 g of toluene is
a) 8.53073 g. 9. The radius of a circle is measured to be 7.31 cm. How should the circle's area be reported? (A = r2)
b) 167.874 cm2

Chapter 1a
15. All of the following are examples of mixtures except
c) distilled water.
16. All of the following are homogeneous mixtures except
d) hydrogen gas plus chlorine gas.
17. Which of the following is a homogeneous mixture?
e) a, b, and c
18. All of the following statements are correct except
d) The conversion of liquid water into gaseous water is a chemical change.
19. All the following are examples of chemical changes except
e) aging.
20. Which of the following is an example of a chemical change?
e) a sunburn
21. Which of the following is(are) a chemical transformation?
1. frying an egg
2. boiling an egg
3. poaching an egg
e) 1, 2, and 3
22. Which of the following is an example of a chemical change?
d) silver tarnishing
23. The boiling of water is a
b) physical