Chem 11 Matter and Atomic Theory Assignment Name:

****************************Please answer all questions on looseleaf!**********************************

1. How many significant figures does each of the following have?

a. 0.000 234 432 ml b. 18 000 km

c. 65.5867000 m d. 260 000.0089 s

2. Complete the following calculations. Express the answer with the correct number of significant digits.

a. 600 009 x 9 += b. (9.54 + 1.4) x 46.3 =

c.  8.452 + 0.1234 + 0.777 + 122.11= d. 990 – 127.499 =

3. Convert the following:

a. 26.034 mJ = ______cJ b. 30.99 cL = ______μL

c. 0.099 cm = ______mm d.1024 dm = ______km

4. Classify the following as heterogeneous or homogeneous mixtures.
a. blood b. chocolate-chip ice cream c. brass d. milk e. cup of coffee

5. A clear liquid in an open container is allowed to evaporate. After three days a solid residue is left in the container. Was the original liquid an element, compound or mixture? Explain how you arrived at your answer.

6. Classify the following as an element, compound or mixture:
a. argon b. ethanol (C2H5OH) c. grape juice d. blue cheese e. zinc

7. Classify the following changes as physical or chemical:
a. food spoils b. water boils c. a nail rusts

d. bread bakes e. sugar dissolves in water f. a snowflake melts

8. List four physical properties of a drywall nail.

9. Describe how to distinguish between each of the following pairs.

a)  Heterogeneous and homogenous matter

b)  Solutions and pure substances

10. Classify the following statements as qualitative or quantitative.

a)  The candle flame was about 4 cm high.

b)  Carbon is a black at room temperature and pressure

c)  Coal is our primary source of carbon

11. Complete the following table

Element / Symbol / Number of
Protons / Number of
electrons / Number of
neutrons / Atomic
Number / Mass
Number
25 / 53
11 / 12
35 / 45
39 / 89
33 / 75
Ac / 227
nitrogen-15

12. Explain how you would separate a mixture of wood chips, sugar, and water so that you would have all three substances in the end.

13. Which of the following are isotopes?

(a) (b) (c) (d) (e) (f)

14. Use the following information to determine the atomic mass of chlorine. Two isotopes are known: chlorine-35 (mass = 35.0 amu) and chlorine-37 (mass = 37.0 amu). The relative abundance’s are 75.4% and 24. 6%, respectively.

15. Use the following information to determine the atomic mass of carbon. Two isotopes are known: carbon-12 (mass = 12.00 amu) and carbon-13 (mass = 13.00 amu). Their relative abundance’s are 98.9% and 1.10% respectively.

16. Given the relative abundance of the following naturally occurring isotopes of oxygen, calculate the average atomic mass of oxygen:

oxygen- 16: 99.76%

oxygen- 17: 0.037%

oxygen-18: 0.204%

17. Discuss the structure of an atom including the location of the proton, electron, and neutron with respect to the nucleus.

18. Write the nuclear symbols for three isotopes of sulfur in which there are 16, 17, and 18 neutrons respectively.