Chemistry Assg.

Chemistry Assignment

Module Two Assignment

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Elements

Instructions:

Using the periodic table, answer the following questions about elements.

1. What is the atomic number for Carbon?

2. What is the chemical symbol for Tungsten?

3. What is the atomic number for strontium?

4. What is the atomic number for mercury?

5. What element has the symbol Ag?

6. What element has the symbol Nb?

7. What is the atomic number for gallium?

Atoms and Ions

Instructions: Answer the following questions regarding ions losing and gaining electrons.

1. How many electrons does potassium need to lose to become an ion? Will it become a positively charged cation or a negatively charged anion?

2. How many electrons must nitrogen gain to become like its closest noble gas, Neon?

3. What are valence electrons?

Instructions: Answer the following questions about isotopes.

4. Given that the mass number for carbon is 13, how many protons and how many neutrons does the isotope contain?

5. Hydrogen has two naturally occurring isotopes: hydrogen-1 and hydrogen-2. What is the symbol for each of these hydrogen isotopes?

6. How many neutrons are contained in nitrogen-15?

7. How many protons does calcium-43 contain?

Atomic Mass
Instructions:

1. Find the atomic mass unit of Sulfur-32 with a mass of 31.972 and percent abundance 94.99%, Sulfur-33 with a mass of 32.971 and percent abundance 0.75%, Sulfur-34 with a mass of 33.968 and percent abundance 4.25%, and Sulfur-36 with a mass of 35.967 and percent abundance 0.01%.

2. Find the atomic mass unit of Silicon-28, Silicon-29, Silicon-30 with masses of 27.977, 28.976, 29.974, respectively. The percent abundance of the silicon isotopes is 92.2%, 4.7% and 3.1%, respectively.

Periodic Table and Its Trends

Instructions: Answer the following questions regarding the periodic table, the Bohr Model, and electron configuration.

1. Explain periodic table.

2. What is the Bohr Model? Provide a summary in your own words.

3. What is the electron configuration of calcium?

4. What is the electron configuration of oxygen?

5. How many valence electrons does magnesium (Mg) have?

Molecules and Compounds

Instructions: Find the mass ratios and atomic ratios of the following compounds.

1. PCI3

2. SbF5

3. BaCl2

4. BaI2

5. CCl4

6. OsO4

Instructions: Write the formula for each of the following ionic compounds.

7. Sodium chloride

8. Potassium chloride

9. Ammonium chloride

10. Sodium hydroxide

11. Calcium Nitrate

Instructions: Name the following ionic compounds.

12. MgCl2

13. CaCl2

14. CuSO4

15. Al2O3

Instructions: Name the following molecular compounds.

16. PCI3

17. PCI5

18. CCI4

19. NI3

Instructions: Write the formulas for the following molecular compounds.

20. Sulfur hexafluoride

21. Sulfur dioxide

22. Dinitrogen trioxide

23. Carbon tetrafluoride

Updated 10719

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