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This assignment covers a number of topics from the term that are likely to be part of the comprehensive final exam. None of these topics or concepts should be surprises to you. They are, in fact, fairly predictable. Although not all of the questions on this assignment are "gimmes" (not all are necessarily "easy" questions) they are all things that you have worked with many times and should be able to answer without too much difficulty. Some of the questions cover topics that were difficult for the class earlier in the term, but now are easy because of the additional problem-solving experience gained over the last few months. As you answer the questions, try to think about your thought processes and what you have to know and understand to answer each question. Try to think beyond the question to its implications and to other related questions.

If you have trouble with any of these questions, make sure that you review the topics in your notes and the textbook. Also make sure you practice additional similar problems. The point of the assignment is to jog your memory and to help you get up to speed for the final exam. Hopefully, this assignment will also give you a confidence boost while further sharpening your skills.

How many significant figures are there in each of the following measurements?

a) 0.0023 mL

b) 4502 mL

c) 202.70 mL

What is the result if you add together a, b and c in the previous question? Make sure you express your answer with the correct number of significant figures. Hint: Where is the uncertainty in each number and what does that tell you about the answer?

What is the density of a sample with a mass of 22.2 g and a volume of 8 mL? Make sure you express your answer with the correct number of significant figures. Remember, the rules for handling sig figs for multiplication and division are not the same as the approach for addition and subtraction. Rethink your answer to the previous question if necessary.

What neutral element has the following electron configuration?
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴

What would be the charge on the stable ion that forms for the element named in the previous question?

Group 1A elements are called alkali metals. What are elements in group 2A, and 7A called?

How many valence electrons are involved in the Lewis structure of the sulfate ion? Be careful–you have to take into account the charge on the ion.

Do you want to check your answer to the above question? Multiply your answer by 9.375. If the result is the number of possible points on the C101 final exam, you got it right! If the result you get is 262.5, you didn't properly account for the charge on the ion and you should review your logic.

The ratio of calcium ions to chloride ions in calcium chloride is 1:2. What is the ratio of beryllium ions to phosphate ions in beryllium phosphate?

Methane can be described as a tetrahedral molecule consisting of 4 H atoms covalently bonded to a central carbon atom. The molecule is tetrahedral in shape and is nonpolar due to symmetry (μ=0). There aren't any lone pairs on any of the atoms in methane. How would you describe PBr₃ and GaBr₃? Hint: Count up all valence electrons and draw the Lewis structures. Don't forget to consider any lone pairs. Both are covalently bonded molecules, but your descriptions for PBr₃ and GaBr₃ shouldn't be the same!

What is the formula weight of Na₂HPO₄? Express you answer in g/mol.

What is the mass in grams of 0.200 moles of Na₂HPO₄?

I suspect that you are very confident of your answers to the last two questions, but if you want to verify that you got them correct, multiply the mass by 193.8, then round your answer to 4 significant figures. The result should be the date of our final exam: May 5, 2004 (5/5/04).

What is the pH of an acid solution if the [H⁺] concentration is 0.0001M? What if the concentration was 0.0003M?

How many protons, neutrons and electrons are in an isotope of sulfur with a mass number of 35 and a charge of –2?

Write your own question that uses q = mCΔT. Remember that "C" is a constant (the specific heat for the material) and you must know (provide) 2 out of the other 3 variables. What is the answer to your question?

Write your own question that uses the ideal gas law equation, PV=nRT. Remember, R is a constant and you must know (provide) 3 out of the other 4 variables. What is the answer to your question?

If you struggled with any of these questions, make sure you also review related material–not just the version asked here. Try to think about ALL of the ways that the various concepts could be turned into questions.

Keep studying hard! The more you practice doing problems, the better you will do on the final exam.

In order to receive a satisfactory score for this assignment, you must answer all questions and provide explanations for your answers as requested.