Download Chemistry Practice Exam I - Chapters 1-3 - Prof. Zelda Ziegler and more Exams Chemistry in PDF only on Docsity!
CH 221 Chapters 1- Practice EXAM I (chapters 1, 2,3)
Part I. Multiple Choice. Choose the single best response to each question, and put the letter identifying that response in the blank numbered the same as the question. If you choose a "none of these" response for a question with a numerical answer, you must write your answer in the answer blank. Five (5) points each, fifty (50) points total.
- A substance with the formula K 2 PtCl 6 is an example of a(n) A. element B. compound C. mixture D. solution E. none of these
1)_____________
- The symbol A is used to represent the element A. argon B. astatine C. actinium D. aluminum E. none of these
2)_____________
- The mass of a sample is 0.001580 g. The number of significant figures in this measurement is A. 1 B. 3 C. 6 D. 7 E. none of these
3)_____________
- Some units of pressure and their relations are
1 atm = 1.01325 x 10^5 Pa = 760 torr If a gas cylinder has a pressure of 542 atm, it could be recorded as A. 0.713 torr B. 4.12 x 10^5 torr C. 5.49 x 10-7^ Pa D. 5.35 x 10-3^ Pa E. none of these
4)_____________
- An ion of potassium, K, has
A. 15 electrons B. 18 electrons C. 19 electrons D. 20 electrons E. none of these
5)_____________
- Predict the formula of the ionic compound formed by calcium and oxygen. A. CaO B. CaO 2 C. Ca 2 O D. Ca 2 O 2 E. none of these
6)_____________
- Which of the following lists contains only metals? A. Na, Mg, Al, Si B. B, Al, Ga, In C. Zn, Ga, Ge, As D. Zn, Cd, Hg, Dy E. All contain at least one nonmetal
7)_____________
- Given a formula, write the name, and vice-versa. (12 points)
iron(III) oxide_____________________ nitrogen trifluoride _____________________ nitric acid _____________________ NaHCO 3 ______________________ SnS_______________________ P 2 O 5 ________________________
- If 7.35 g of chromium (Cr) reacted directly with oxygen to form 10.74 g of chromium oxide, what is the simplest formula of the oxide? (12 points)
- Consider the reaction
2 H 2 + O 2 → 2 H O 2
Suppose 4.20 g H 2 react with 24.0 g O 2.
a) What is the limiting reagent (reactant)? (8 points)
b) What mass of H 2 O will be produced? (6 points)
