Download Summer Assignment 2015

AP Chemistry Summer Assignment 2015
Name ________________________________
Complete this assignment on a separate sheet(s) of paper. To receive full credit you must show
all work, report your answers to the proper number of significant figures, and your answers
must have the appropriate units. Refer to the links on the last page for help.
Feel free to e-mail me with any questions. [email protected]
1. How many significant figures are in each of the following measurements:
(a) 3.549 g, (b) 2.3  104 cm, (c) 0.00134 m3?
2. A gas at 25 °C fills a container whose volume is 1.05  103 cm3. The container plus gas
have a mass of 837.6 g. The container, when emptied of all gas, has a mass of 836.2 g.
What is the density of the gas at 25 °C?
3. How many protons, neutrons, and electrons are in (a) an atom of 197Au; (b) an atom of
strontium-90?
4. How many protons, neutrons, and electrons are in (a) a 138Ba atom, (b) an atom of
phosphorus-31?
5. Give the complete chemical symbol for the atom that contains 82 protons, 82 electrons,
and 126 neutrons.
6. Naturally occurring chlorine is 75.78% 35Cl, which has an atomic mass of 34.969 amu,
and 24.22% 37Cl, which has an atomic mass of 36.966 amu. Calculate the average atomic
mass (that is, the atomic weight) of chlorine.
7. Write the empirical formulas for the following molecules: (a) glucose, a substance also
known as either blood sugar or dextrose, whose molecular formula is C6H12O6; (b)
nitrous oxide, a substance used as an anesthetic and commonly called laughing gas,
whose molecular formula is N2O.
8. Predict the charge expected for the most stable ion of barium and for the most stable
ion of oxygen.
9. Which of the following compounds would you expect to be ionic: N 2O, Na2O, CaCl2, SF4?
10. What are the empirical formulas of the compounds formed by (a) Al3+ and Cl– ions, (b)
Al3+ and O2– ions, (c) Mg2+ and NO3– ions?
11. Name the following compounds: (a) K2SO4, (b) Ba(OH)2, (c) FeCl3.
12. Write the chemical formulas for the following compounds: (a) potassium sulfide, (b)
calcium hydrogen carbonate, (c) nickel(II) perchlorate.
13. Name the following acids: (a) HCN, (b) HNO3, (c) H2SO4, (d) H2SO3.
14. Name the following compounds: (a) SO2, (b) PCl5, (c) N2O3.
AP Chemistry Summer Assignment 2015
AP Chemistry Summer Assignment 2015
Resources: Online links
Protons Neutrons and Electrons
Sig Figs
Calculating Ave. Atomic Mass
Names and Formulas for Molecular and Ionic Compounds
Names and Formulas for Acids