2. Name each of the following ionic compounds: a) RuS b) PbCl2 c) Ag2O d) Fe2O3

Question

2. Name each of the following ionic compounds:
a) RuS b) PbCl2 c) Ag2O d) Fe2O3 e) Na2CO3 f) Cr2(SO4)3
3. Write the formula for each of the following ionic compounds:
a) potassium iodide b) strontium sulfite c) manganese(III)oxide
d) tin(IV) phosphate e) lithium sulfide f) silver nitride
4. Name each of the following molecular compounds formed fromsulfur and oxygen:
a) SO b) SO2 c) SO3 d) S2O e) S6O f) S7O2
5. Write the formula for each of the following molecularcompounds:
a) carbon tetrachloride b) dialuminum hexachloride c) antimonypentafluoride
d) tetraarsenic decaoxide e) dihydrogen monoxide f) tetraphosphorusheptasulfide
6. Name each of the following elements; identify each as arepresentative or transition element; and
classify each as an alkali metal, alkaline earth metal, transitionmetal, post-transition metal, metalloid, or
nonmetal:
a) Hf b) Be c) Te d) Ge e) Tl f) Cs
7. A 1.50-g sample of nitrous oxide (an anesthetic, sometimescalled laughing gas) contains 2.05 x 1022 N2O
molecules. How many nitrogen atoms are in this sample? How manynitrogen atoms are in 1.00 g of
nitrous oxide?
Chem 1151, General Chemistry I Spring 2009 15 points
Instructor: Brian D. Gute Page 2 of 2
Homework Assignment #2 Due: Friday 2/6/09, 3pm or earlier
8. A sample of ethanol (ethyl alcohol), C2H5OH, contains 4.2 x 1023hydrogen atoms. How many C2H5OH
molecules are in this sample? How many carbon atoms are in thissample?
9. Find the formula masses of the following substances to threesignificant figures.
a) sulfuric acid, H2SO4 b) phosphorus pentachloride, PCl5
c) potassium sulfite, K2SO3 d) calcium hydroxide, Ca(OH)2
10. Calculate the mass in grams of the following (report youranswer with correct significant figures).
a) 0.205 mol Fe b) 0.79 mol F
c) 5.8 mol CO2 d) 48.1 mol K2CrO4

Explanation / Answer

2. Name each of the following ionic compounds:
a) RuS   Ruthenium (II) sulfide

b) PbCl2 lead (ll) chloride plumbous chloride

c) Ag2O silver oxide

d) Fe2O3 ferric oxide

e) Na2CO3 sodium carbonate

f) Cr2(SO4)3 chromium sulphate
3. Write the formula for each of the following ionic compounds:
a) potassium iodide KI

b) strontium sulfite srso4

c) manganese(III)oxide mn2o3
d) tin(IV) phosphate sn(po4)2

e) lithium sulfide li2s

f) silver nitride ag3N
4. Name each of the following molecular compounds formed fromsulfur and oxygen:
a) SO sulphur monoxide

b) SO2 sulphur dioxide

c) SO3 sulphur trioxide

d) S2O disulphur monoxide

e) S6O hexasulphur monoxide

f) S7O2 heptasulphur dioxide
5. Write the formula for each of the following molecularcompounds:
a) carbon tetrachloride ccl4

b) dialuminum hexachloride al2cl6

c) antimonypentafluoride sbf5
d) tetraarsenic decaoxide as4o10

e) dihydrogen monoxide h20

f) tetraphosphorusheptasulfide ph4s7
6. Name each of the following elements; identify each as arepresentative or transition element; and
classify each as an alkali metal, alkaline earth metal, transitionmetal, post-transition metal, metalloid, or
nonmetal:
a) Hf halfnium   tetravalent transition metal,

b) Be berylium alkaline

c) Te tellurium

d) Ge

e) Tl

f) Cs
7. A 1.50-g sample of nitrous oxide (an anesthetic, sometimescalled laughing gas) contains 2.05 x 1022 N2O
molecules. How many nitrogen atoms are in this sample? How manynitrogen atoms are in 1.00 g of
nitrous oxide?
Chem 1151, General Chemistry I Spring 2009 15 points
Instructor: Brian D. Gute Page 2 of 2
Homework Assignment #2 Due: Friday 2/6/09, 3pm or earlier
8. A sample of ethanol (ethyl alcohol), C2H5OH, contains 4.2 x 1023hydrogen atoms. How many C2H5OH
molecules are in this sample? How many carbon atoms are in thissample?
9. Find the formula masses of the following substances to threesignificant figures.
a) sulfuric acid, H2SO4 b) phosphorus pentachloride, PCl5
c) potassium sulfite, K2SO3 d) calcium hydroxide, Ca(OH)2
10. Calculate the mass in grams of the following (report youranswer with correct significant figures).
a) 0.205 mol Fe b) 0.79 mol F
c) 5.8 mol CO2 d) 48.1 mol K2CrO4

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