Chem 4 - Sample Exam #1

1. Complete each of the following:

A compound which contains only two elements is called a ____________ compound.

For an ionic compound, the positive ion is called the ____________ and the negative ion is called the ____________ .

When naming ionic compounds, we always name the ____________ first.

An isolated atom has a net charge of ________.

Ions are formed when an atom gains or loses _____________ . Do ions ever involve a change in the atom's nucleus? _____ Yes _____ No

The tendency to gain electrons is a fundamental property of the ______________ elements.

The tendency to lose electrons is a fundamental property of the ______________ elements.

Matter is anything that has ____________ and occupies space.

The three physical _________ of matter are: solid, liquid and gas.

The fact that potassium permanganate solutions are deep purple in color is an example of a ____________ property. The color change that occurs when potassium permanganate and iron(II) sulfate react are combined is an example of a ___________ property.

2. Name each of the following simple binary ionic compounds.

Na₂O ________________________

K₂S ________________________

MgCl₂ ________________________

CaBr₂________________________

BaI₂ ________________________

Al₂S₃ ________________________

CsBr ________________________

AgF ________________________

3. Write the formulas of the following acids:

nitric acid _________________

sulfuric acid __________________

phosphoric acid ________________

hydrobromic acid ________________

4. Name each of the following binary compounds of these nonmetallic elements

CBr₄ ________________________

N₂O₃ ________________________

PCl₃ ________________________

ICl ________________________

NCl₃ ________________________

SiF4 ________________________

5. Indicate whether the following name is correct or not for the formula shown.

_____ Yes _____ No Silver oxide, Si₂O

_____ Yes _____ No BaH₂, barium hydroxide

_____ Yes _____ No Trisodium nitride, Na₃N

_____ Yes _____ No Fe₂O₃, iron (III) oxide

_____ Yes _____ No SnCl₂, tin (IV) dichloride

_____ Yes _____ No Strontium hydride, SrH₂

6. Name each of the following acids:

HCl _______________________

H₂SO₄ _______________________

HNO₃ _______________________

HF _______________________

H₃PO₃_______________________

7. What is the valence of metal ion in each of the following compounds:

Na₂SO₄ _______________________

AlF₃ _______________________

CuS _______________________

Ca₃(PO4)₂____________________

8. Give the chemical symbol for each of the following

zinc ________________

silver ________________

uranium ________________

chromium _____________________

calcium _____________________

magnesium _____________________

9. List the names, symbols and atomic numbers of the top three elements in each of the following groups (example is given for Boron (B) in Group 3 with atomic number 5):

Group 3 __Boron___ , _B__ , _5_ | __________ , ____ , ___ | __________ , ____ , ___

Group 5 __________ , ____ , ___ | __________ , ____ , ___ | __________ , ____ , ___

Group 8 __________ , ____ , ___ | __________ , ____ , ___ | __________ , ____ , ___

10. For the following isotopes, give the number of protons, neutrons and electrons each has.

Isotope	# protons	# electrons	# neutrons
41Ti
64Zn
72Ge
41K

___ T ___ F Atoms that have the same number of neutrons but different numbers of protons are called isotopes.

___ T ___ F The mass number of a nucleus represents the total number of protons in the nucleus.

11. For each of the following, make the indicated conversions (show ALL work):

5550 mL to L:

7.5 miles to kilometers (1 mile = 5280 ft; 1 in = 2.54 cm):

-40 ^oC to ^oF:

68 ^oC to K:

12. Perform the following calculations to determine density, if the mass=121.4 g and the volume=42.4 cm3

density= __________________ g/cm3

13. Write each of the following numbers in scientific notation. Do not round or drop significant numeral, unless you are asked to do so for two of the numbers.

1,566,000 ___________________________

0.003856 ____________________________

522.65 _______________________________

0.00039 _______________________________

389.49 (3 sig fig) _______________ ________

103.351 (4 sig fig.) _______________________

16. Perform each of the following conversions, showing all conversion constants.

458 kg to mg:

87.5 cm to inches:

2.5 hours to seconds:

Extra Credit (4 points):

A sample of metal with a density of 2.7 g/ml. How much does a piece of this metal that has a volume of 3.55 cm3 weigh?

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