1. Chemistry Final Exam Review
Modern Chemistry

2. A compound is _________.
a homogeneous substance
made of two or more elements chemically combined
made of two or more elements physically combined
both the first and second choices

3. The molar mass of an element is _________.
the mass of protons only
the atomic number, in grams
the pass of the protons and neutrons
the mass of one mole of that element

4. An isotope is ________.
atoms with the same number of protons and neutrons
an element with a charge
atoms of the same element that have different number of neutrons
none of the above

5. An atom with a + charge is called a(n) _________
anion
cation
dogion
muon

6. Valence electrons are ______.
electrons closest to the nucleus
only found in isotopes
only found in the d and f orbitals
are significant in determining how atoms form bonds

7. An atom with 9 protons, 9 neutrons, and 10 electrons is ____
an isotope
a neon atom
a fluorine ion
a fluorine atom

8. What is the total number of moles of sulfur atoms in 1 mole of Fe2(SO4)3?12 2

9. What is the correct formula for sodium nitrate?
NaNO2
Na(NO3)2
Na(NO)3
NaNO3

10. What is the correct formula for ammounium sulfate?
(NH4)2SO4
NH4(SO4)2
NH4SO4
(NH4)2(SO4)2

11. Name the compound NH4Cl. ammonium chlorate nitrate chloride
ammonium chloride
nitrogen hydroxide chloride

12. When the pressure of a gas is increased, the volume _____.
stays the same
increases
decreases
explodes

13. What are the units of STP?
0°C and 1 atm

14. At 120°C, the pressure of a sample of nitrogen gas is 1. 20 atm
At 120°C, the pressure of a sample of nitrogen gas is 1.20 atm. What will the pressure be at 200°C, assuming constant volume?
1.44 kPa
1.44 atm
14.4 atm
0.72 atm

15. The volume of gas at 25°C and 0. 100 atm is 600. 0 mL
The volume of gas at 25°C and atm is mL. What volume will the same gas sample occupy at STP?
5.5 mL
5.5 L
55.0 mL
550 mL

16. A weather balloon with a volume of 1
A weather balloon with a volume of 1.5 L is released from the earth’s surface where the pressure is 1 atm. What volume will the balloon occupy at an altitude of 20.0 km, where the air pressure is 0.2 atm? Assume a constant temperature.
75 L
7.5 L
7.5 atm
0.75 atm

17. A gas has a pressure of 1. 26 atm and occupies a volume of 7. 40 L
A gas has a pressure of 1.26 atm and occupies a volume of 7.40 L. If the gas is compressed to a volume of 2.93 L, what will its pressure be, assuming constant temperature?
31 atm
17.2 atm
3.18 atm
5.87 atm

18. The volume of a gas at 27. 0°C and 0. 200 atm is 80. 0 mL
The volume of a gas at 27.0°C and atm is 80.0 mL. What volume will the same gas sample occupy at standard temperature and pressure?
14.56 mL
1.46 mL
0.05 mL mL

19. The volume of a gas is 30. 0 mL at 27. 0°C and 1. 0 atm
The volume of a gas is 30.0 mL at 27.0°C and 1.0 atm. What will the volume be at 10.0°C and 0.5 atm?
67.92 mL
6.8 mL
22.22 mL
2.22 mL

20. Find the formula masses of the following compounds:
H2O 18 g/mol
NaCl g/mol
H2SO4  g/mol
Al2(SO4) g/mol   
Pb(NO3) g/mol

21. What is the number of atoms or molecules in 1 mole of anything?
6.02 x 1023
This is known as Avogadro’s Number!!!!

22. What is the volume of 1 mole of any gas at STP?
This is known as the molar volume and can be used for ANY gas as long as it is at STP.

23. Go to mole problems on review sheet.