Review problems on chapter 1, 2, and 3.
1. How many significant figures in the following numbers?
a. 0.005340 ______ b. 6.022 x 1023 ______ c. 400 ______
2. Write the following figures in scientific notation.
a. 3480000000 _______ b. 0.0000000079
3. Solve with correct number of significant figures.
2.703 × (0.0389 + 13.27)
4.35 − 1.0087
4. Convert each unit to the unit which is in parentheses.
a. 36 oC(oF)
b. 0 K (oC,oF)
c. 113oF (oC)
d. 7.2km (mm)
e. 342.8nm (dm)
f. 43.8kg (Gg)
g. 2.4x10-4g (ng)
5. Calculate the density of a sample which weighs 7.8 g in 3.2cm3.
6. Answer the number of A, Z, and symbol of X for the following elements.
a.
A:_______
b. # of protons:20
A:______
Z:_______
# of neutrons:21
Z:______
X:_______
# of electrons:18
X:______
7. Name the following compounds.
a. Zn3(PO4)2 ______________________ b. H2SO3 ___________________________
c.Cd(ClO)2_________________________ d. NH4OH__________________________
e. P4O6___________________________ f. OF2______________________________
8. Write the formulas.
a. acetic acid ________________ b. copper(I) sulfide___________________
c. Bismuth(III) perchlorate ___________ d. Mercury (I) cyanide____________
9. How many molecules(atoms) are present in the following?
a. C atoms in 132.03g of CO2
b. H molecules in 4 mol of sulfurous acid.
10. Calculate the mass percent of all elements in zinc nitrate.
11. Find the empirical formula and molecular formula for vitamin C which is
composed of only C, H, and O. Its molar mass is 176.1g. Given 40.9% C, 4.58% H,
and 54.5%O.
12. Balance the following equation and answer the questions.
____Al + _____CuO ―――――――――――→ _____Al2O3 + _____Cu
a. What is the limiting reactant?
b. If you have 43.8 g of aluminum and an abundant amount of CuO, how many
grams of copper do you expect to get?
c. For b, you actually get 117.5 g of Cu. What is the percent yield?
13. Gallium consists of two naturally occurring isotopes with masses of
68.926 amu and 70.925 amu. The average atomic mass of Ga is 69.72amu.
Calculate the abundance of each isotope.