[Note: The Practice Test is for practice only. None of these items will appear on the actual test. The items on the test are selected from the assigned problems and those shown in class.]
1. Fill in the blanks with the correct words, terms, phrases, or numbers.
a. ________________________________ is the component of the atom that has a negative charge and a mass of 1/1837 u.
b. _______________________________ is the average mass of the naturally occurring isotopes of an element compared to 12C.
c. Isotopes are atoms with the same _______________________________ but have different _______________________________.
d. ______________________________ is the formula that expresses the simplest ratio of atoms in a molecule.
e. A(n) ______________________________ is a region of space around the nucleus of an atom in which a high probability exists for finding electrons.
f. ______________________________ is the type of radiation composed of high-energy helium nuclei.
g. ______________________________ is the maximum number of electrons in the f sublevel.
h. The ________________________ orbital fills after the 5s.
i. ________________________ is the Lewis symbol for selenium.
j __________________________ is the atom with an electron configuration of 1s2.
k __________________________ is the father of the modern periodic table.
l __________________________ is the amount of energy needed to remove the most loosely held electron from a neutral gaseous atom.
2. Write the complete electronic configurations for:
a. Ge ______________________________________________
b. Rn _______________________________________________
3. Circle the one atom that best fits the following descriptions.
a. largest atom Be Mg B Al
b. least metallic C Si Ge Sn
c. lowest melting point Li P H B
d. highest ionization energy F Cl Ne Ar
e. thermal conductor Co S Br He
f. lowest density C Cl Ni Ca
g. lanthanide Th Ba Ce Li
h. insulator P K Ba Al
i. alkaline earth metal Mn Na Cu Ca
j. largest noble gas
Ar Rn Xe
4. What mass of C5H12 contains 2.22 x 1023 atoms of H?
5. What is the percent composition, expressed to four significant figures, of (NH4)2S?
6. A borane is analyzed and found to contain 11.843 g B and 0.885 H. What is the empirical formula of this borane?
7. What is the mass of NaClO3 needed to produce 4.22 L of 0.188 M NaClO3?
Note to Students:
If you have a problem with one or more of these items, I will only respond through the WWWolfe Chemistry Forum. Thus, all students will have access to the answers that I give. Note that I will not solve these problems for you. I will give you guidance and direction.