CHEMISTRY FOR BIO 311C
Practice Problems
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1) Compared to 31P, the radioactive isotope 32P has:
2) The mass number of an element can be determined by adding:
3) When atoms gain or lose electrons, they are known as:
4) The atomic number of an element is equal to the number of:
5) Describe two isotopes of the carbon atom. Be sure to use the terms protons, neutrons,
electrons, atomic number, mass number, and atomic mass.
6) Use the Carbon atom and describe its shells (energy levels), orbitals and electrons.
7) Use the Oxygen atom and describe its shells (energy levels), orbitals and electrons.
8) What is more likely to become a cation: Na or Cl? Why?
9) Which atom (H or O) is more likely to have a partial negative charge when joined
together in a water molecule? Why? What does this mean for the water molecule (H2O)?
10) How many covalent bonds do each of the elements listed below normally form?
Carbon Hydrogen Oxygen Sulfur Nitrogen Phosphorus
11) Compounds which are usually covalent in nature are found in which part of the Periodic
Table?
12) What is the molarity of 5.00 g of NaOH in 2.0 L of solution?
13) How many moles of NaCl are contained in 100.0 mL of a 0.20 M solution?
14) How many grams of NaCl are there in 100.0 mL of a 0.20 M NaCl solution?
15) What volume (in L) of 3 M HCl is needed to contain 1 mole of HCl?
16) How many grams of KCl are there in 5.50 liters of 0.50 M KCl solution?
