Balance the following equation. If the coefficient is one, put 1 in the blank.     [fish1]PCl5   + [fish2]H2O –> [fish3]H3PO4 + [fish4]HCl

If you were given the following values that come directly or indirectly from measurements, what will you assume is the range of possible values that they represent? 2.2 L (the volume of a basketball)     [ans5]   3 μm (the diameter of a hair)       [ans6]   2.0 X 10-6 m (the diameter of a proton)       [ans7]   1.98 X 105 kg (the mass of a whale)       [ans8]

Mass is usually defined as a measure of the amount of matter in an object. Which statement is not true about matter?

There are seven diatomic molecules. Name four of them. Give their molecular formula as found in nature.

Balance the following equation. If the coefficient is one, put 1 in the blank.   [cow1]C2H5SH + [cow2]O2 –> [cow3]CO2 + [cow4]H2O + [cow5]SO2

What component of the atom gives it its identity?

Prefixes are used to described base units in terms that relate to the subject being studied. For example we measure long distances in kilometers rather than meter or millimeters. It is important to understand what these prefixes mean. So, how many micrograms are in a megagram? Write your answer using scientific notation.

Calculate the range for this sample (note, data are the same for questions 4 and 5) 100, 4, 7, 96, 80, 3, 1, 10, 2

Calculate the median of the following data (note, data are the same for questions 1, 2, and 3)  18, 10, 15, 13, 17, 15, 12 ,15, 18, 16, 11

These microorganisms normally do not causes disease in people, however, when someone’s body immune defenses are compromised or weakened, these organisms can cause disease.  These organisms are known as …..