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There is a difference between counted values and measured values. Which statement is true?

Consider sulfur. How many electrons does an atom of elemental sulfur have?  [blu4] How many valence electrons does it have?  [blu5] If sulfur combined with sodium, how many sodium atoms would end up in the compound? [blu6] Would the resulting compound be ionic or molecular?  [blu7]  

For a given atom or molecule, which form (solid, liquid, gas) of the substance will have the greatest freedom of motion?

Solids, liquids, and gases of a given element differ from each other in the following way.

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

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.