What group in the periodic table tends to form –2 ions? 

In the movie, The Martian, the main character attempted to make water through combustion of hydrogen gas according to the equation below: How many moles of water can be produced starting with 10 mol of oxygen gas?  Hint: Ensure the equation if balanced before proceeding.

What is the mass % of oxygen in carbon dioxide (CO2)?

10 mm is equivalent to how many meters?

A sample of unknown material has a mass of 2000 mg and occupies a volume 0.002 cm3. What is the density of this unknown material?

IgM, IgG and complement get deposited in the joints of rheumatoid arthritis patients.  This is an example of:

List 4 types of bacteria that are currenlty being considered to be an urgent, serious or concerning threat for antibiotic resistance by the Centers for Disease Control.  Both genus and species name must be given in the correct format for full credit.

In Graves’ Disease, antibodies are produced to target a specific type of hormone.  What is the hormone that is targeted?

Which type of bond results from the sharing of electron pairs between atoms?

A beam of light has a wavelength of 500. nm. What is the frequency of the light?