The two most abundant elements in the universe are:

a. Hydrogen and Oxygen

c. Hydrogen and Helium

b. Oxygen and Nitrogen

d. Carbon and Oxygen

Which would you allow vitamins to enter your bloodstream faster: swallow a pill or eat a chewing vitamin

What would be the mass of 1.98*10^28 molecules of H2O

Place the following in order of increasing F-A-F bond angle, where A represents the central atom in each molecule.

What type of intermolecular bond occurs between two water molecules? dipole to dipole hydrogen ionic polar covalent

How can you tell if a chemical reaction occurred? A. Change in color B. Created gas C. Change in Temperature D. Formed a precipitate E. All of the above

14. What steps should you take to keep parents and the public from viewing your personal information on social networks?

Match the factors which affect the rate of dissolving/dissociation/diffusion.

How would the equilibrium of an exothermic reaction at 25°c be affected if the temperature of the system were reduced? (hint: apply le chatelier's principle) ?

Which is the most practical argument for the continued funding of space exploration? a) Space exploration will one day show whether life exists on other planets in star systems similar to ours.

33 protons 36 electrons 45 neutrons