Which element has the greatest density at STP?

(1) scandium (3) silicon

(2) selenium (4) sodium

Compare the evaporation of a contained liquid with that of an uncontained liquid.

How, exactly, would altering the pH in a solution affect a living organism and how do organisms prevent large pH fluctuations?

When a wave moves, what happens to the medium? A it moves forward with the wave B it moves only perpendicular to the energy of the wave C it moves up and down or back and forth, but it does not move forward with the wave D it moves only parallel to

Which predictions can most likely be made? A. Sb has a lower ionization energy but a higher electronegativity than I. B. Sb has a higher ionization energy but a lower electronegativity than I. C.

What is the name of the compound having the formula (nh4) 2[cu (cn) 4]?

What is the shape of a molecule with a triple bond?

4FeS2 + 11O2 > 2Fe2O3 + 8SO2 Given 75.0 grams of iron (IV) sulfide, how many grams of sulfur dioxide are produced?

Cytotoxic t cells can attack target cells with which chemical weapons?

What are some reasons why the research should be put through a peer-review process?

Which of the following examples is a compound containing an ionic bond? A. O2 B. H2O C. CaO D. CH4