A pure substance is found to have an empirical formula of CH and a molar mass of 78.114 grams. What is the molecular formula of this substance?

The van der Waals forces of attraction between molecules always become stronger as molecular size 1) decreases, and the distance between the molecules increases 2)) increases, and the distance between the molecules decreases 3) decreases, and the

Calculate the pOH of an aqueous solution at 298 K when the hydroxide ion concentration is 3.7 x 10-5 M.

List the ways you can tell that a chemical change has taken place in a substance.

Which describes mid-oceanic ridges? A. transform plate boundary between oceanic plates B. convergent plate boundary involving an oceanic plate C. divergent plate boundary in oceanic plates D. divergent plate boundary in a continental plate

If you traveled to mars, what would be true? A. You would have the same mass, but you would weigh more B. You would have less mass, and you would weigh less C. You would have the same mass, but you would weigh less D.

What is the scientific equesion to make antimatter?

How many molecules of molecular oxygen react with four molecules of NH3 to form four molecules of nitrogen monoxide and six molecules of water?

How many unchanged atoms would remain after 3 half-lives if the initial sample had 600 atoms? Explain.

Chegg Identify the type of reaction [ (combination (c), decomposition (d), combustion (co), single replacement (sr), double replacement (dr), or neutralization (n) ] and write a balanced equation. If there is no reaction, write NR.

A sample of a radioactive isotope initially contains 20 x 10^10 atoms. After 16 days, 5 x 10^10 atoms remain. what is the half-life of the isotope? A) 12 days B) 20 days C) 10 days D) 16 days E) 8 days