What is the total number of electron pairs that are shared between the two carbon atoms in a molecule of ethyne?

(1) 1 (3) 3

(2) 2 (4) 4

Which substances have the same empirical formula and why?

phosphorus 32 has a half life of 14.3 days how much of a 4 mg sample of phosphuros 32 will remain after 71.5 days

Name 5 elements that we don't know what the state is at room temperature

What is the radioactive nucleus before it decays

Which of these is a compound? A. Steel B. Suger C. Air D. Nitrogen

4fe (s) + 3o2 (g) →2fe2o3 (s) how many grams of Fe2O3 are produced when 12.0 of iron rusts

Chromium 6 is commonly referred to as?

How does a parallel circuit differ from a series circuit? A. A parallel circuit had one path for electrons, but a series circuit has more then one path. B. A series circuit has one path for electrons, but a parallel circuit has more then one path. C.

Which of the following is an example of potential energy? -none of the above -A person jumping on a trampoline -a book on the shelf -A person running in place

One atom of silicon can properly be combined in a compound with a. three atoms of hydrogen. b. four atoms of calcium. c. two atoms of oxygen. d. one atom of chlorine.