Which of the following diatomic molecules is joined by a double covalent bond?
a) o two
b) cl two
c) n two
d) he two

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes? or no? this question is worth 20 points! let it be correct!