Galena is an important economic mineral for which of the following? Question 7 options: lead gold platinum zinc

Consider a system consisting of a cylinder with a movable piston containing 106 gas molecules at 298 K at a volume of 1 L. Consider the following descriptions of this system:a. Initial system, as stated in the problem statement. b.

What are the only elements that exist in nature as uncombined atoms? What term is used to describe such elements?

How many valence electrons are in the Lewis structure of Methane (CH4) ? A. 2 B. 4 C. 6 D. 8 <- - I believe this is correct.

If 13.5 moles of oxygen are reacted with an excess of ammonia, how many moles of NO and of H2O are formes given the following equation. 4NH3+5O2 = 4NO + 6H2O

B) se o número de gaviões diminuir, a vegetação pode ser afetada?

If the cost of electricity is 8 cents/kWh, how much will it cost to use the light for a whole year (365 days) ?

Place the object into the graduate cylinder and record the new volume of water

Why nucleus is stable?

Which answer defines exothermic reaction

Enter a balanced chemical equation for the combustion of gaseous methanol.