11.Which shows the order of decreasing atomic size? a. Si, Al, Mg, Na
b. I, Br, Cl, F
c. Be, Mg, Ca, Sr
d. C, P, Se, I

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid

The movement of tectonic plates and in two locations is described below: location a: tectonic played push together location b: tectonic plates push apart

The reaction below shows a system in equilibrium. how would a decrease in temperature affect this reaction? a. the rate of formation of the gases would increase. b. the equilibrium of the reaction would shift to the left. c. the equilibrium would shift to cause the gases to sublime into solids. d. the chemicals on the left would quickly form the chemical on the right.