A student places a 2.50 gram sample of magnesium metal in a bottle and fits the bottle with a 2-hole stopper as shown in the diagram below. Excess hydrochloric acid is added to the bottle causing an exothermic chemical reaction generating hydrogen gas. As the reaction proceeds, the gas travels through the tubing to an inverted bottle filled with water, displacing the air as the hydrogen gas is collected. Mg(s)+2HCl(g)=MgCl2(s)+H2(g)

Using the balanced equation above, calculate the volume hydrogen gas produced in the experiment at STP.

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa