Ms. Jacobson is demonstrating a chemical change for her class She places 15 g of baking soda into a beaker. Next, she add 15g (grams) of vinegar to
the same beaker. When the two substances make contact, they bubble and fizz. She
places the beaker on the balance and records a mass of the solution in the beaker is less
than 30g.

Why is the mass of the solution in the beaker less than 30g?

A: The Gas That was produced left the beaker

B: the new products have less mass than the original reactants

C: Mass is always lost in a chemical reaction

D: the gas was not working properly

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

What is the number of atoms in 3.54 mol s

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?