14. Susan made a dry mixture of pebbles, flour, and epsom salts. She added 50 ml of water to the
mixture. She wants to separate the materials in this
order: first pebbles, second flour, and last epsom
salts. What order is the best way to do this?
a. Evaporation, filtering, screening
b. Screening, filtering, evaporation
c. Filtering, screening, evaporation
d. Evaporation, screening, filtering

When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? c7h16o(g) + o2(g) → co2(g) + h2o(g) -1 -5 -8 -16 -21

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.

Ihat will happen if i added baking soda to vinegar