PERIODIC TABLE CROSSWORD 5
18
10
11
Across
2. Group I metals
4. Elements in the middle of the periodic
table are the metals.
5. The sum of the protons and neutrons is
the number
6. Inactive gases.
7. The horizontal rows are called
8. Most of the elements are
10. Nonmetals tend to form lons.
Down
1. Most active nonmetals
2. Group II metals
3. Atomic number is the number of -
7. Metals tend to form_lons.
9. The elements are arranged by atomic
11. The vertical columns are called families
or -

How does decreasing the gas volume affect the pressure of a gas?

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.

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?