Use the van der Waals equation to calculate the pressure, in atm of 37.98 mol of hydrogen at 391 °C in a 2.2 L container. Values of van der
Waals Constants for Some Common
Gases
Gas
atm 1
mol
mol
He
Н.
0.034
0.244
1.39
1.36
0.0237
0.0266
0.0391
0.0318
0.0562
0.0427
0.0428
3.59
2.25

X

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Compare and contrast physical changes with chemical changes.

Give the set of reactants (including an alkyl halide and a nucleophile) that could be used to synthesize the following ether: draw the molecules on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars, including charges where needed. ch3ch2och2ch2chch3 | ch3