How many grams of water must be used to dissolve 100.0 grams of sucrose (C₁₂H₂O) to prepare a 0.020 mole fraction of sucrose in the solution?​

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.

Drug abuse will not lead to physical and psychological dependence. true or false ?

Which characteristics can be used to differentiate star systems? check all that apply.