The density of potassium is 0.862g cm-3 at room temperature, with atomic weight of 39.1g/mol. use only these two parameters together with avogadro’s number calculate: a) how many atoms are there in one cubic centimeter of solid potassium at room temperature? b) potassium has body-centered cubic (bcc) crystal structures. use this fact, together with your answer from part (a) determine the lattice parameter

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

Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2:

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