A saturated solution of copper (II) hydroxide is prepared in a beaker by adding the solid to water and stirring. When the solution is prepared, crystals of copper (ll) hydroxide remain on the bottom of the beaker.

Which change will cause the molar solubility of copper (II) hydroxide to increase?

A)addition of solid copper chloride

B)

addition of solid sodium hydroxide

C)

addition of aqueous hydrochloric acid

D)

dilution of the solution by addition of water

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

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

Which of the following would not diffuse through the plasma membrane by means of simple diffusion? 1 oxygen 2 glucose 3 a steroid hormone 4 a lipid soluble vitamin