What are two effects of the lack of gravity in astronauts? Select two answers. A. Excess if fluids in face and hands. B. compression of the back bone. C. weakness of muscles and bones. D. sleepnees. Pls help.

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

What type of reaction fuels the processes seen here?

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt