During a solvent extraction, a student lost track of which layer was the aqueous layer and which layer was the organic layer. what simple, non-destructive test could be used to determine which layer is which?

a. add a little distilled water to see which layer the water adds to

b. obtain a sample of the solution in the seperatory funnel and ultilize ir

c. ask the instructor if you can perform a supercritical extraction of the sample

c. obtain a sample of solution in seperatory funnel and utilize infrared spectroscopy (ir).

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

What element has similar physical and chemical properties as boron.

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative