12. On ellipse 1, place an " over the location of a focus. Now place an "X" on the orbit where the planet's orbital velocity (speed) would be greatest. On the lines below, explain how you know where to place your "X"

Using the periodic table, complete the table to describe each atom. type in your answers.a ? b? c? d? e? f?

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

8) a mixture of he, ne and ar has a pressure of 7.85 atm. if the ne has a mole fraction of 0.47 and 8) ar has a mole fraction of 0.23, what is the pressure of he? a) 4.2 atm b) 3.7 atm c) 5.5 atm d) 2.4 atm e) 1.8 atm