What causes the convection cell to turn downward

Boron has an atomic mass of 11. How many neutrons are in its nucleus? Use the periodic table if you wish.

If a compound contains 8.1 g of nickel and 2.29 g of oxygen, what is the mass percent of nickel in the compound

A marine weather station detects waves which are 8.0 meters long and 1.65 meters high and travel 4 meters each second. Determine the frequency of these waves.

A wave has a wavelength of 1.2 m and a wave speed of 24 m/s. What is the frequency of the wave? O A. 20 Hz O B. 0.035 Hz O c. 0.050 Hz O D. 29 Hz

Yasmin's teacher tells her that the solubility of salt is 360 g/L at room temperature (25 °C). How can Yasmin make an unsaturated salt solution?

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?

Which are the organs of the digestive system

For the separation of the unknown mixture, you are instructed to isolate the amine followed by the acid and finally the neutral. Does the order matter? If not, what other orders could be followed?