wich factor determines if you'll hear an echo of your voice off of a hard surface? A. your mass B. your distance from the wall C. your height D. temperature of the wass​

Nickel crystallizes in the face-centered cubic (fcc) lattice. the density of the metal is 8902 kg/m3. calculate the radius of a nickel atom.

Imagine a small synthetic vesicle made from pure phospholipids enclosing an interior lumen containing 1 mm glucose and 1 mm sodium chloride. if the vesicle is placed in pure water, which of the following happens faster? a. na+ diffuses out. b. cl– diffuses out. c. h2o diffuses in. d. glucose diffuses out. e. sodium chloride diffuses out.

The plant food contains nh4)3po4 what tests would you run to verify the presence of the nh4 ion and the po4 ion