when holly injures her shoulder she uses an ice pack. she activates the ice pack releasing the urea. what process does she observe as she uses the cold pack?

for 2Na (s) + Cl2 (g) - >2NaCl (s) how many grams of sodium chloride will be made from 115 g of sodium metal when when reacted with excess chlorine gas

Phase or state of matter

Which compound is most likely the strongest electrolyte?

The extraction of pure copper is expensive. Give one reason why

Nitrifiers are bacteria a. capable of living in symbiosis in the roots of some plants. b. capable of oxidizing NH3 using NO. c. that convert N2 to NH3. d. that generate nitrites or nitrates. e. capable of using NH3 as an electron donor.

Extend E1 Explain why the arrangement, movement and energy of particles change during changes of state.

What is in a banana? give me specifics?!

Addition of an excess of lead (II) nitrate to a 50.0mL solution of magnesium chloride caused a formation of 7.35g of lead (II) chloride precipitate. What was the molar concentration of chloride ions in the solution (in mol/L) ?

2.70 L of a gas has a pressure of 0.63 atm. What is the volume of the gas at 105 kPa?

Which statements describe Rutherford's model of the atom? Select all that apply.