How many valence electrons does selenium have?

40.0 g neon and 40.0 g helium has a total pressure of 0.900 atm, what is the the partial pressure of the neon?

The electron pair geometry of a molecule is tetrahedral. What is its bond angle if it shows one lone pair of electrons and three bonding pairs? A) Less than 109.5° B) More than 109.5° C) Equal to 109.5° D) Zero

Oxidation Number of fe in fe3o4

A 32 L samples of xenon gas at 10oC is expanded to 35 L. Calculate the final temperature. 299.3K 325.4K 273.5K 309.5K ik its not C

Which is a third stage of cellular respiration

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?