Which of these elements has two valence electrons? A. hydrogen B. barium C. nitrogen D. krypton E. bromine

1.6 moles of phosphorus, P8 reacts with oxygen gas to form tetraphosphorus decoxide. How many grams of P4O10 are formed? P8 + 5O2 - - > 2P4O10

Amy is asked to determine the chemical composition of an unknown liquid sample. She determines that the sample is negative for protein, simple sugars, and lipids. However, someone else has used up all of the iodine reagent.

What is the molecular geometry if you have 3 single bonds and 1 lone pair around the central atom?

Which of these does not cause a change in the reaction rate? A. density B. temperature C. concentration D. particle size

Does a bag of soil weigh kilograms or grams

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?