The energy needed to melt 1 g of a substance is called the

Be sure to answer all parts. Ammonia is a principal nitrogen fertilizer. It is prepared by the reaction between hydrogen and nitrogen. 3H2 (g) + N2 (g) → 2NH3 (g) In a particular reaction, 4.00 moles of NH3 were produced.

Which of the following are not created by an arrangement of electric charges or a current (the flow of electric charges) ? A. An electric field B. A magnetic field C. A quantum field D. A gravitational field

Describe three devices used in radiation detection

Which of the following energy level changes for an electron is most energetic? 3 → 2 5 → 2 4 → 2

The particles that are found in the mucleus of an atom are 1. neutrons 2. electrons only 3. protons and neutrons 4. protons and electrons

If you start with 100 grams of a radionuclide, how much will you have after two half-lives have passed?

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?