Which of these is an example of a physical change

A breaking chemical bonds

B melting a substance

C nuclear decay

D forming chemical bonds

Based on the electron configuration of the two atoms, predict the ratio of metal cationic (+) atom to nonmetal anionic (-) atom in the compound. Lithium 1s^2 2s^1 Oxygen 1s^2 2s^2 2p^4 A. 1:1 B. 1:2 C. 2:1 D. 3:1

Computers are capable of inductive reasoning. True False

Calculate the concentrations of all species present in a 0.25-M solution of ethylammonium chloride (C2H5NH3Cl).

The graph shows the temperature of a pure substance as heat is added to it. Label each statement with the correct number. liquid boiling only solid present only gas present mixture of solid and liquid present liquid being heated

Describe the electrolytic process for refining copper.

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?