Which family in the periodic table has elements that are all radioactive

A dilute, aqueous potassium nitrate solution is best classified as a (1) homogeneous compound (2) homogeneous mixture (3) heterogeneous compound (4) heterogeneous mixture

The ions Cr3 + and O2 - combine to form the ionic chromium oxide. in what proportions do these ions combine to produce a neutral compound?

Which has the greater concentration of hydrogen ions, a substance with a pH of 5 or a substance with a pH of 4?

Particles are arranged in a crystal structure in a sample of (1) H2 (g) (3) Ar (g) (2) Br2 (l) (4) Ag (s)

The enthalpy of a reaction for a chemical change can be determined by

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?