Which of the following isotopes would most likely be unstable and therefore radioactive?

helium-3

calcium-40

molybdenum-98

mercury-194

Describe the scale used to measure the basicity of a substance. Demonstrate how you could differentiate a weak base from a strong one

Why does the size of the balloon increse after hot water is poured into the glass container

The bond angles in a molecule of boron trifluoride are A. 90 degrees B. 107 degrees C. 109.5 degrees D. 120 degrees

Which property describes a mixture? Select three options. It can be separated by physical methods. It has a single chemical composition. It can appear different from different sources. It cannot be described by a chemical symbol or formula.

What must be true about two objects for conduction to take place? The objects must be different temperatures and they must be in contact. The objects must be the same temperature and they must be in contact.

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?