What do we call compounds that will not dissolve in water

When a liquid evaporates - does it take energy from its surroundings or does it give off energy to its surroundings?

The chemical combination of two or more different atoms in fixed amounts is called a (n)

Which of the following would contain 48 electrons?

What chemical property differentiates sulfurous acid from sulfuric acid?

Problem 4 Calculate the mass of ethane, C2H6, which must be burned to produce 100 kJ of heat. 2 CzH6 (9) + 7 02 (9) - --> 4CO2 (g) + 6 H2O (1) AH = - 3120 kJ

The characteristic flame test colors of metal ions are due to atomic emission spectra. Duscuss the relationship between the absoption and emission of light and the factors responsible for flame test colors.

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from

What classification should this reaction have? 4Al + 3O2 → 2Al2O3

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.