How many ammonium ions and how many sulfate ions are present in an 0.250 mol sample of (nh42so4?

What type of reaction absorbs heat from the surrounding environment? A. Endothermic B. Exothermic C. Heterothermic D. Homothermic

How did john dalton contribute to the atomic theory?

What does it mean to say water is 11% hydrogen by mass

What phases are most common at high temperatures

According to these electron configuration, which element in group 15 would have the largest atomic radius? A. [Ne] 3s^2 3p^3 B. [He] 2s^2 2p^3 C. [Ar] 4s^2 3d^10 4p^3 D. [kr] 5s^2 4d^10 5p^3 E. [Xe] 6s^2 4f^14 5d^10 6p^3

If the bond enthalpy for a C-C bond is 348 kJ, what will happen when the C-C bond is formed?

How do you find moles

What volume of 0.500 M AgNO3 are needed to react with 100. mL of 0.400 M K2CrO4? 2 AgNO3 (aq) + K2CrO4 (aq) ➔ Ag2CrO4 (s) + 2 KNO3 (aq)

Nonpolar substances do not dissolve in polar solvents like water. If you're conducting an investigation to test the solubility of different substances, which on these substances do you expect to be insoluble in water? A. ammonia (NH3) B.

You mix together two different substances. There is a loud noise, and a burst of flame. Which of the following is most likely to be true?