Which of the following is a pure substance that can be separated by physical means and can't be decomposed into other substances by chemical means

A: element

B:molecule

C: compound

D: mixture

What is the correct formula for dihydrogen monoxide?

Use your understanding of the ideal gas law to identify the correct relationships among the variables Pressure is Temperature is Volume is Moles are

Does it matter what initial concentration of reactants and products are used

7. Citric acid contains 37.5 g C, 58.3 g 0, and 4.2 g H and the MW = 192, what is the molecular formula?

The actual enthalpy of the magnesium flare reaction is - 603 kJ/mol. Your experimental value was likely different. Check all that apply. The coffee cup calorimeter may have absorbed some heat.

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.

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?