In terms of ion charges and chemical change, what is the difference between CuF (s) and CuF2 (s) ?

Which compounds have the empirical formula CH2O? C2H4O2 C3H6O3 CH2O2 C5H10O5 C6H12O6

Why do you think the atomic number is basically represented by the number of protons and not the number of electrons?

Which of the following represents 1 mol of phosphine gas, PH3? A) 6.02 x 1023 phosphine molecules B) 34.00 g phosphine gas C) 22.4 L phosphine gas at STP D) all of the above E) none of the above

PH paper is put in a solution, which turns red. What is this? (A) A strong acid (B) A strong alkali (C) A weak acid (D) A weak alkali

A 1.25-g sample contains some of the very reactive compound Al (C6H5) 3. On treating the compound with aqueous HCl, 0.951 g of C6H6 is obtained.

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?