Which of the following equations represents a double-displacement reaction?

A. FeS (s) + 2HCl (aq) ® H2S (g) + FeCl2 (aq)

B. 2Sb (s) + 3I2 (g) ® 2SbI3 (s)

C. Zn (s) + H2SO4 (aq) ® ZnSO4 (aq) + H2 (g)

D. 2HgO (s) ® 2Hg (l) + O2 (g)

Calculate the molarity of a solution that contains 2.25 mol of NaNO^3 dissolved in 3.00 L.

A student stated, there are 5 molecules of glucose (C6H12O6). A total of 30 atoms of carbon, 60 molecules of hydrogen, and 50 elements of oxygen.

These goats are eating grass on a sunny day. What is happening to the carbon in the air around the living things on the mountain? Is carbon moving into the air, moving out of the air, or both?.

If your chemical formula is 3H2O what is the 2 called

How many grams of iron are needed to produce 7.2 x 1022 particles of FeCl3?

A very small equilibrium constant means ... a. an equal amount of reactants and products c. more products b. more reactants d. system isn't at equilibrium

What is in a banana? give me specifics?!

When 17.28 mL of a 0.078 M aqueous solution of Na2SO4 is combined with 11.30 mL of a 0.20 M aqueous solution of NaCl and 7.84 mL of a 0.26 M aqueous solution of KCl, what is the total concentration of Na + in the combined solution?

What mass of carbon can 3000 J of energy raise from 12°C to 40°C?

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2