Which one of these equations is balanced? a. Zn + 2hcl - - > ZnCl2 + H2 b. S8 + 24F2 - - > 8SF6

a

b

a and b

neither

If 30. g of H, SO reacts, what mass of water is produced H2SO4 + 2 NaOH = Na2SO4 + 2 H20 A. 3.0 g B. 6.0 g C. 11 g D. 16 g

Express the answers to the following operation with the proper number of significant figures. 1.5+1.22

What is the pH of a solution that contains [H+] = 0.0023 M? Is the solution acidic or basic? Show your work.

A method of problem solving that uses the units that are part of a measurement to solve a problem

Which reactions are endothermic? (Select all that apply.) A. H2 (g) + ½O2 (g) H2O (aq), H = - 57.83 kcal/mole B. ½ N2 (g) + ½O2 (g) NO (g), H = + 21.6 kcal/mole C. ½N2 (g) + O2 (g) + 8.1 kcal NO2 (g) D. ½N2 (g) + 3/2 H2 (g) NH3 (g) + 11.

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?

Amalgam is an alloy that contains mercury and other metals. Which of these atoms would most likely form metallic bonds with mercury? Check all that apply. bromine copper hydrogen iodine silver tin

Which fossil fuel is the most widely consumed in the United States? A. petroleum B. natural gas C. peat D. coal

Why is the use of natural gas as a full becoming more common