Which species represents a chemical compound?

(1) N2 (3) Na

(2) NH4 + (4) NaHCO3

Apply Concepts Hard water contains calcium and magnesium ions. One way to soften water is to add sodium phosphate. Write complete and net ionic equations for the reaction of these two alkaline earth ions with aqueous sodium phosphate.

What is the volume, in liters, of 0.500 mol of CzHg gas at STP? 16.8 L 22.4L 11.2 L 0.0335 L

How many elements are in CaCl2?

The formation of a precipitate is an indication of a chemical change. a. True b. False

When aluminum (Al) reacts with chlorine gas (Cl2), aluminum chloride (AlCl3) is produced according to the balanced equation below: 2Al + 3Cl2 → 2AlCl3 If 20 atoms of aluminum react with 45 molecules of chlorine gas, which reactant is limiting and

Which answer best describes an alloy

Olive oil has a density of 0.92 g/mL. How much would 1 liter of olive oil weigh in grams?

How many grams of CO are needed to react with an excess of Fe2O3 to produce (210.3 g Fe) 209.7 g Fe? Show your work. CO (g) + Fe2O3 (s) - - > Fe (s) + CO2 (g)

Which is the molar mass of H2O? 10.02 g/mol 16.00 g/mol 17.01 g/mol 18.02 g/mol

When 4.70 g of a nonelectrolyte solute is dissolved in water to make 935 mL of solution at 28 °C, the solution exerts an osmotic pressure of 943 torr.