Exam 4: Solution Chemistry and the Hydrosphere

When the oxidation-reduction reaction shown here is balanced, how many electrons are transferred for each atom of copper that reacts? Ag⁺(aq) + Cu(s) Ag(s) + Cu²⁺(aq)

Chalk is mostly calcium carbonate. Could chalk-dust catch fire and burn in air?

Identify the base in the following acid-base reaction. PbCO₃(s) + H₂SO₄(aq)  PbSO₄(s) + CO₂(g) + H₂O( )

What is meant by the terms solution, solvent, and solute?

Magnesium metal burns brightly in the air to make a white powder. What are the likely products?

What volume of 12 M HCl solution needs to be diluted to produce 500 mL of 3.0 M HCl solution?

Commercial hydrochloric acid is 12.1 M. What volume of commercial HCl solution should be used to prepare 250.0 mL of 3.00 M HCl?

The thermite reaction is used in welding applications and chemistry demonstrations because it releases a tremendous amount of energy. Which of the following statements is not correct regarding this reaction? 8Al + 3Fe₃O₄ 9Fe + 4Al₂O₃

A chemistry student attempted to make a 0.2000 M solution of NaCl using a 100.0 mL volumetric flask. She added exactly 100.0 mL of water to the flask, then added 0.02000 mol of NaCl, and found that the total volume in the flask was above the 100.0 mL mark. What was the concentration of the solution?

Sodium fluoride is added to drinking water in some municipalities to protect teeth against cavities. The target is to convert hydroxyapatite, Ca₁₀(PO₄)₆(OH)₂, into more stable fluorapatite, Ca₁₀(PO₄)₆F₂. The EPA currently restricts the concentration of fluoride in drinking water to 4 mg/L. Express this concentration in parts per million (ppm).

A salt solution is added to a marine aquarium. What mass of sodium chloride is needed to produce 250.0 mL of a solution that has a concentration of 0.0500 M ?

Nitrogen-fixing bacteria and plants are capable of converting atmospheric nitrogen to ammonia. This process is an example of __________

One type of alcohol breathalyzers used by law enforcement involves the following reaction. The amount of ethanol present is determined by a change in color of the solution. What type of reaction is this? 3CH₃CH₂OH(g) + 2K₂Cr₂O₇(aq) + 8H₂SO₄(aq)  3CH₃COOH(aq) + 2Cr₂(SO₄)₃(aq) + 2K₂SO₄(aq) + 11H₂O

Which one of the following statements regarding a strong acid is not correct?

Which one of the following statements regarding a weak acid is not correct?

A homogeneous mixture of two or more substances is called __________

In the dilution of 10.0 mL of a 0.10 M solution of HCl to a volume of 20.0 mL, what remains unchanged?

What would be the products in the ionic equation for the following reaction? 2HBr(aq) + 2KOH(aq)  products I. K⁺(aq) and Br^-(aq); II. KH(aq); III. H₂O( ); IV. KBr(s); V. BrOH(aq); VI. KBr(aq)

If the molar concentration of sodium sulfate (Na₂SO₄) is 0.10 M, what is the concentration of sodium ion?

In a titration, the solution of known concentration delivered by the buret is called the titrant, and the solution being titrated is called the analyte. To carry out a calculation to determine an unknown concentration of a sample from titration data, one would need all of the following data except __________