Adv Chem Unit 10 Exam POTENTIAL

Which of the following statements about water (H₂O) is TRUE

• Water is a polar solvent which easily dissolves many polar or ionic substances
• Water is a polar solvent due to its linear geometry and unshared pairs of electrons on the central oxygen atom 
• Water has an unusually low boiling point due to the strong hydrogen bonding that occurs between molecules of water
• Water is a non-polar solvent which easily dissolves many non-polar substances

Write the equation for the dissolution of magnesium chlorate, Mg(ClO₃)₂, in water. How many total moles of ions are produced for every 1.72 mol of magnesium chlorate dissolved?

• 1.72 mol

• 5.16 mol

• 3.44 mol

• 6.88 mol

Which of the following solutions will most likely light up the bulb when tested for conductivity?

• D

  diphosphorus tetroxide is an ionic compound that will ionize into charged particles in solution

• B

  potassium bromide is an ionic compound that will ionize into charged particles in solution

• A

  carbon dioxide is a covalent compound that will NOT ionize into charged particles in solution

• C

  glucose is a covalent compound that will ionize into charged particles in solution

You can increase the rate of solvation of a solid solute in liquid solvent by

• heating the mixture.

• crushing the solute.

• stirring the mixture.

• All are correct.

Which substance is least soluble at 60◦C?

• KI
• NaNO₃
• KNO₃ 
• NH₃ 

120g of Solid A is placed in 100g of H₂O at 50°C. A second, separate 120g sample of Solid A is placed in 100g of H₂O at 80°C. Each sample is stirred until as much of each sample as possible is dissolved. How do the solutions compare at the two temperatures?

• SATURATED at 50°C; SATURATED at 80°C

• UNSATURATED at 50°C; UNSATURATED at 80°C

• SATURATED at 50°C; UNSATURATED at 80°C

• UNSATURATED at 50°C; SATURATED at 80°C

What is the molarity of a 3.244 L solution that is made from 12.75 g of NaCl? 

• 0.06725M
• 3.930M
• 0.2544M
• 14.89M

How much NaCl is in 1.94 L of 0.500 M NaCl?

• 0.970 mol

• 0.258 mol

• 3.88 mol

• 56.77 mol

If 60.0 mL of a 1.5 M HCl solution is put into a flask and diluted with water to make 2.0 L of solution, what is the molarity of the final solution?

• 0.045 M
• 0.080 M
• 0.75 M
• 0.020 M 

A variety of ions including Na⁺, K⁺, NH₄⁺, Pb²⁺, Fe²⁺, NO₃⁻, Cl⁻, Br⁻, S²⁻, and CO₃²⁻ are mixed in a beaker of water. After mixing, which substances would you expect to find as precipitates?

• FeCl₂ and KCl

• PbCO₃ and NaCl

• FeS and Na₂CO₃

• PbS and FeCO₃