Chapter 9 Pre-Lecture HW

What is the overall balanced equation for the precipitation reaction occurring between silver nitrate and calcium bromide?

2AgNO3(aq)+CaBr2(aq)→2AgBr(s)+Ca(NO3)2(aq)

A student tests four solids for their ability to complete an electrical circuit when dissolved in water by observing their ability to close a circuit containing a light bulb and obtains the following results: *table* Which of the solids is a weak electrolyte when dissolved in water? The student is told that one of the four solids tested is actually magnesium bromide,MgBr2. Which of the solids could be MgBr2?

B, A and D

Which of the following is a nonelectrolyte? NaCl C6H12O6 (glucose) HF NaOH

C6H12O6 (glucose)

Water and toluene are not miscible. Which of the following is most likely the formula of toluene? Which of the following will be the most soluble in water?

C6H5CH3, CH3CH2CH2OH

What precipitate will form when aqueous solutions of sodium carbonate (Na2CO3) and calcium chloride (CaCl2) are mixed?

CaCO3(s)

Identify the pair of substances that would be soluble and form a solution when mixed. A--H2O solvent and I2 solute B--H2O solvent and CCl4 solute C--CCl4 solvent and NaCl solute D--H2O solvent and HCl solute

H2O solvent and HCl solute

Classify the substances according to the strongest solute-solvent interaction that will occur between the given substances and water during dissolution. NH3,CuSO4,C2H5OH,CuCl2

Ion-dipole forces- CuCl2, CuSO4 Hydrogen bonding-NH3,C2H5OH

Consider the following ionic compounds: CdCO3, Na2S, PbSO4, (NH4)3PO4, and Hg2Cl2. Which compounds will be soluble when added to water?

Na2S and (NH4)3PO4

Watch the animation, then check off the samples that will conduct electricity. NaCl solution Solid NaCl Solid sugar Sugar solution

NaCl solution

Identify the type of interactions involved in each of the following processes taking place during the dissolution of sodium chloride (NaCl) in water. interactions between the water molecules interactions involving dipole-dipole attractions interactions between the ions of sodium chloride interactions involving ion-ion attractions interactions formed during hydration interactions formed between the sodium ions and the oxygen atoms of water molecules

Solvent-solvent interactions-interactions between the water molecules,interactions involving dipole-dipole attractions. Solute-solute interactions-interactions between the ions of sodium chloride,interactions involving ion-ion attractions. Solute-solvent interactions-interactions formed during hydration,interactions formed between the sodium ions and the oxygen atoms of water molecules.

Identify which of the following substances is an insoluble salt. silver chloride ammonium chloride silver nitrate sodium sulfate

silver chloride

Predict the products for the following precipitation reaction: NiCl2(aq)+(NH4)2S(aq)→

NiS(s)+2NH4Cl(aq)

The solubility of a solid ____________________ with decreasing temperature while the solubility of a gas _____________________ with decreasing temperature.

decreases, increases

Five different substances are given to you to be dissolved in water. Which substances are most likely to undergo dissolution in water? potassium iodide, KI octane, C8H18 toluene, C7H8 sodium bromide, NaBr ethanol, CH3CH2OH

potassium iodide, KI sodium bromide, NaBr ethanol, CH3CH2OH

You have a solution of calcium chloride dissolved in water. You add some more solid to the solution and stir, and the solid dissolves. Then, you add just a spatula tipful of the solid and stir, and the solid does not dissolve. How could you describe the solution before and after adding the spatula tip amount?

unsaturated, saturated