The process by which ionic solids dissociate into respective ions is a: Select the correct answer below: chemical process physical process exothermic process none of the above
Upon the dissociation of potassium chloride, the potassium ions will interact with: Select the correct answer below: the positive end of water's dipole the negative end of water's dipole both ends of water's dipole potassium ions will not interact with water molecules
Of the following, which are characteristics of weak electrolytes? (select all that apply) Select all that apply: They produce a low concentration of ions when dissolved in water. They are soluble in water. They exhibit no conductivity. They exhibit low conductivity.
Covalent electrolytes are always: Select the correct answer below: strong electrolytes weak electrolytes nonelectrolytes depends on the substance
Which is NOT a covalent electrolyte? Select the correct answer below: HCl HBr CH3COOH NaCl
Which would conduct electricity best? Select the correct answer below: purified bottled water tap water ocean water these would conduct electricity identically
An electrolyte will yield ions by undergoing a: Select the correct answer below: physical change chemical change spontaneous change depends on the substance
To conduct electricity, a substance must contain which of the following? Select the correct answer below: ions metallic wires water freely mobile charged particles
Of the following, which are not true of ionic electrolytes? Select all that apply: HNO2 is an example of a ionic electrolyte. They yield ions by their dissociation in water. All ionic substances are soluble in water. They may be ionic compounds.
Which of the following occurs when an ionic compound dissolves in a polar solvent such as water? Select all that apply: The water molecules chemically react with the ions. The disorder of the ionic salt is decreased. The water molecules attract both the anions and cations in the ionic salt. The ions become solvated by water molecules, which reduces the electrostatic attractions between the ions.
Which will conduct the most electricity? Select the correct answer below: ionic electrolyte covalent electrolyte nonelectrolyte depends on the substances
A covalent electrolyte Select the correct answer below: dissociates nearly completely when dissolved under most conditions may be a strong acid yields ions when strong interionic forces are reduced experiences ion-dipole attraction
The process by which solute-solvent interactions are generated is called: Select the correct answer below: mixing solute distribution solvention solvation
Which of the following is not characteristic of a solution? Select the correct answer below: Its components (solute and solvent) may be in the same state. The solute particles are not visible in a solution. It is always homogenous. Its physical state is generally the same as that of the solute.
An instant cold pack is able to cool the skin upon contact because: Select the correct answer below: the dissolution inside the pack is an endothermic process the dissolution inside the pack is an exothermic process the evaporation of moisture from the skin is an exothermic process the evaporation of moisture from the skin is an endothermic process
Which term describes a solution with a solute concentration equal to its solubility? Select the correct answer below: Soluble Isosaturated Hypertonic Saturated
Which element has the highest charge density? Select the correct answer below: Na Mg Al K
In forming a solution, the solute always: Select the correct answer below: dissolves dissociates both dissolves and dissociates none of the above
Which element has the highest charge density? Select the correct answer below: K Ca Cs Be
A large amount of sugar is poured in a saturated sugar water solution at room temperature. Which of the following will DEFINITELY not happen? Select the correct answer below: Particles of sugar will be visible in the solution. The solution's solubility will be exceeded. No net dissolution of sugar will occur. The solution will become unsaturated.
Which of the following is a solution? Select the correct answer below: alloy milk italian salad dressing clouds
Identify the option below that is characteristic of a solution. Select the correct answer below: Its solvent and solute are always present in a 1:1 ratio. It is heterogeneous. Its components are dispersed on a molecular scale. Its physical state is always the same as that of the solute.
Dissolution is a process that can always be classified as: Select the correct answer below: exothermic endothermic unfavorable none of the above, it depends on the solution
Pentane, C5H12, is a very nonpolar hydrocarbon. Ethanol (C2H5OH) is somewhat more polar, with a polarity similar to that of water. Which pair of substances would likely form a solution? Select the correct answer below: pentane (C5H12) and water (H2O) water (H2O) and ethanol (C2H5OH) ethanol (C2H5 OH) and pentane (C5H12) none of the above
Which of the following favor the spontaneous formation of a solution? Select all that apply. Select all that apply: An increase in the disorder of a system An increase in the internal energy of a system A decrease in the internal energy of a system A decrease in the disorder of a system
Which of the following describes the process of dissolution? Select the correct answer below: endothermic only exothermic only either exothermic or endothermic isothermic
Which of the following is equal to the solubility of a solute in a particular solvent? Select all that apply: The maximum equilibrium concentration of solute that can be achieved. The amount of solvent required to dissolve 1 g of solute. The amount of solvent required to dissolve 1 mol of solute. The concentration of solute in a saturated solution.
When a solution is saturated and additional solute sits at the bottom of the vessel: Select the correct answer below: Some solute will precipitate but no more will dissolve, so the concentration will fall. More solute will dissolve, but no more will precipitate, so the concentration will rise. The solute will continue to dissolve and precipitate at precisely the same rate so that the concentration will remain fixed. There is no activity involving the solute and solvent, so the concentration will remain fixed.
If a supersaturated solution is introduced to a mechanical disturbance or a seed crystal, what will happen? Select the correct answer below: there will be further dissolution some solute will precipitate the solution will heat up depends on the solution
Solubility is determined by: Select the correct answer below: solute-solute forces solvent-solvent forces solute-solvent forces all of the above
Which of the following statements describes lattice energy? Select the correct answer below: It is the energy stored in the intermolecular attractions that hold particles together in an ionic solid. It is the energy of a solute. It is the amount of enthalpy change that occurs when 1 mol of ionic solid is converted into gaseous ions. all of the above
What is true about the hydration process? Select all that apply: Hydration is a solvation process where the solvent is water. The hydration involves breaking ionic solid and mixing in solvent. The hydration involves separating solvent molecules and mixing with ions in solution. The process is generally exothermic. The process is generally endothermic.
A 2.5 M solution of KBr has a volume of 0.10 L. If the solution is diluted to 0.45 L, what is the new concentration? Your answer should have two significant figures. Provide your answer below: M
The dilution equations are derived from the fact that: Select the correct answer below: dilution does not change the concentration of the solution dilution does not change the volume of the solution dilution does not change the moles of solute in the solution none of the above
Which of the following will decrease the concentration of a solution? Select all that apply. Select all that apply: adding more solute adding more solvent removing moles of solute removing solvent by evaporation
When diluting a solution, which of the following changes? Select all that apply. Select all that apply: solution volume solution concentration moles of solute liters of solvent
In the dilution equation, units can vary when expressing which of the following (so long as the same units are used on both sides of the equation)? Select the correct answer below: amount of solute density volume none of the above
A solution of NiCl2 with a volume of 50 mL and concentration of 0.10 M is diluted to a volume of 0.10 L. What is the concentration of the resulting solution? Select the correct answer below: 5.0 M 0.05 M 50 M 0.50 M
A 0.32 MNH4OH solution has a volume of 0.20 L, but it is diluted to a volume of 0.50 L. What is the concentration of the new solution? Your answer should have two significant figures. Provide your answer below: M
A 3.0 M solution has a volume of 0.20 L. In order to make this a 0.28 M solution, what volume must this be diluted to? Select the correct answer below: 2.1 L 2.6 L 3.1 L 3.8 L
Calculate the volume of a stock solution of Ba(OH)2, with a concentration of 0.10 M, needed to prepare 7.0 L of 0.096 M Ba(OH)2. Your answer should have two significant figures. Provide your answer below: L
A stock solution has a concentration of 0.15 M NaOH and is diluted to a 0.125 M solution with a volume of 0.20 L. What is the volume of the stock solution, in liters? Your answer should have two significant figures. Provide your answer below: L
A solution of 4.8 M KNO3 has a volume of 2.5 L. If this is diluted to 1.2 M what will be the final volume? Your answer should have two significant figures. Provide your answer below: L
A solution that is 0.1 L and 0.1 M of NiCl2 is needed but there is only a 0.2 M NiCl2 solution on hand. What volume of the stock solution is necessary to form the desired solution? Your answer should have one significant figure. Provide your answer below: L
A 1.6 M solution has a volume of 0.175 L. In order to make this a 0.28 M solution, what volume must this be diluted to? Select the correct answer below: 1.0 L 1.5 L 4.3 L 7.8 L
A stock solution has a concentration of 2.0 M and is diluted to become a 0.56 M solution with a volume of 3.0 L. What was the volume of the stock solution? Select the correct answer below: 0.79 L 0.84 L 0.93 L 1.02 L
A stock solution has a concentration of 0.30 MClO2 and is diluted to become a 0.20 M solution with a volume of 0.050 L. What was the volume of the stock solution? Select the correct answer below: 0.033 L 0.042 L 0.055 L none of the above
A solution contains 25 g of sugar in 5000 mL of solution. What is the mass-volume percentage of this solution? Select the correct answer below: 0.20% 0.30% 0.50% 0.70%
24 g of iron sulfate are dissolved in 152 mL of solution. What is the massvolume percentage of this solution? Your answer should have two significant figures. Provide your answer below: %
What is the volume percentage of 190 L of ethene in 301 L of solution? Your answer should have two significant figures. Provide your answer below: %
A solution made from 35 mL of ethanol and 75 mL of water has what volume percentage of ethanol? Your answer should have two significant figures. Provide your answer below: %
A solution is made by adding 27 g of barium chloride into 74 g of water. What is the mass percentage of this barium chloride in this solution, to the units place? Your answer should have two significant figures. Provide your answer below: %
The ratio of a component's mass to the solution's mass expressed as a percentage is known as: Select the correct answer below: the percent composition the molarity the molar mass the mass percentage
A solution contains 35 g of ammonium nitrate in 250 g of water. What is the mass percentage of ammonium nitrate in this solution? Your answer should have two significant figures. Provide your answer below: %
What is the volume percentage of 43 L of lactic acid in a solution with a total volume of 98 L ? Your answer should have two significant figures. Provide your answer below: %
A solution made by adding 29.0 L of KNO3 to 512 L of water has what percent volume of KNO3 ? Your answer should have three significant figures. Provide your answer below: %
What is the concentration, in ppb, of sodium chloride in a solution where 23 g of NaCl are dissolved into 1880 g of water? Your answer should have two significant figures. Provide your answer below: ppb
What is the concentration of the nitrogen in ppm if 1.3 mg is found in 2500 kg of soil? Report your answer in scientific notation. Your answer should have two significant figures. Provide your answer below: ppm
What is the mass-volume percentage of 100 g of a solute in 250 mL of solution? Your answer should have one significant figure. Provide your answer below: %
What is the mass-volume percentage of 50. g of solute in 66.7 mL of solution? Your answer should have two significant figures. Provide your answer below: %
Suppose you have a supersaturated lemonade solution. How do you change this solution to an unsaturated state? Select the correct answer below: Add more sugar Add more water Stir the lemonade None of the above
Solutions can be composed of: Select the correct answer below: solids and liquids. two solids. two liquids. Any of the above
A solution is a mixture that is composed of a that is present in a greater amount and a that is present in a lesser amount. Select the correct answer below: heterogenous, solvent, solute heterogenous, solute, solvent homogenous, solvent, solute homogenous, solute, solvent
The enthalpy of solution can be determined from what? Select the correct answer below: lattice Energy of the solute hydration enthalpy lattice energy of the solvent A & B A & C B & C
Of the following, which is a characteristic of nonelectrolytes? Select the correct answer below: They produce a low concentration of ions when dissolved in water. They produce a high concentration of ions when dissolved in water. They produce no ions when dissolved in water. None of the above
The correct classification for NH3 is Select the correct answer below: Covalent electrolyte Ionic electrolyte Nonelectrolyte None of the above
What type of change is dissociation? Select the correct answer below: Chemical Kinetic Physical Enthalpic
How many moles of KBr are contained in 25.0 mL of 4.80 M solution of KBr? Report your answer with three significant figures. Provide your answer below: moles
What is the molarity of HCl when 0.524 mol of HCl is dissolved in water to form 259 mL of solution? Report your answer with the correct number of significant figures. Provide your answer below: M
What volume of a 5.60 M solution of NaOH contains 1.74 g of NaOH ? Select the correct answer below: 0.311 mL 714 mL 7.77 mL 17.4 mL
What is the molarity of MgCl2 when 29.3 g of MgCl2 is dissolved in water to form 3.178 L of solution? Select the correct answer below: 10.3 M 0.989 M 9.22 M 9.68×10−2 M
How many grams of Mg(NO3)2 are contained in 50.0 mL of a 2.63 M solution? Your answer should have three significant figures. Provide your answer below: g
If 0.800 L of 12.0 M NaOH is diluted to 5.00 L, what is the concentration of the diluted solution? Your answer should have three significant figures. Provide your answer below: M
Which does NOT change during a dilution? Select the correct answer below: The moles of solute present. The volume of solvent added. The concentration of the resulting solution. The molarity of the solution.
A 3.46 M solution of NH4Br has a volume of 1.08 L. The solution is diluted with pure water to a concentration of 0.551 M. What is the volume of the solution? Report your answer to three significant figures. Provide your answer below: L
What volume of 6.49 M HCl is needed to prepare 2.11 L of 1.07 M HCl? Your answer should have three significant figures. Provide your answer below: L
What is the concentration (in ppm ) of C when 1.00 g of C is added to 4525 g water? Select the correct answer below: 221 ppm 2.21 ppm 0.221 ppm 2210 ppm
A solution is 5.00% by volume of ethanol dissolved in water. How many mL of ethanol are in 500.0 mL of the solution? Your answer should have three significant figures. Provide your answer below: mL