11.2 Electrolytes

a heterogenous mixture.

Chicken noodle soup is an example of A. Homogenous mixture. B. a pure substances. C. a heterogenous mixture. D. a compound.

hydronium ionsand chloride ions

HC1, a strong electrolyte, when dissolved, will generate: a. water molecules and chloride b. hydroium ions and chloride ions c. water molecules and hydrochloric acid d. hydronium ions and hydrochloric acid

heterogenous

Mixtures can be classified as homogenous or __________ A. disingenuous B. disordered C. heterogenous D. separated

Filtration

A heterogeneous mixture like sand and water can be separated by: A. cooling the vessel B. electrolysis C. shaking vigorously D. filtration

compound

A molecule comprised of more than one type of atom is called a(n): A. compound B. mixture C. element D. reactant

a compound

A molecule that us made up of more than one type of atom is known as

a compound

A pure substance that can be broken down by chemical change is known as: A. an element B. an atom C. a compound D. a mixture

a solid is dissolved in a solid.

An alloy is a solution in which: A. a gas is dissolved in a solid. B. a liquid is dissolved in a solid. C. a solid is dissolved in a solid. D. a solid is dissolved in a liquid.

depends on the substance

An electrolyte will yield ions by undergoing a: A. physical change B. chemical change C. spontaneous change D. depends on the substance

ocean water

Classify solutes in aqueous solution as strong electrolytes, weak electrolytes, and nonelectrolytes Which would conduct electricity best? a. purified bottled water b. tap water c. ocean water d. these would conduct electricity identically

homogeneous mixture

Clean swimming pool water is an example of a: A. homogeneous mixture B. heterogeneous mixture C. pure substance D. compound

depends on the substances

Describe the qualities of covalent electrolytes Which will conduct the most electricity? a. ionic electrolyte b. covalent electrolyte c. nonelectrolyte d. depends on the substances

the positive end of water's dipole

Describe the qualities of ionic electrolytes Upon the dissociation of potassium chloride KCl, the chloride ions Cl−will interact with: a. the positive end of water's dipole b. the negative end of water's dipole c. both ends of water's dipole d. chloride ions will not interact with water molecules

There is no limit as to how many atoms an element can consist of.

Elements are made of atoms that all have the same properties. How many individual atoms (all with the same properties) can a pure substance contain and still be considered an element? A. 1 B. 2 C. 4 D. There is no limit as to how many atoms an element can consist of.

all of the above

How do we physically measure conductance? A. applying a voltage to electrodes immersed in solution B. measuring elecrical current flow C. observing the brightness of a light bulb in a circuit D. all of the above

strong electrolyte

If an electrolyte generates ions in solution with 100% efficiency, that substance would be considered a: a. strong electrolyte b. weak electrolyte c. nonelectrolyte d. none of above

weak electrolyte

If only a small fraction of a dissolved substance generates ions in solution, that substance would be considered a: A. strong electrolyte B. weak electrolyte C. nonelectrolyte D. none of the above

a pure substance

If something is a compound, it is also A. an element B. a pure substance C. a mixture

dissolves

In forming a solution, the solute always: A. dissolves B. dissociates C. both dissolves and dissociates D. none of the above

Ion-dipole forces attract the polar water molecules to the ions at the surface of the solid.

In the dissolution of a compound, what occurs directly before the water molecules penetrate between individual ions and surround them? A. Ion-dipole forces attract the polar water molecules to the ions at the surface of the solid. B. Water molecules move directly to the center of the solid. C. The system undergoes a decrease in disorder. D. None of the above

Weak bases

Of the following, which are generally weak electrolytes? A. Completely soluble ionic compounds B. Strong acids C. Strong bases D. Weak bases

heterogeneous mixture

Oil and water is an example of a: A. homogeneous mixture B. heterogeneous mixture C. pure substance D. compound

solvent

The component of a solution that is present in the greater amount is called the: A. solute B. solvent C. solid D. depends on the solution

An alloy is a solid mixture of a metallic element and one or more additional elements.

The term alloy best fits ehich of the following descriptions? A. An alloy is a homogenous mixture of ionic solids. B. An alloy is a solid mixture of a metallic element and one or more additional elements. C. An alloy is a liquid-liquid solution. D. An alloy is a gas dissolved in a liquid.

A homogeneous mixture

There are two classifications for mixtures. Which of the following is one of those classifications? A. A binary mixture B. A homogeneous mixture C. A normative mixture D. none of the above

freely mobile charged particles

To conduct electricity, a substance must contain which of the following? A. ions B. metallic wires C. water D. freely mobile charged particles

False

True of false: a strong electrolyte always forms a very concentrated solution and a weak electrolyte always forms a very dilute solution. True False

Weak Base Weak acids

Which of the following are generally weak electrolytes? (select all that apply) A. Weak Base B. Strong bases C. Completely soluble ionic compounds D. Weak acids

either of the above

When electrolytes are dissolved in water, they undergo: A. a chemical change that yeilds ions B. a physical change that yeilds ions C. either of the above D. neither of the above

dissociation

When ionic compounds split up into individual ions in aqueous solution, this process is called: A. dissolving B. mixing C. dissociation D. individualiztion

Symmetric

When the electrostatic attractions between the ions in a crystal are so large that the increase in disorder cannot compensate for the energy required to separate the ions, the crystal is ________. a. symmetric b. insoluble c. soluble d. absorbed

A strong electrolyte is a substance that dissociates or ionizes completely when dissolved in water.

Which description best fits the definition of strong electrolyte? A. A strong electrolyte is a substance that dissociates or ionizes completely when dissolved in water. B. A strong electrolyte generates a current of electrons in solution. C. A strong electrolyte is a substance that splits water into hydrogen and oxygen by electrolysis. D. A strong electrolyte is any ionic substance.

They produce a high concentration of ions when dissolved in water. They exhibit high conductivity.

Which of the following are characteristics of strong electrolytes? (select all that apply) A. They exhibit no conductivity. B. They produce a high concentration of ions when dissolved in water. C. They are insoluble in water. D. They exhibit high conductivity.

A solution has a constant composition throughout A dissolved solute will not settle out or separate from the solvent in a solution.

Which of the following are defining traits of solutions? Check all that apply. A. A solution B. A solution has a constant composition throughout C. A dissolved solute will not settle out or separate from the solvent in a solution. D. The physical state of a solution is always the same as the dissolved solute.

A heterogeneous mixture is not uniform in composition. A heterogenrous mixture is not a pure substance.

Which of the following is TRUE about heterogeneous mixture? Select all that apply. A. A heterogeneous mixture is a solution. B. A heterogeneous mixture is not separated chemically. C. A heterogeneous mixture is not uniform in composition. D. A heterogenrous mixture is not a pure substance.

They exhibit no conductivity.

Which of the following is a characteristic of nonelectrolytes? A. They produce a low concentration of ions when dissolved in water. B. They produce a high concentration of ions when dissolved in water. C. They produce a high concentration of ions when dissolved in water. D. They exhibit no conductivity.

sugar water

Which of the following is a mixture? A. a bar of gold B. sugar water C. helium D. carbon dixode

Steel ( a mixture of carbon and iron)

Which of the following is an example of an alloy? A. Mud B. Rudy (chromium-doped aluminum oxide) C. Steel ( a mixture of carbon and iron) D. None of the above

Ruby (chromium-doped aluminum oxide)

Which of the following is not an examole of an alloy? A. Steel (a mixture of carbon and iron) B. Bronze (a mixture of copper and tin) C. Ruby (chromium-doped aluminum oxide) D. None of the above

electrolytes

Which of the following substances produce ions when dissolved in water? a. noneletrolytes b. electrplytes c. colloids d. none of the above

A mixture is a discrete unit of two or more atoms bound together.

Which sentence gives the correct definition of a mixture? A. A mixture is two or more pure substances combined. B. A mixture is a discrete unit of two or more atoms bound together. C. A mixture is two or more elements combined in a fixed ratio that cannot change.

potassium chloride

Which substance, when dissolved in water, will conduct the most electricity? A. ethanol B. potassium chloride C. acetic acid D. ammonia