Solutions and Electrolytes

An electrolyte is

• a metal

• a solution

• a liquid that conducts current

• all of above

Tags

NGSS.HS-PS2-5

the phenomenon of decomposition of an electrolyte when electricity is passed through is known as

• conduction

• coating

• electrolysis

• electrorefining

Tags

NGSS.HS-PS2-5

sea water is an example of

• bad conductor

• strong electrolyte

• weak electrolyte

• none of these

A technican prepared a solution by heating 100 mL of distilled water while adding KCl crystals until no more KCl would dissolve. She then capped the clear solution and set it aside on the lab counter. After several hours she noticed the solution had become cloudly and some solid had settled to the bottom of the flask. Which statement best describes what happened?

• As the solution cooled, evaporation of water increased the KCl concentration beyond its solubility.

• Water molecules, trapped with the KCl crystals, were released after heating.

• At lower temperatures the solubility of KCl decreased and recrystallization occurred.

• At increased temperatures the solubility of KCl increased and remained too high after cooling.

Tags

NGSS.MS-PS1-4

If an electrical current can run through a solution, it is said to contain

• magic

• nonelectrolytes

• electricity

• electrolytes

You can make a solid solute dissolve more quickly in a solvent by

• adding more solute.

• adding ice.

• heating the solvent.

• removing some solvent.

Tags

NGSS.MS-PS1-4

A solution that contains all of the solute it can hold at a given temperature is

• diluted.

• saturated.

• supersaturated.

• unsaturated.

A solution that is able to dissolve additional solute is best described as

• supersaturated.

• concentrated.

• saturated

• unsaturated.

The ability of a solute to be dissolved is called its

• nature

• mixture

• solubility

• solvent

Tags

NGSS.MS-PS1-2

Select all the factors which can affect the solubility of a substance

• temperature

• size of solute or the surface area of the solute

• the amount of stirring

• colour of the solute