Solubility

At which temperature do KBr and KNO3 have the same solubility?

• 60

• 55

• 50

• Never

A molecule with a slight positive charge

on one side and a slight negative charge

on the other side is ___________.

• hydrates

• miscible

• polar

• saturated

Which of the following actions will NOT

increase the rate of dissolution

(dissolving)?

• Stirring the solution

• Decreasing the temperature

• Increasing the surface area of the

  solute

• Increasing the temperature

Which of the following is a solvent

• water in salt water

• sugar in sugar water

• oil in oil and water

• koolaid powder in koolaid

Which of the following is a solute

• water in salt water

• water in sugar water

• oil in oil and water

• koolaid powder in koolaid drink

How does a solution become supersaturated?

• dissolve lots of solvent in it.
• dissolve a little solute in it. 
• dissolve more solute than you should be able to. 
• dissolve a super amount of solvent in it. 

The "like dissolves like" rule is the reason why water cannot dissolve

• salt
• sugar
• vinegar
• oil

Water is polar because...

• The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
• The molecule has two poles, at which the it is colder than other regions of the molecule.
• The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.
• The water molecule is neutral.

Tags

NGSS.HS-ESS2-5

Sterling silver contains 92.5 percent silver and 7.5 percent copper. Which substance is the solute?

• silver
• copper
• platinum
• solids do not form solution

Air contains 78 percent nitrogen, 21 percent oxygen, and one percent argon. Which gas is the solvent?

• nitrogen
• argon 
• oxygen
• non of the above