Which of the following is a heterogeneous mixture

• water
• Salt dissolved in water
• chex mix
• air

Which of the following does not increase the rate of dissolving a solid in a liquid?

• stirring the solution
• crushing up the solute
• raising the temperature of the water
• lowering the temperature of the water

Tags

NGSS.HS-PS3-4

Why will sugar dissolve in water?

• sugar is ionic
• sugar has a similar polarity to water
• sugar will not dissolve in water
• sugar has similar energy to water

Calculate the molarity of a solution prepared by dissolving 78.2 grams of CaCl₂ in 500.0mls of water

• 0.156 M
• 0.709 M
• 0.353 M
• 1.41 M

How many grams of ammonium chloride are needed to make a saturated solution at 80^o C?

• 50 grams
• 80 grams
• 65 grams
• 75 grams

At 40^oC which salt is least soluble?

• KClO₃
• NaCl
• KI
• KNO₃

Tags

NGSS.HS-PS1-3

What kind of solution is made from 50 grams of KNO₃ at 40^oC?

• saturated
• unsaturated
• supersaturated

Which will dissolve the slowest

• powdered sugar in hot water
• Powdered sugar in cold water
• sugar cubes in hot water
• sugar cubes in cold water

Tags

NGSS.HS-PS1-5

Which of the following solutions made from one mole of the following solutes in 100.0 mls of water has the lowest freezing point?

• MgBr₂
• Al₂(CO₃)₃
• NH₄C₂H₃O₂
• N₂O₄

Tags

NGSS.HS-PS1-5

A metal solution is a(n)

• colloid
• suspension
• alloy
• heterogeneous mixture