Chemistry Solutions

How can you increase the rate of dissolution of a solute in a solvent?

• Adding more solvent to the solution

• Using a solute with a higher molecular weight

• Decreasing the temperature of the solvent

• By increasing the temperature of the solvent, stirring/agitating the solution, decreasing the particle size of the solute, or increasing the surface area of the solute.

In the above picture, a powder is about to be poured into the liquid. Which of the following should be done to make this powder dissolve faster?

• stir the powder in the liquid

• freeze the mixture

• add more powder to the liquid

• store the mixture in a dark place

How many grams of K₂Cr₂O₇, are soluble in 100 g of water at 95 ºC?

• 83 grams

• 75 grams

• 40 grams

• 12 grams

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which solute is the most soluble at 10 ⁰C?

• KI

• KClO₃

• NH₄Cl

• NH₃

Tags

NGSS.MS-PS1-2

When 20 grams of potassium chlorate, KClO₃, is dissolved in 100 grams of water at 80 ºC, the solution can be correctly described as:

• supersaturated

• saturated

• unsaturated

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What is it about the water molecule that makes it a great solvent?

• water demonstrates polarity; a partial charge on each side of the molecule

• due to its molecular formula

• it has a liner molecular shape

• due to it's non-polar molecular structure

What is the molarity of 4 g of NaCl (MM=58.45) in 3,800 mL of solution?

• 0.018 M

• 0.0011 M

• 1.052 M

• 0.062 M

How many grams of solute are dissolved in 125.0 mL of 5.00 M NaCl (MM = 58.45)?

• 0.625 g NaCl

• 625 g NaCl

• 36.5 g NaCl

• 0.04 mol NaCl

Tags

NGSS.HS-PS1-7

Which of the following would be classified as an electrolyte in aqueous solution?

• Na₂CO₃

• H₂SO₄

• HF

• all of these

How many mL of 10.8M HCl are required to make 100.0 mL of 3.00M acid?

• 27.8 mL

• 27.78 mL

• 2.8 mL

• 278 mL