Solutions

How many moles of ions are produced by the dissociation of 31 mol Al₂(CO₃)₃?

• 6 mol
• 155 mol
• 341 mol
• 62 mol

Raising solvent temperature causes solvent-solute collisions to become

• more frequent and less energetic
• more frequent and more energetic
• less frequent and less energetic
• less frequent and more energetic

Tags

NGSS.MS-PS1-4

Which of the following will dissolve most rapidly?

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

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Increasing the surface area of the solute

• increases the rate of dissolution
• increases solubility
• decreases the rate of dissolution
• has no effect on the rate of dissolution

Which of the following expresses concentration?

• moles of solute per liter of solution
• molarity
• molality
• All of these

Water in air is an example of which solute-solvent combination?

• gas-liquid
• liquid-liquid
• gas-gas
• liquid-gas

According to saturation curves shown in the figure, which of the following solutions is supersaturated?

• 80 g of NaCH₃COO in 100 g of water at 40^oC
• 140 g of NaCH₃COO in 100 g of water at 80^oC
• 40 g of NaCH₃COO in 100 g of water at 40^oC
• 80 g of NaCH₃COO in 200 g of water at 40^oC

A solution containing 35 g of Li₂SO₄ dissolved in 100 g of water is heated from 10^oC to 90^oC.  According to information in the figure, this temperature change would reslut in

• no change in Li₂SO₄ concentration
• an additional 5 g of Li₂SO₄ in solution
• an additional 30 g of Li₂SO₄ in solution
• 5 g of Li₂SO₄ precipitate

How many moles of ions are produced by the dissociation of 12 mol of MgCl₂?

• 4 mol
• 24 mol
• 36 mol
• 0 mol

Which of the following will dissolve most slowly?

• large salt crystals in stirred water
• large salt crystals in unstirred water
• small salt crystals in stirred water
• small salt crystals in unstirred water