Solubility and the Rate of Dissolving

Which of the following statements is true about how using smaller salt crystals would affect the rate of making a salt solution in water?

• Smaller crystals increase the surface area and slow down dissolving.

• Smaller crystals decrease the surface area and speed up dissolving.

• Smaller crystals increase the surface area and speed up dissolving.

• Smaller crystals decrease the surface area and slow down dissolving.

What combination would dissolve a solid solute the fastest?

• high temperature, no stirring

• no heat, no stirring

• sugar cube, no heat

• high temperature, stirring

Tags

NGSS.MS-PS1-4

Which of the following actions will NOT

increase the rate of dissolution

(dissolving) for solids?

• Stirring the solution

• Decreasing the temperature

• Increasing the surface area of the

  solute

• Increasing the temperature

John has three cups of sugar particles. Cup 1 has large sugar particles, Cup 2 has medium-sized particles, and Cup 3 has small sugar particles. If John pours each cup in water, which cup of sugar particles will dissolve the fastest?

• Cup 1 will dissolve the fastest.

• Cup 2 will dissolve the fastest.

• Cup 3 will dissolve the fastest.

• They will dissolve at the same rate.

Jackson is making dinner and is trying to dissolve salt into a pot of water. The salt is dissolving slowly. What should Jackson do to speed up the rate of dissolving?

• He should put larger salt particles in the water.

• He should heat the water to a higher temperature.

• He should completely stop stirring the pot of water.

• He should slow down the speed he is stirring the pot.

Tags

NGSS.MS-PS1-4

Stirring the solution increases the rate of dissolution (rate of dissolving).

• True

• False

Tags

NGSS.MS-PS2-2

The smaller the particle size the faster the rate of dissolution (rate of dissolving).

• True

• False

Which will dissolve faster? Crushed table salt or a cube of table salt. Assume they have an equal mass.

• crushed table salt

• crystal of table salt

Select the 3 properties that affect the rate of dissolving materials

• surface area

• volume

• temperature

• texture

• stirring

How does cold water affect the speed of dissolving?

• Cold water slows down dissolving.

• Cold water speeds up dissolving.

• Cold water has no effect on dissolving.

• Cold water has no effect on dissolving.

Tags

NGSS.MS-PS1-4