Rate of dissolving

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

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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 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

Tags

NGSS.MS-PS1-2

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.

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

• True

• False

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

• True

• False

Which statement best describes the rate of dissolving?

• All substances dissolve at the same rate.

• All substances dissolve at a fast rate.

• The rate of dissolving may be fast or slow.

• Rates of dissolving are usually slow.

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

Anything that has mass and takes up space is...

• matter

• volume

• density

• mass