Rate of Dissolving LAB

Determine which will dissolve faster:

• Stirring sugar crystals into water vs. not stirring sugar crystals into water

• Granular sugar crystals dissolved in water vs cubed sugar dissolved in water

• Granular sugar dissolved in room temperature water vs. granular sugar dissolved in hot water

• Amount of solvent (water) 100 mL vs 50 mL of water, both at room temperature

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What are the four factors which affect how quickly a substance will dissolve in a liquid?

• Temperature, Pressure, Particle Size, and Concentration

• Volume, Density, Particle Size, and Concentration

• Temperature, Volume, Density, and Solubility

• Pressure, Volume, Solubility, and Density

In what situations does sugar dissolve at a faster rate?

• When the sugar is in larger pieces

• When stirred into warm water

• When the water is still

• When added to cold tea

What general statement can you make regarding the dissolving rate of a substance when placed in hot water compared to when placed in ice cold water?

• It dissolves faster in hot water.

• It dissolves faster in ice cold water.

• The temperature does not affect the dissolving rate.

• It dissolves at the same rate in both temperatures.

Tags

NGSS.MS-PS1-4

Why would you expect a packet of sugar to dissolve more quickly in your hot tea rather than a glass of iced tea?

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which has more surface area: a sugar cube or an equal amount of loose, granular sugar?

• Sugar cube

• Loose, granular sugar

• Both have the same surface area

Which dissolved faster: the sugar cube or an equal amount of loose, granular sugar?

• Sugar cube

• Loose, granular sugar

• Both dissolved at the same rate

What general statement can you make regarding the dissolving rate of a substance and the amount of surface area exposed to the solvent?

Which dissolved faster: the sugar that was left alone in the beaker of water or the sugar that was stirred in the beaker of water?

• The sugar that was left alone

• The sugar that was stirred

• Both dissolved at the same rate

• Cannot determine

What general statement can you make regarding the dissolving rate of a substance that is stirred as opposed to being left alone?

Tags

NGSS.MS-PS3-5