#5 Surface Area & Thermal Energy

You want to make chocolate milk using Hershey's syrup. How could you speed up the rate of the syrup dissolving in your milk?

• Put the syrup in the fridge to cool before putting it in the milk

• Put the syrup in the milk and let it sit

• Increase the amount of syrup you put into the milk

• Warm up the syrup before putting it into the milk

Tags

NGSS.MS-PS1-4

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

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

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

What combination would dissolve a solid solute the fastest?

• Large pieces, High temperature, No stirring

• Smaller pieces No heat, No stirring

• Large sugar cube, No heat, No stirring

• Small pieces, High temperature, and Stirring

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

This type of thermal energy transfer can take place in solids, liquids, & gases when two objects are touching.

• conduction

• convection

• radiation

This type of thermal energy transfer can take place in fluids (liquids & gases). Rising of warmer fluid and sinking of cooler fluid forms a current.

• conduction

• convection

• radiation

The thermal energy transfer being shown in this image is...

• conduction

• convection

• radiation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The thermal energy transfer being shown in this image is...

• conduction

• convection

• radiation