SC.5.P.8.3 Form A

1. George’s science teacher has a mixture of table salt and iron filings. Which of the following would be the best way to separate the salt and the iron filings?

• use a magnet to pull the iron filings from the salt
• add food coloring to the mixture to make the salt change color
• pour them into a beaker of water and see if the iron filings float
• heat up the mixture to see if the salt or the iron filings will burn away

2. Carrie has a container that contains thousands of mixed glass beads and iron beads of different shapes and sizes.Which of the following is the best way to separate them?

• The glass beads will float, so she could add water to the container and the glass will float to the top.
• The iron beads are magnetic, so she could separate the glass from the iron with a strong magnet.
• The iron beads might be heavier, so she could shake the container until the iron beads settle to the bottom.
• The iron beads are smaller, so she could pour the beads through a strainer and the glass beads will separate.

3. Imagine you have a bucket of saltwater. Which of the following would be the best way to remove the water so that you’re left with only salt?

• Stir the saltwater for a long time. The salt will form a crystal.
• Leave the saltwater to sit for a long time. The salt will settle to the bottom.
• Boil the saltwater. The water will evaporate and only the salt will remain.
• Freeze the saltwater. The water will sink to the bottom and the salt will rise to the top.

4. Abdul uses sugar cubes to sweeten his tea. He wonders whether stirring his tea will make the sugar cube dissolve faster or slower.If Abdul stirs his tea, what effect does it have on the rate at which the sugar cube dissolves?

• The rate that the sugar cube dissolves will speed up.
• The rate that the sugar cube dissolves will slow down.
• The rate that the sugar cube dissolves will remain the same.
• The rate that the sugar cube dissolves will slow down and then stop.

5. Which of the following solids will not dissolve in boiling water?

• baking soda
• sand
• sugar
• table salt