VST 2 Review

Mindy found two seashells when she went to the beach. They appear to be almost the same size, but they have different shapes. How could she figure out if their volume is the same?

• weigh each one on a scale to see which is heaviest

• take the temperature of each one to see which has the most heat

• measure the length of each one with a measuring tape to see which is longest

• drop each one in a beaker of water to see which raises the water level to the highest level

The two objects shown below are sitting in the same room. They are the same size. One floats in water and the other sinks in water.Which of the following properties of the objects will most likely be different?

• mass

• length

• volume

• temperature

Tanya is measuring two solids on a balance scale. What must be true about the two objects shown above?

• Both objects have the same mass.

• Both objects have the same volume.

• Object A has more mass than object B.

• Object B has more mass than object A.

Roger uses sugar cubes to sweeten his tea. He wonders whether stirring his tea will make the sugar cube dissolve faster or slower. If Roger 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.

Tags

NGSS.MS-PS3-4

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

• sand

• sugar

• table salt

• baking soda

Carly has a thick ten-kilogram block of soap and a thin ten-kilogram sheet of the same kind of soap. Which answer best explains which will dissolve first when they are both placed underwater?

• The sheet will dissolve first because it has more surface area.

• The sheet will dissolve first because it has less mass than the block.

• The block and the sheet will dissolve at the same pace because they weight the same.

• the block and the sheet will dissolve at the same pace because they take up the same space.

Four friends are challenged to find the fastest way to dissolve one gram (g) of sugar in 250 milliliters (ml) of water. The table below describes each person's strategy.

Which of the following most likely identifies which sugar will dissolve the fastest and slowest?

• Marco's sugar will dissolve the fastest and Joshua's sugar will dissolve the slowest.

• Marco's sugar will dissolve the fastest and Martha's sugar will dissolve the slowest.

• Daisy's sugar will dissolve the fastest and Martha's sugar will dissolve the slowest.

• Daisy's sugar will dissolve the fastest and Joshua's sugar will dissolve the slowest.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Vanessa wants to know what effect stirring will have on the rate at which a sugar cube will dissolve. Which answer best explains the effect that stirring will have?

• Stirring makes the sugar move around, and it dissolves more slowly because it is not staying still.

• The sugar will dissolve more slowly because the movement of the water makes it stick together.

• The sugar dissolves more quickly because the motion of the spoon creates heat, which melts the sugar.

• When the sugar is stirred, more surface area will come into contact with the water, so the sugar dissolves more quickly.

Ebert'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.

Laisha 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 glass beads are larger so she could pour the beads through a strainer and the iron beads will separate.