S C 5 P 8 3

Kayla wants to know if a sugar cube in a bowl of water will dissolve more quickly if it is stirred with a spoon than if it is left alone. Which answer 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.

If two objects balance like the ones shown below, what must be true?

• Object A has more mass than object B.

• Both objects have the same mass.

• Object A has more volume than object B.

• Both objects have the same volume.

Tags

NGSS.MS-PS2-4

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

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.

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.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Sam drops a sugar cube weighing one gram in a cup of cold water and lets it sit until the sugar cube dissolves. Malcolm adds one gram of powdered sugar to a cup of hot water and stirs it with a spoon. Rosa adds a one-gram packet of sugar granules to a cup of cold water and stirs it with a spoon. Angela adds a sugar crystal weighing one gram to a cup of hot water and does not stir it. Whose sugar is most likely to dissolve the fastest, and whose is slowest?

• Malcolm's sugar dissolves fastest, and Sam's dissolves slowest.

• Rosa's sugar dissolves fastest, and Malcolm's dissolves slowest.

• Sam's sugar dissolves fastest, and Angela's dissolves slowest.

• Angela's sugar dissolves fastest, and Rosa's dissolves slowest.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Janice found two sea shells 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.

• Fill each one with water to see which will hold the most.

• Drop each one in a beaker of water to see which raises the water level the most.

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

The two objects shown are the same size. However, one object is made of wood, and the other object is made of plastic. Which of the following properties of the objects will be the same?

• mass

• texture

• volume

• weight

Susan blew up a balloon until it was completely full and as big as a soccer ball. Which of the following correctly describes the air inside the balloon?

• The air is a gas that cannot be compressed by any means.

• The air is a gas that always forms a round shape when compressed

• The air is a gas that expands to evenly fill the space inside the balloon.

• The air is a gas that will flow evenly and steadily from inside the balloon if punctured.

Dan brought some chocolate chips in a plastic container with his lunch one day. He decided to save them and eat them while he waited for the bus after school. All afternoon his lunch bag sat on the warm windowsill in his classroom. When he finally took the container out after school, the chocolate chips had turned into a hard chunk of chocolate shaped like the bottom of the container. What happened to his chocolate chips?

• They started as a solid, melted, and then became solid again

• They changed from a solid to a gas before becoming solid once again.

• They were a cool solid to start, then became a warm solid before cooling again.

• They went from being a hard solid to a gas, a liquid, and then to a hard solid again.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4