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Jason has a mixed container of iron pellets, foam pellets, glass pellets, and salt pellets. He needs to do the following things to separate these solids: A. Add water to the container and stir to dissolve the salt. B. Heat the water until it evaporates and leaves the salt. C. Remove the iron pellets with a magnet. D. Collect the floating foam pellets and the glass ones that have stuck to the bottom. Which answer choice puts these steps in the correct order?

• A, C, B, D

• C, A, D, B

• D, A, B, C

• B, D, C, A

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Imagine a thick ten-kilogram block of soap and a thin ten-kilogram sheet of soap. Which answer correctly 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 will dissolve first because it is less spread out than the sheet.

• The sheet and the block weigh the same, so they will take the same amount of time to dissolve.

Both cookies and gelatin desserts are solids although their textures are very different. What do they have in common that makes them solids?

• They both may be eaten.

• They both keep their own shape.

• They both can move around in a container.

• They both are made of solids such as sugar.

Which statement best represents a gas? (SC.8.P.8.1.)

• Particles move more slowly and are farther apart.

• Particles move more slowly and are closer together.

• Particles move more quickly and are farther apart.

• Particles move more quickly and are closer together.

Tags

NGSS.MS-PS1-4

Which statement best identifies the movement of the particles in a liquid? (SC.8.P.8.1.)

• The particles of a liquid move freely.

• The particles of a liquid slide past each other.

• The particles of a liquid vibrate and barely move.

• The particles of a liquid do not move at all.

Tags

NGSS.MS-PS1-4

Which statement best identifies a solid? (SC.8.P.8.1.)

• Particles barely move and are tightly packed.

• Particles barely move and are farther apart.

• Particles move more quickly and are farther apart.

• Particles move more quickly and are tightly packed.

1. Which statement best identifies which of these models is a liquid? (SC.8.P.8.1)

• Diagram A is a liquid, because its particles move the slowest and are tightly packed.

• Diagram B is a liquid, because its particles move at a medium speed, and are sliding past each other.

  C.

• Diagram C is a liquid, because its particles move the fastest and bounce all over the place.

• Diagram A and B are both liquids, because the particles are always touching.

How does the picture relate to the particles in a solid?

• The cars are driving fast and switching lanes like the particles in a solid.

• The cars are sliding past each other while driving the speed limit like the particles in a solid.

• The cars are moving so fast you cannot even see them like the particles in a solid.

• The cars are barely moving like the particles in a solid.

Shelby filled three empty soda bottles with 5 g of steel wool, a material used for cleaning that also rusts quickly. She added 100 mL of water to each bottle and then resealed the bottle. She placed each bottle in one of three different locations: in a refrigerator at 3 °C, in a room at 25 °C, and in a warm kitchen at 30 °C. She observed the bottles every day for a week and recorded the amount of rust that formed on the steel wool. Which research question does this experiment best investigate?

• Does a gas form when steel wool rusts?

• Does the temperature in a room vary widely over time?

• Does the amount of water effect how quickly steel wool rusts?

• Does temperature affect the amount of rust that forms on steel wool?

An atom's atomic number of an element is the number of protons in the nucleus of one of its atoms.

• True

• False

Tags

NGSS.MS-PS1-1