A.P.E.S. Unit 2

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: Add water to the container and stir to dissolve the salt. Heat the water until it evaporates and leaves the salt. Remove the iron pellets with a magnet. 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-PS1-2

NGSS.MS-PS1-4

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.

Ellen has a mixture of sand and gravel. She places the mixture in a container and shakes the container. The picture below shows the mixture after it was shaken.

Which property best explains why the sand and gravel separated into two groups?

• color

• shape

• weight

• particle size

Dr. Morgan is using evaporation to separate salt from water. What happens during evaporation?

• A substance changes from a gas to a liquid.

• A substance changes from a liquid to a gas.

• A substance changes from a liquid to a solid.

• A substance changes from a solid to a liquid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A container holds a mixture of glass shards and iron filings. What is the best way to separate the glass shards from the iron filings?

• Use a magnet.

• Heat the mixture.

• Sort them by size.

• Separate them by shape.

The following illustration shows a tool that can be used to separate elements of certain mixtures.

This tool can separate what type of mixture?

• a solution, such as salt water

• a mixture of particles with different densities

• a mixture of particles of different sizes, such as seashells and sand

• a mixture of magnetic and nonmagnetic items, such as steel and aluminum cans

What is physical change?

• A change to matter, in which no new kinds of matter are formed

• Solid, liquids, or a gas

• Arianna and Sara mixed together

• Bhyanie mixed with salad

Tags

NGSS.MS-PS1-4

Which of the following best describes the concept of biodiversity in an ecosystem?

• A) The variety of different species in a given area.

• B) The number of individual organisms in a population.

• C) The genetic variation within a single species.

• D) The total biomass of all organisms in an ecosystem.

Tags

NGSS.MS-LS2-5

In an experiment to measure the effect of light on plant growth, which of the following is the independent variable?

• A) The amount of water given to the plants.

• B) The type of soil used.

• C) The amount of light the plants receive.

• D) The height of the plants.

Tags

NGSS.MS-LS1-5

Which of the following is a real-world application of the law of conservation of mass?

• A) A car engine converting gasoline into energy.

• B) A plant converting sunlight into chemical energy through photosynthesis.

• C) A chemical reaction in a closed container where the mass of reactants equals the mass of products.

• D) Water evaporating from a lake into the atmosphere.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5