Changes in Matter Formative

Four groups of students were given salt to dissolve in water. Each group used the same amount of water. They use a timer to observe how long it took to completely dissolve the salt. They recorded their results in the table. Which of the following would BEST explain these results?

• Group 4 stirred the salt and water; the other groups did not.

• Group 4 used large rock salt; the other groups crushed their salt sample

• Group 4 used cold water; the other groups used warm water

• Group 4 left the salt and water still; the other groups shook the mixture

Tags

NGSS.MS-PS1-2

Anthony added 60 g of sugar to 240 mL of water. Which method will cause the sugar to dissolve at the slowest rate?

• Put ice in it.

• Stir it.

• Shake it.

• Heat it up.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Mark gathered some everyday substances. He plans to write the properties underneath

each picture. Which of Mark’s choices will dissolve most quickly in water?

• sand

• soil

• sugar

• oil

Tags

NGSS.MS-PS1-2

Epsom salt is a product that may be added to a bath to help ease sore muscles. A scientist tested two forms of Epsom salts under different conditions to see which would dissolve the fastest. The test information was recorded in the table below. Which sample would you expect to dissolve the fastest?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-2

Which of the following is not a factor in speeding up the dissolving process?

• Increasing the temperature

• Decreasing the temperature

• stirring/shaking

• Size of the particles

Students make a mixture of pebbles, salt, and iron shavings. Which procedure could they use to separate the parts of this mixture?

• Use water to dissolve both the salt and iron shavings, and use a sieve to separate the pebbles.

• Use a sieve to separate the pebbles and a magnet to separate the iron shavings from the salt.

• Add water and let it evaporate to remove the iron shavings, then use a filter to separate the pebbles and salt.

• Add heat to the mixture to melt the salt, then use a magnet to separate the iron shavings from the pebbles.

Tags

NGSS.MS-ETS1-1

The diagram below shows a mixture being separated.

Why can filter paper be used to separate the parts of this mixture?

• Some of the particles are too big to pass through the sieve

• Some of the particles make compounds when they move through the sieve

• Some of the particles will evaporate when they move through the sieve

• Some of the particles will gain floating properties after passing through the sieve

Tags

NGSS.MS-PS1-2

Kendall’s teacher has asked the class to separate a mixture of sand and pepper. Which process should the class use?

• Heat the mixture over the flame

• Use a magnet to attract the pepper

• Add water to the mixture, stir to dissolve the sand, and then filter the solution

• Use a sieve to separate larger grains from smaller grains

What type of mixture occurs when two materials mix evenly and do not settle?

• Solution

• Compound

• sugar

• Solute

What is the BEST way to separate a mixture of pencil shavings and paper clips?

• Spread the mixture out on a table and sort by hand.

• Use tweezers to pick out the paper clips

• Use a magnet to attract the paper clips

• Dissolve the pencil shavings in water