Fifth Grade Mixtures Questions

Chelsea is doing an experiment in which she dissolves a piece of cookie in water. She places one piece of the cookie in a jar of water. Which of the following would make the cookie dissolve slower?

• cooling the water

• crushing the cookie

• shaking the jar

• stirring the water

Carl is testing different objects to see if they dissolve if left in water for 20 minutes. Which is the only object that would dissolve in water?

• shoestring

• penny

• cube of sugar

• rock

Aarti is designing an experiment for her science class. She has four 50-milliliter (mL) containers of water at four different temperatures. She adds 15 grams of salt into each container. At which temperature will the salt dissolve the fastest?

• 7 °C

• 34 °C

• 58 °C

• 62 °C

Tags

NGSS.MS-PS1-2

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Ryan is mixing salt and water together for a fish tank. He puts several tablespoons of salt into a glass of water. Which of the following would help Ryan to dissolve the salt faster?

• stirring the water

• using larger salt crystals

• decreasing the temperature of the water

• decreasing the surface area of the sugar

Julie wants to add some sugar to her hot coffee. She has a choice between solid sugar cubes and regular grain sugar. Which statement BEST explains the correct choice?

• The sugar cubes would dissolve faster because they have more mass.

• The grain sugar would dissolve faster because it has more surface area.

• The sugar cubes would dissolve faster because they don’t need to be stirred.

• The grain sugar would dissolve faster because it is a cooler temperature.

Lindsay is adding salt to water in a pot. What can she do to make the salt dissolve faster?

• Cool the water in the refrigerator.

• Heat the pot of water on the stove.

• Cover the pot so no evaporation can occur.

• Be careful not to stir the water and move the salt.

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(Open the picture for the full question)

What should Meta and Aliya expect to observe after those five minutes?

• Both the salt and sand dissolved in the water.

• Both the salt and sand settled to the bottom of the jar.

• The salt settled to the bottom of the jar, and the sand dissolved in the water.

• The salt dissolved in the water, and the sand settled to the bottom of the jar.

Tags

NGSS.MS-PS1-2

While at the beach, Ravi takes a shovelful of sand and adds it to a bucket of water. He stirs together the sand and water for 2 minutes. He gets tired and he rests for 5 minutes. After 5 minutes, what happens to the sand?

• It disappears from the water.

• It floats to the top of the bucket.

• It remains dissolved in the water.

• It settles to the bottom of the bucket.

Jack is helping his Aunt Starr on an archeological dig. His aunt gives him a bucket containing sand, rocks, and artifacts. What is the best way for Jack to separate the sand from the other materials?

• Use water to dissolve the sand.

• Use a screen to filter out the sand.

• Heat up the sand until it melts.

• Boil the sand with water until it evaporates.

George’s science teacher has a mixture of table salt and iron filings. Which of the following is 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.