Mixtures and Solutions

A fifth grade class has collected empty cans for recycling. The class has several large bins with aluminum and steel cans, all mixed together. The two types of cans must be separated. Which of the following techniques could the students us to separate the two types?

• Place the cans in water and the aluminum cans will float.

• Use a magnet to find and remove the steel cans.

• Crush the cans to make them easier to carry.

• Test the cans for their ability to conduct electricity.

A mixture of peanuts and chocolate chips would have what property? The mixture would -

• Have a salty and sweet flavor

• Change from a solid to a liquid

• Have less mass than the ingredients

• Become cooler while being mixed

Tags

NGSS.MS-PS1-2

Which of the following, if added to water, would change its' shape?

• Glass

• Salt

• Sand

• Wood

A tablespoon of a substance is added to warm water and stirred. The result was that the substance could no longer be seen. We can conclude from the results that the substance ______________ in the water.

Tags

NGSS.MS-PS1-2

Students were asked to separate a mixture of sand and salt. One group decides to put the mixture into a beaker of water first. Which of the following should they do next to separate out the sand and salt?

• Use a magnet to pull the sand from the water, then freeze the water.

• Let the water stand still until the sand settles to the bottom and the salt floats to the top.

• Boil the water from the sand and collect the vapor, which will have the salt.

• Pour the water through filter paper to remove the sand, then evaporate the water.

Sugar was added to water and stirred until it completely dissolved. Which of the following describes what happened to the sugar?

• The mass of the sugar decreased.

• The sugar disappeared and no longer exists.

• The sugar is evenly distributed in the water.

• The crystals of sugar have entered the atmosphere.

Tags

NGSS.MS-PS1-2

What property of water changes after creating a solution of lemon juice and water?

• shape

• temperature

• taste

• state

Tags

NGSS.MS-PS1-2

A teacher places a mixture in a cooking pot and brings the mixture to a boil to separate. Which of the following statements best describes the mixture?

• The mixture is a solution such as salt water.

• The mixture is a solution such as sand and iron filings.

• The mixture consists of particles of different sizes.

• The mixture consists of solid particles with different densities.

Tags

NGSS.MS-PS3-4

A group of students are investigating mixtures by combining foam beads, plastic beads and water in a beaker. Which of the following describes how the students could separate the mixture?

• 1. Use a magnet to attract the plastic beads.
  2. Use a small collecting net to scoop the foam beads out of the water.

• 1. Use a small collecting net to scoop the foam beads out of the water.
  2. Pour the water and plastic beads through a strainer.

• 1. Add thermal energy to evaporate the water.
  2. Use a magnet to separate the beads.

• 1. Stir the components of the mixture.
  2. Pour the mixture through a strainer to separate the beads from the water.

Students begin to separate a mixture of gravel and salt by putting the mixture into a beaker of water. Which of the following should the students do next to separate the gravel and salt?

• Boil the mixture to separate the gravel and collect the water vapor with a lid which will have the salt.

• Pour the water through a strainer to remove the gravel and then evaporate the water to get the salt.

• Use a magnet to pull the gravel from the water and then freeze the water to separate the salt from the water.

• Let the mixture sit still until the gravel settles to the bottom and the salt floats.