Modeling Matter

In Solving Dissolving, we read about Maya who was wondering why the sugar disappeared when it was mixed with water. They decided to sit the cup of sugar water in the window. After a dew days, what did Maya observe and why?

• Maya observed nothing left in the cup. All the water and sugar evaporated.

• Maya observed water still in the cup but no sugar. The sugar evaporated.

• Maya observed small grains of sugar left in the cup. The water evaporated.

• Maya observed sugar and water still in the cup. Nothing evaporated.

Answer explanation

Evaporation is one way to separate a mixture.

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NGSS.MS-PS1-2

Select all that apply. Which are too small to be seen with your own eyes?

• Particles

• Substances

• Atoms

• Molecules

• Mixtures

Answer explanation

Particles and atoms are the same thing. They are too small to be seen with our own eyes because they are at the nanoscale level. Molecules are combinations of 2 or more atoms or particles, but are still too small to be seen with our own eyes. We can see substances like water and salt with our own eyes because there are millions of molecules that compose that substance. Mixtures are combinations of substances so we can see those with our own eyes as well.

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NGSS.MS-PS1-1

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Select all that apply. How can you remove DISSOLVED solids from mixtures such as sugar water or sea water?

• Filter

• Evaporation

• Creating another mixture and combining it

• Boiling

Answer explanation

They weren't asking you to separate the salt from the water in the sea water. They were asking how to separate a solid substance that had dissolved. Think back to the book Solving Dissolving. They put the sugar water in a cup and put it in the window for it to evaporate. That left behind sugar. Something else they could have done was boil the sugar water and that would have left behind the sugar as well just as evaporation did.

True or False: Observable properties of matter and properties we can see with our own eyes.

• True

• False

Answer explanation

Observable means you can physically see or do. Observable properties of matter include taste, smell, touch, and texture.

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What does it mean for something to be soluble?

• It evaporates.

• It creates sediments.

• It separates.

• It dissolves.

Answer explanation

For something to be soluble, it must dissolve. In our Flavor Ingredient Test in class, the citric acid and sugar were soluble while the pepper and cumin were not.

Does this picture represent an atom of Molecule?

• Atom

• Molecule

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NGSS.MS-PS1-1

A glass of saltwater is sitting on a table. Which of the following best describes the matter in this saltwater?

• It is made up of only one type of molecule.

• It is not made up of any molecules.

• It is made up of more than one type of molecule.

• It is not made up of matter.

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NGSS.MS-PS1-1

The ability of a substance to dissolve is called...

• malleability

• ductility

• solubility

• conducticity

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NGSS.MS-PS1-2

Hailey stirred some sugar into a pitcher of lemonade.

   
What happened to the sugar? 

• The sugar floated to the top surface

• The sugar disappeared after it was stirred.

• The sugar dissolved in the lemonade

• The sugar all settled to the bottom of the pitcher

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NGSS.MS-PS1-2

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When you mix a solid into a liquid until it disappears, we say that it has __________.

• evaporated

• dissolved

• transferred

• melted

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