Unit 6 Lesson 4-6: Pure sub. and mixtures, changes of state

Which of these substances is a homogeneous mixture?

• Salad dressing

• Maple syrup

• Table salt

• Pure water

What substance is only made of a single type of atom?

• Compound

• Molecule

• Element

• Mixture

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NGSS.MS-PS1-1

How are elements and compounds similar?

• They are both found on the periodic table.

• Physical changes will break them both down.

• They are both pure substances.

• They are both made of different kind of atoms.

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NGSS.MS-PS1-1

Here, a magnet separates iron from the mixture of iron & sand. Which statement is true?

• The properties of a compound are different from the properties of its elements.

• The properties of a mixture are different from the properties of its parts.

• The parts of a mixture keep their own properties.

• The elements in a compound keep their own properties.

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Which statement about mixtures is correct?

• homogeneous colloid: fog, homogeneous suspension: oil & vinegar salad dressing

• homogeneous solution: colored water, homogeneous suspension: sandy water

• heterogeneous colloid: gelatin dessert with fruit chunks, homogeneous solution: salt water

• heterogeneous solution: salt water, homogeneous solution: brass

Janae is making a model to show atoms of solid water, liquid water and gaseous water. How should her three models differ?

• The mass of the atoms should vary depend on the state.

• The identity of the atoms should vary depending on the state.

• The motion of the atoms should vary depending on the state.

• The size of the atoms should vary depending on the state.

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NGSS.MS-PS1-4

Which state of matter will take both the volume and shape of the container that holds it?

• solid

• liquid

• gas

• ice

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During deposition, water vapor changes directly into ice. Frost occurs by this process. If you had to model these water particles before and after deposition, how would they compare?

• Before deposition, the particles move quickly in all directions; after deposition, they vibrate in place.

• Before deposition, the particles vibrate in place; after deposition, they move quickly .

• Before deposition, the particles slide past each other; after deposition, they vibrate in place.

• Before deposition, the particles vibrate in place; after deposition, they slide past each other.

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When you freeze water in an ice cube tray, why does the ice cube stay the shape of a cube when you take it out the tray?

• The water particles grow bigger to fill the space.

• The water particles stop moving completely.

• The water particles become locked in place.

• The particles can only slip past one another.

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NGSS.MS-PS1-4

The picture shows the particles in three states of matter. What do each of the states of matter have in common?

• The particles are locked into position.

• The particles take the shape of their containers.

• The particles have the same volume in each container.

• The particles in each are in constant motion.

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