Unit 2: Matter

What are 2 examples of chemical changes? Choose all correct answers.

• Combustion

• Rusting

• Chopping

• Tearing

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NGSS.MS-PS1-2

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Which one is an example of a physical change?

• Ice melting

• Cake baking

• Banana rotting

• Metal rusting

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NGSS.MS-PS1-4

What is the main difference between a physical change and a chemical change?

• Chemical changes create new substances

• Physical changes create new substances

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NGSS.MS-PS1-2

What are the 4 phases of matter? Choose all correct answers.

• Solid

• Liquid

• Gas

• Plasma

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NGSS.MS-PS1-4

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Which phase has the least amount of energy?

• Solid

• Liquid

• Gas

• Plasma

What is an element?

• A compound of molecules of different structure

• A pure substance that can't be broken down

Look at this current model of the atom. What is the name of this structure?

• Bohr's model

• Dalton's model

• Electron cloud model

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NGSS.MS-PS1-1

What is found in the center (nucleus) of the electron cloud model?

• Protons

• Electrons

• Protons and neutrons

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NGSS.MS-PS1-1

What is found orbiting around the outer edges of the electron cloud model?

• Protons

• Electrons

• Neutrons

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NGSS.MS-PS1-1

Which pH would be considered slightlly acidic?

• 1

• 4

• 9

• 14