Chemistry Recap

How do you express 2 Hydrogen atoms in chemical formula?

• 2H

• H₂

• H

• H²

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

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the central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

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an atom with atomic number 6 would have how many protons 

• 6
• 12
• 3
• cannot be determined 

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NGSS.MS-PS1-1

A particle that moves around the nucleus is a(n)...

• Proton
• Neutron
• Electron
• Quark

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What charge does an atom have when it GAINS electrons?

• Positive

• Negative

• Neutral

What is the name of the solid that forms after some solutions react chemically?

• Colloid

• Precipitate

• Solid

• Mixture

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NGSS.MS-PS1-5

Which is an example of a chemical reaction?

• Ice melting

• wood burning

• salt stirred into water

• rain falling

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NGSS.MS-PS1-2

Using the following chemical reaction
Hydrogen + Oxygen --> water
Identify the reactant(s).

• Hydrogen and Oxygen
• water

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NGSS.MS-PS1-2

Which of the following is NOT a chemical reaction?

• burning a marshmallow in a campfire.
• a campfire
• acid rain turning a copper roof green.
• Dissolving red Koolaid in water.

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NGSS.MS-PS1-2