Compounds

What is the definition of compound?

• A compound is a substance made of atoms of two or more elements that are chemically combin

• A substance formed when two or more chemical elements are mixed together without any chemical reaction.
• A substance formed when two or more chemical elements are not bonded together.
• A substance formed when two or more chemical elements are physically bonded together.

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What does a chemical formula show?

• The chemical formula for a compound shows the elements that are in it.

• The shape of a molecule or compound.
• The temperature at which a molecule or compound boils.
• The color of a molecule or compound.

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NGSS.MS-PS1-1

What is the chemical formula for sand?

• N/A
• H2O
• NaCl
• SiO₂

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What does the chemical formula for sand mean?

• 2 atom of silicon for every 1 atoms of oxygen.

• Sodium chloride
• 1 atom of silicon for every 2 atoms of oxygen.

• Iron oxide

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What is the chemical formula for salt?

• C6H12O6
• CO2
• NaCl
• H2O

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NGSS.MS-PS1-1

Are the properties of Sodium and Chlorine the same when they combine to make salt? Explain.

• Only if heated
• Sometimes
• No, Sodium is a soft, bright, silver metal that floats on water. Chlorine is a poisonous green gas. Together they make salt a white non poisonous non metal.

• Yes

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NGSS.MS-PS1-2

What is the chemical formula for water?

• NaCl
• CO2
• H₂O

• H2O2

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Some compounds bond by sharing which subatomic particle?

• electrons
• photons
• neutrons
• protons

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What happens to the electrons in salt?

• NaCl

• Electrons move from the sodium atoms to the chlorine atoms. The opposite charges attract and bind the atoms tightly together. 

• Nothing

• They share protons

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NGSS.MS-PS1-1

What two elements make steel?

• Iron and carbon
• Iron and oxygen
• Aluminum and carbon
• Copper and carbon

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