Simple Molecules and Extended Structures

What is the difference between a molecule and a compound?

• One is radioactive.

• Molecules are made of the same atoms, while compounds are made up of two or more different types of atoms.

• They are both made of only a single atom.

• One makes you up and the other makes the thing that make you up.

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NGSS.MS-PS1-1

What is the Chemical 'Formula' of this molecule?

• H2

• O

• HO

• H2O

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Polyvinyl chloride (PVC) is a polymer used to make water pipes and other products. Polymer molecules are made of groups of atoms that repeat many times in long chains as shown in the formula.

Which circle, left to right, shows the repeating group of atoms that forms PVC?

• first circle

• second circle

• third circle

• fourth circle

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NGSS.MS-PS1-1

Salt and diamond are examples of extended structures.

• True

• False

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Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 0

• 1

• 2

• 3

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How many 'types of elements' are there?

• 3

• 2

• 1

• 0

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What is the Chemical 'Symbol' here?

• Oxygen

• 8

• 15.99

• O

Which list of formulas represents compounds, only?

• NaCl, H₂O, CO

• H₂, N₂, O₂

• H₂, Ne, NaCl

• MgO, NaCl, O₂

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NGSS.MS-PS1-1

What happens when an atom makes a connection with another atom?

• Their increase in size makes them visible to the human eye.

• The atoms create a more complex particle called a molecule.

• The atoms become a single atom depending on which one is stronger.

• They undergo a process that causes the to make copies of themselves.

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NGSS.MS-PS1-5

Why do scientists use models to portray molecules?

• Scientists have no other way to see molecules

• It is the only way they can provide proof for their work.

• It makes important aspects of the molecule easier to see.

• It is the only way they can figure out how to combine atoms

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