Developing Models of Simple Molecules and Extended Structures

How can the structure of a molecule or compound change the substance completely?

• It does not change the substance.

• It changes the shape.

• It changes the properties of the molecule or compound.

• It changes the volume and the mass.

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NGSS.MS-PS1-1

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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

Why are oxygen molecules different than ozone molecules even though they are made up of the same atoms.

• They have different structures.

• They have different amounts of atoms.

• They have different chemical bonds.

• All of the above answers are correct.

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NGSS.MS-PS1-1

What is a compound?

• A compound is a substance that contains more than one type of atom.

• An atom with protons, neutrons, and electrons.

• A pure substance that contains only one type of atom.

• Part of an atom.

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How can you use the Periodic Table of Elements to determine single elements from compounds?

• Look at the atomic numbers on the Periodic Table of Elements.

• Look at the atomic mass.

• Use the elements abbreviations to see if more than one element is represented in a compounds name. A compound has two or more different elements.

• Look for chemical blocks.

What is a crystal?

• A crystal is a pure substance that is a solid.

• A crystal has particles that are arranged in a specific, repeating order (molecular structure).

• A substance in which the particles are arranged in an orderly, geometric, and repeating pattern.

• All of the descriptions above describe crystals.

What is a pure substance?

• 2 or more atoms joined together.

• A sample of matter that has specific and physical properties.

• An attractive force that holds atoms together.

• A substance.

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What is a chemical bond?

• A pure substance made up of two or more different atoms.

• Two or more atoms.

• The attractive force that hold tow or more atoms together.

• It is two Hydrogen atoms.

what is sodium chloride an example of?

• molecule

• compound

• element

• atom

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NGSS.MS-PS1-1

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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