Chemical Substances and Extended Structures

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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What is one way scientists tell atoms apart when creating models since they all appear as round spheres?

• They use different colors.

• The use different shapes.

• They assign each atom a number.

• They limit the number of atoms they work with to eight.

A diamond is a crystal that:

• is made of one element.

• is made of multiple elements.

• extends forever.

• has a spherical structure.

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How do molecules in a crystal arrange themselves?

• Crystals of molecules always form in a spherical shape.

• Crystals of molecules form in a regular, repeating pattern.

• Crystals of molecules form in an irregular, diamond-like pattern.

• Crystals of molecules always form in a shape similar to a snowflake.

How is carbon able to form both graphite and diamond?

• Diamond is a carbon polymer and graphite is a carbon crystal.

• Carbon can be arranged in different atomic-level structures.

• Carbon bonds with different atoms to form both graphite and diamond.

• Graphite's subunits have an irregular repeating pattern, but diamond subunits do not.

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Why is graphite a good writing tool, whereas diamond is not?

• Graphite has hexagonal sheets which are weakly connected to each other, whereas diamond has a strong cubic structure.

• Graphite has hexagonal sheets which are strongly connected to each other, whereas diamond has a weak cubic structure.

• Graphite has a weak cubic structure, whereas diamond has hexagonal sheets which are strongly connected to each other.

• Graphite has a strong cubic structure, whereas diamond has hexagonal sheets which are weakly connected to each other.

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Why do snowflakes have a hexagonal shape?

• There are six atoms in a water molecule.

• Crystals typically form in repeating patterns of six.

• It is very difficult for a liquid to freeze into any other structure.

• Their atomic-level structure is made up of crystals with six sides.

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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what is sodium chloride an example of?

• molecule

• compound

• element

• atom

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Molecules are atoms "joined" together by...

• chemical bonds/attractive forces.

• sticks/circles/spheres.

• super glue!

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