Unit 2 Lesson 4 Quiz

Which one of these is a compound?

• Ammonia (NH₃)

• Carbon (C)

• Uranium (U)

• Chlorine (Cl₂)

If you were to look at grains of table salt (Sodium Chloride, NaCl) with a powerful microscope, you would see that each grain is a little cube. Why are salt grains cubes?

• The atoms are shaped like a cube so that is why.

• All extended structures are shaped like cubes.

• The arrangement of the extended structure of NaCl is arranged in a cubical pattern.

• A molecule of NaCl contains eight atoms, each one of corners is a cube,

An element is...

• a single atom that has the properties of a solid, liquid, and gas.

• a substance that can't be broken down or separated into simpler substances by chemical change.

• the single smallest particle in the universe

• I don't know.

True or False Some molecules can also be compounds?

• True

• False

Extended structures are...

• made up a repeating sub-unit of atoms.

• lots of atoms.

• a single atoms that isn't in a set pattern.