Elements and Substances

What are molecules?

• Molecules are combinations of two or more atoms.

• Molecules are the parts that make up atoms

• Molecules are the gaseous parts of atoms

• Molecules are atoms that have a positive charge

Pure substances are divided into two categories

• elements and mixtures

• elements and compounds

• compounds and mixtures

• compounds and pure substances

Elements are made up of how many types of atoms?

• more than 1

• 2

• 3

• 1

Water (H2O) is an example of a/an...

• element

• compound

• ion

• atom

sodium chloride (salt) is example of ...

• atomic substance

• molecular substance

• ionic substance

• alloy

Which one is a compound?

• Ni

• F

• Re

• NaCl

How many different elements are in the compound?

• 12

• 3

• 24

• 6

This picture represents:

• atomic substance

• molecular substance

• ionic substance

• alloy

What is the atomic mass of the element?

• 6

• Carbon

• 12

• 7

How many neutrons does an Aluminum atom have?

• 13

• 14

• 26

• 27