Elements vs Compounds

A pure substance made of one kind of atom is a/an

• Compound

• Element

• Molecule

• Mixture

We represent compounds using

• Symbols

• Letters

• Subscripts

• Formulas

A pure substance is

• a substance that cannot be broken down any simpler

• A complex substance

• A mixture

• a substance that can be broken down

How many atoms of Carbon are in the formula CO₂

• 2

• 1

• 0

• 3

A pure substance that is made of molecules

• Atom

• Element

• Compound

• Symbol

How many elements are there?

• 12

• Millions

• Thousands

• 118

The smallest part of an element?

• atoms or molecules with the same kind of atom

• molecules

• atoms

• molecules with different kinds of atoms

Elements are represented by

• Formulas

• Symbols

• Subscripts

• Molecules

A subscript tells you

• how many atoms of each element there are in a formula

• how many compounds there are

• how many molecules there are

• how many particles there are

2 or more atoms chemically combined are

• atoms

• bonds

• compounds

• molecules