Chemical Reaction Review

How is the reactivity of an atom determined?

• Protons
• Valence Electrons
• Atomic Number
  Atomic Mass
• Electrons

How do you differentiate between an element and a compound?

• An element is made of two or more different atoms and a compound is made up of two or more of the same atom.
• An element is made of one kind of atom and a compound is made up of two or more different atoms.

Using the periodic table, how is the number of valence electrons determined?

• Group number 
• Period number
• Atomic mass
• Atomic number

Using the periodic table, how is the number of electron energy levels determined?

• Atomic number
• Period
• Group number
• Atomic mass

Which of the following is an element?

• CH₄
• H₂O
• O₂
• Fe₂O₃

4Fe + 3O₂ ----> 2Fe₂O₃
Using the formula above, identify the compound(s).

• Fe
• O₂
• 2Fe₂O₃
• They are all compounds

4Fe + 3O₂ ----> 2Fe₂O<sub>3

Does the equation above follow the Law of Conservation of Mass?</sub>

• Yes
• No

4Fe + 3O₂ ----> 2Fe₂O<sub>3

How many elements are in the equation above?</sub>

• 10
• 20
• 1
• 2

How many elements are in the image above?

• 7
• 3
• 4
• 1

Which formula best represents the model above?

• SHO
• H₂O
• SO₃H₂O
• SHO₄