Chemical Equations Review

Fill in the blanks with coefficient:

PCl₅+_ H₂O→_ HCl+H₃PO₄

• 4, 5

• 1, 6

• 3, 8

• 2,2

Which equation is balanced?

• PbO₂ + 2H₂--> H₂SO₄

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

• 2Na + 2H₂O --> 2NaOH + H

What is a coefficient?

• The small number on the right of the chemical symbol.
• The large number to the left of a formula.

Balance this equation
_Zn+_HCl-->_ZnCl₂ +_H₂

• 1,1,2,1
• 1,1,1,2
• 1,2,1,1
• 2,1,1,1

3Ca + 2AlCl₃ --> 3CaCl₂ + 2Al

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

2Pb(NO₃)₂ --> 2PbO + 4NO₂ + O₂

• Synthesis 

• Decomposition

• Single Replacement

• Combustion

3Mg + N₂ --> Mg₃N₂

• Synthesis 

• Decomposition

• Single Replacement

• Combustion

Which reaction type is the following: C₅H₁₀O₄ + O₂ --> CO₂ + H₂O

• Decomposition
• Single Replacement
• Combustion
• Double Replacement

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

• charge
• subscript
• random number
• coefficient

Which chemical reaction switches 2 elements?

• Double Replacement
• Single Replacement
• Combustion
• Decomposition