Balancing Chemical Equations Practice Quiz I

What is the underlined portion called?

• Reactants
• Product

The red numbers in the image below represent ________

• subscripts
• coefficients
• I don't know, and don't want to try
• None of the answers are correct

What coefficients should be used to balance the following: __CO₂ + __H₂O -> __O₂ + __C₆H₁₂O₆

• 6,3,4,none

• 6,4,3,1

• 6,6,6,none

• 2,2,4,none

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

• YES

• NO

Balance this equation:

Sb₂S₃ + O₂ ---> Sb + SO₂

• It is balanced.

• Sb₂S₃ + O₂ ---> 2Sb + SO₂

• Sb₂S₃ + 3O₂ ---> 2Sb + 3SO₂

• 3Sb₂S₃ + 3O₂ ---> 2Sb + SO₂

Why is it called the Law of Conservation of Matter/Mass? 

• Energy is created and destroyed 
• Energy is never created, nor destroyed-- it always moves 
• Energy moves between particles
• Energy stops moving at the end of the universe 

Balance this equation: _Zn + _O2 --> _ZnO

• 1, 1, 2

• 2, 1, 2

• 1, 1, 1

• 2 ,2, 2

How many Oxygens are in this molecule? 
(OH)₂

• 4
• 1
• 2
• 3

The chemical equation 2H_{2 +} O₂ --> 2H₂O is a reaction

(a)   ​ ​

• synthesis
• decomposition
• single displacement
• double displacement

What is the total number of atoms present in 5Na₃PO₄?

• 5

• 55

• 40

• 8