Balancing Expressions and Equations

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

• 2, 6, 3, 2
• it is already balanced
• 4, 12, 3, 4
• 2, 1, 4, 5

Balance this equation-
__P₄ + __O₂ --> __P₂O₃

• it is already balanced
• 2, 1, 3
• 1, 2, 3
• 1, 3, 2

Which of the following is an unbalanced equation?

• CaCO₃ --> CaO + CO₂
• PbO₂ + 2H₂-->2Pb + H₂O
• 2Na+ 2H₂O-->2NaOH + H₂
• CS₂ + 2O₂ --> CO₂ + 2SO₂

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__AgNO₃ + __H₂S --> __Ag₂S+ __HNO₃

• 2,1 --> 1,2
• 1,2 --> 1,1
• 1,2 --> 1,2
• 1,2 --> 2,1

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__FeCl₃ + __Ca(OH)₂ --> __Fe(OH)₃ + __CaCl₂

• 4,3--> 2,1
• 3,2 --> 3,1
• 2,3 --> 2,2
• 2,3 --> 2,3

What is the sum of the coefficients when the following equation is correctly balanced?

___ As₂O₅ + ___ H₂O → ___ H₃AsO₄

• 5

• 6

• 10

• 12

CO + ___H₂ --> CH₄ + H₂O

• 1

• 2

• 3

• 4

2NaCl + CaO --> ___Na₂O + CaCl₂

• 1

• 2

• 3

• 4

4Ag + O₂ --> ___Ag₂O

• 1

• 2

• 3

• 4

3Pb(NO₃)₂ + 2Na₃PO₄ --> ___Pb₃(PO₄)₂ + 6NaNO₃

• 1

• 2

• 3

• 4