Balancing Equations and Reactions

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃
• 2 Fe + 3O₂ -> Fe₂O₆
• 4 Fe + O₆ -> 2Fe₂O₃
• None of the options are correctly balanced.

Tags

NGSS.HS-PS1-7

_Na₃PO₄₊_KOH   --->
_NaOH + _ K₃PO₄

• 1 Na₃PO₄+3 KOH
  --->
  3 NaOH +  1 K₃PO₄
• 2 Na₃PO₄+2 KOH
  --->
  3 NaOH +  1 K₃PO₄
• 1 Na₃PO₄+2 KOH
  --->
  2 NaOH +  1 K₃PO₄
• 3 Na₃PO₄+3 KOH
  --->
  3 NaOH +  1 K₃PO₄

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Is this equation balanced?

• yes
• no
• Not enough information

Tags

NGSS.HS-PS1-7

Which coefficients balance this equation:
NH₃  +  O₂ ---->   NO  + H₂O

• 2,3,5,6
• 5,5,4,6
• 4,6,4,5
• 4,5,4,6

Tags

NGSS.HS-PS1-7

Balance this equation.
_CH₄ + _O₂ --> _CO₂ + _H₂O

• 1,2,1,1
• 2,1,2,1
• 1,2,1,2
• 0,2,0,2

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

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

Tags

NGSS.HS-PS1-7

Which reaction type is the following: C₅H₁₀ + O₂ --> CO₂ + H₂O

• Decomposition
• Synthesis
• Combustion
• Double Replacement

_P₄+_O₂  --->  _P₂O₃

• 3 P₄+1 O₂ ---> 2 P₂O₃
• 1 P₄+1 O₂ ---> 2 P₂O₃
• 1 P₄+ 3 O₂ ---> 2 P₂O₃
• 1 P₄+ 2 O₂ ---> 3 P₂O₃

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

The coefficients needed to balance this equation are:
_Ag(NO₃) + K₃(PO₄) --> Ag₃(PO₄) + K(NO₃)

• 1,3,1,3
• 1,1,3,3
• 3,1,1,3
• 3,1,3,1

Tags

NGSS.HS-PS1-7

The coefficients needed to balance this equation are:
_Ca₃(PO₄)₂   + _H₂(SO₄) --->  _Ca(SO₄)   + _Ca(H₂PO₄)₂

• 1,1,1,2
• 1,2,2,1
• 2,2,1,2
• 3,1,2,1