Balance Chemical Equations

When the equation H₂O₂ --> H₂O + O₂ is completely balanced, the coefficient for water is 

• 5

• 8

• 3

• 4

Tags

NGSS.MS-PS1-5

When the equation NH₃ + O₂ --> HNO₃ + H₂O is completely balanced using smallest whole numbers, the coefficient of O₂ would be

• 1

• 2

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• 4

Tags

NGSS.MS-PS1-5

Write a complete balanced reaction for the following.
Calcium metal reacts with oxygen gas to form a solid

• 2 Ca (s) + O₂ (g) --> 2 CaO (s)

• 2 Ca (s) + 2 O (g) --> 2 CaO (s)

• Ca (s) + O₂ (g) --> 2 CaO (s)

• Ca (s) + O₂ (g) -->  CaO₂ (s)

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

When balancing this equation, Fe + Cl₂ → FeCl₃, the correct coefficient for Cl₂?

• 1

• 2

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• 4

Tags

NGSS.MS-PS1-5

Balance the following equation: Cr(s) + Fe(NO₃)₂ (ag) → Fe(s) + Cr(NO₃)₃ (ag)

• 2,3,3,2

• 2,3,2,3

• 4,6,6,2

• 1,3,3,1

Tags

NGSS.MS-PS1-5

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

• 1,1,2,1

• 1,1,1,2

• 1,2,1,1

• 2,1,1,1

Tags

NGSS.MS-PS1-5

Balance this equation.
_Mg + _Cl₂ --> _MgCl₂

• 2,1,1

• already balanced

• 1,2,1

• 1,1,2

Tags

NGSS.MS-PS1-5

Fill in the blank to balance the chemical equation.
2KI + ____Cl₂ → 2KCl + I₂

• 1

• 2

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Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

What coefficient should go in the blank space to balance the chemical equation? 
2Al  +____  HCl   →    2AlCl₃  +  3H2

• 2

• 4

• 3

• 6

Tags

NGSS.MS-PS1-5

Balance this equation

_ S + _ O₃ → _ SO₂

Note: Write the coefficient "1" to avoid ambiguity

Tags

NGSS.MS-PS1-5