Test Review - Chemical Reaction

What do the coefficients need to be in the following equation in order to be balanced?
_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

What do the coefficients need to be in the following equation in order to be balanced?
_CH₄ + _O₂ → _CO₂ + _H₂O

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

What do the coefficients need to be in the following equation in order to be balanced?
_Mg + _Cl₂ → _MgCl₂

• 1, 2,1
• already balanced
• 2,1,1
• 1,1,2

Tags

NGSS.MS-PS1-5

What are the coefficient used to balance the equation below?
__Ag₂O →__ Ag +___O₂

• 2,4,1
• 1,1,1
• 2,1,2
• 2,2,2

Tags

NGSS.HS-PS1-7

Balance this reaction: 
_AlBr₃ + _ K₂SO₄ → _ KBr + _ Al₂(SO₄)₃

• 1,1,1,1
• 2,3,6,1
• 2,6,1,1
• 3,1,2,2

Classify

HI --> H₂ + I₂

• synthesis

• decomposition

• single replacement

• double replacement

Classify
Zn + H₂S → ZnS + H₂

• synthesis
• combustion
• single replacement
• double replacement

Classify
CH₄ + O₂ → CO₂ + H₂O 

• single replacement
• double replacement
• synthesis
• combustion

Classify
FeS + HCl → H₂S + FeCl₂

• synthesis
• combustion
• single replacement
• double replacement

Classify
Fe + O₂ → Fe₂O₃

• synthesis
• decomposition
• double replacement 
• single replacement