Balancing Equations

Two reactants and one product

• decomposition

• single replacement

• synthesis

• combustion

 

CxHy +O₂ --> H₂O + CO₂

• decomposition

• combustion

• single replacement

• double replacement

One reactant into two or more products

• synthesis

• decomposition

• single replacement

• double replacement

 

One element replaces another in a compound.

• synthesis

• single replacement

• double replacement

• decomposition

Which of the following chemical equations is correctly balanced? More than one answer may be correct.

• 2 Li  +  O₂  →  LiO₂

• Ag  +  2 HCl  →  AgCl  +  H₂

• 2 C₃H₆  +  9 O₂  →  6 CO₂  +  6 H₂O

• MgCl₂  →  Mg  + Cl₂

Potassium (K) combines with magnesium bromide (MgBr2) to form potassium bromide (KBr) and magnesium (Mg) during a chemical reaction.

Which of the following shows the balanced chemical equation for this reaction?

• 2K + MgBr  >  

  2KBr + Mg

• 2K + MgBr₂  >  2KBr + Mg

• K + MgBr₂  > 

  KBr + Mg

• K + MgBr₂  >  KBr₂ + Mg

The chemical reaction shown below shows lead chloride decomposing into lead and chlorine.

PbCl₂  Pb + Cl₂

Does the chemical reaction shown obey the law of conservation of mass?

• No, because a new molecule is produced.

• No, because one particle breaks into two particles.

• Yes, because the equation is balanced.

• Yes, because the number of molecules of Cl2 and atoms of Pb are equal.

What type of reaction equation is represented by the formula below?      

 AB + CD  →  AC + BD

• combustion

• single replacement

• double replacement

• synthesis

• decomposition

What type of reaction equation is represented by the formula below?            

A  +  B  →  AB

• combustion

• single replacement

• double replacement

• synthesis

• decomposition

What type of reaction equation is represented by the formula below?               AB  →  A + B

• combustion

• single replacement

• double replacement

• synthesis

• decomposition