Balancing Chemical Reactions Explained

Types of Reactions Mini Lesson

You should already have your foldable done for this part

Multiple Choice

Write the overall balanced chemical equation for the synthesis reaction: $$Sr\ +\ N_2\ \rightarrow\ ?$$  

• $$Sr\ +\ N_2\ \rightarrow\ SrN_2$$  

• $$Sr\ +\ N_2\ \rightarrow\ Sr_3N_2$$  

• $$3\ Sr\ +\ N_2\ \rightarrow\ Sr_3N_2$$  

• $$2\ Sr\ +\ N_2\ \rightarrow\ 2\ SrN$$  

Multiple Choice

Without balancing the final equation, predict the products for the synthesis reaction:  $$Li\ +\ Cl_2\ \rightarrow$$  ?

• $$LiCl_2$$  

• $$LiCl_{ }$$  

• $$Li_2Cl_2$$  

• $$Li_2Cl_{ }$$  

Multiple Choice

Write a Balanced Equation for this reaction:

C₂H₄ + 2 O₂ -->

• C₂O₂ + H₄

• CO₂ + HOH

• CO + H

• 2 CO₂ + 2H₂O

Multiple Choice

Based on the activity series, will this reaction occur?

Au (s) + HCl (l) →

• AuCl + H

• No Reaction

• AuCl + H_2

• Au₂Cl + H₂

Multiple Choice

What are the products of this reaction?

Cu+ AgNO₃ -->

• Cu(NO₃)₂+Ag

• Cu + NO₃ + Ag

• CuAg+NO₃

• Cu+ AgNO₃

Multiple Choice

Predict the products if Calcium Carbonate reacts with Silver Sulfate.

CaCO₃ + Ag₂SO₄ → ?

• Ag₂CO₃ + Ca₂SO₄

• AgCO₃ + CaSO₄

• CaSO₄ + Ag₂CO₃

• Ag(CO₃)₂ + CaSO₄

Multiple Choice

Predict the product(s) of this reaction (Don't worry about balancing the equation)

Pb(NO₃)₂ + KI →

• PbK(s) + INO₃(aq)

• No Reaction

• PbI₂(s) + KNO₃(aq)

• PbI₂(aq) + KNO₃(s)

Multiple Choice

What is the total number of atoms present in 5Na₃PO₄

• 5

• 40

• 55

• 8

Multiple Choice

How many Magnesium atoms are in 10MgCl₂?

• 10

• 5

• 20

• 12

Multiple Choice

How many Hydrogen atoms in 3(NH₄)₂CrO₄?

• 4

• 2

• 8

• 24

• 9

Multiple Choice

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1

• 2

• 3

• 4

Multiple Choice

Balance this equation

_Al +_HCl --> _H₂ +_AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Multiple Choice

A subscript is the small number below the element symbol that tells the number of _______ of that element.

• atoms

• valence electrons

• protons

• elements

Multiple Choice

Balance this equation:
P₄+O₂  -->  P₂O₃

• 3 P₄+ O₂ --> 2 P₂O₃

•  P₄+ O₂ --> 2 P₂O₃

•  P₄+ 3 O₂ --> 2 P₂O₃

•  P₄ + O₂ --> P₄O₂

Multiple Choice

What are the coefficients that would properly balance this equation?

__Al + __O₂--> __Al₂O₃

• 4,1 --> 2

• 4,3 --> 4

• 3,4 --> 1

• 4,3 --> 2

Multiple Choice

Balance this equation:

HgO ---> Hg + O₂

• It is balanced.

• 2HgO ---> 2Hg + O₂

• 2HgO ---> Hg + O₂

• HgO ---> Hg + 2O₂

Poll

How confident do you feel about balancing reactions?