Balancing Chemical Reactions

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?