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Name _____________________________________

Name PeriodUnit 7: Reactions and Stoichiometry..Time to Over React

Skills:

1. Identify the when a reaction has taken place based on chemical change2. Use REP table to given balance reactions3. Identify Single Replacement, Combustion and Decomposition Rxns4. Complete SR reactions given reactants5. Balance and ID Double replacement rxns6. Predict unknown reactants and products 7. Calculate a mole ratio8. Use a mole ratio to calculate the #of moles of reactants and products used in a rxn

Unit 7: Vocabulary: Complete throughout unit. Due on test day!

Word

Definition

Reaction

Reactant

Product

Phase

Chemical Change

Yield

Precipitate

Balanced

Conservation of Mass

Combustion

Single Replacement

Double Replacement

Stoichiometry

Skill 1: Identify occurrence of a chemical reaction based on chemical change indicator

Chemical Equations

A chemical equation shows what takes place during a chemical reaction. Lets break down the elements of a chemical equation (hehehe)

1 egg (l) + 1 cup of flour (s) + 2 cups of chocolate chips (s) 8 chocolate chip pancakes (s)

Symbol/Vocabulary

Explanation

Pancake Model

The Ingredients of a chemical reaction!

The end result!

Yields, separates reactants from products

(s), (l), (g)

Designates an aqueous solution; the substance is dissolved in water.

Coefficient

Remember

Physical Change

Chemical Change

It does NOT change ________________________,

it just changes

___________________________________

A change that does NOT affect a substances chemical composition

Changing ________________________________

into a ____________________________________

________________________________________

A color change may occur and a ________________________________________

_________________________________________

Physical Change Phrases

Chemical Change Phrases

Determine if a chemical reaction has taken place in the below situations:

Breaking Glass ____________

Dissolving Sugar ___________

Rusting iron_________________

Boiling Water_______________

Digesting Sugar_____________

Burning Gasoline____________

Forming Ozone______________

Cooking Eggs_______________

Skill 2: Use REP or other Method to balance Chemical Equations

Example: HCl (aq) + Zn (s) H2(g) + ZnCl2(aq) (NOT BALANCED)

Problem: The above chemical reaction breaks the Law of Conservation of Mass:

Matter is neither ___________________ or ___________________ in a chemical reaction.

So the ___________ of atoms must remain _______________ in a reaction

Balancing Equations: _________________________ are used to balance the number of at atoms of each element on both sides of the reaction. Coefficients must be the __________________whole number that balance the reaction.

Number and kind of elements on the left (Reactants) is equal to the number and kind on the right (Products)!

NOTE: Coefficients can be changed, HOWEVER, subscripts CANNOT!

M&M Balancing:

Draw:

1. With your M&Ms, create CH4 +O2.

Draw:

2. USING THE SAME M&Ms, create CO2 +H2O.

3. Did you need any more M&Ms for the second group of elements?

____________________________________________________________________________________________________________________________________________________________________________

4. Could we describe this as a balanced reaction?

5. ____________________________________________________________________________________________________________________________________________________________________________

6. Which are the reactants and which are the products?

____________________________________________________________________________________________________________________________________________________________________________

7. On your whiteboard, write out the balanced chemical reaction. Label the reactants, products and yield sign. Eat M&MS.

Challenge Balance:

_______Na + ________ MgCl2 ______NaCl + ________Mg

Using the REP Method:

Example: ____ HCl (aq) + ____ Zn (s) ____ H2(g) + ____ ZnCl2(aq)

Reactants

Elements

Products

H

Cl

Zn

Examples: Balance the following chemical reactions

1. _____ N2 + _____ H2 _____ NH3 2. _____ Al2O3 _____ Al + ____ O2

Elements

Elements

3. _____ Al + _____ Br2 ____ AlBr3 4. _____ AlBr3 + _____ Cl2 ____ AlCl3 + _____ Br2

Elements

Elements

5. _______Fe + ______O2 ______Fe2O36. _______H2 + ________O2 _______H2O

Elements

Elements

When a polyatomic ion is present AND it stays completely _______ during the reaction!

1. __Al + __CuSO4------> ___Al2(SO4)3+ ___Cu

R

E

P

Al

Cu

SO4

2. ___Pb(C2H3O2)+ ____HCl ____PbCl2+ ____H(C2H3O2)

R

E

P

Pb

H

Cl

(C2H3O2)

If a polyatomic ion is present on one side of the equation and not on the other, you are forced to ________ it apart and balance each atom.

___SO3(g) +___ H2O

____H2SO4(aq)

R

E

P

S

O

H

Name_______________________ Balancing HomeworkPeriod_____

Balance the equations below Using the REP method:

R

E

P

1 x 2=2

K

1 x 2=2

1 x 2=2

Cl

1 x 2=2

3x2=6

O

2x3=6

1) ____ KClO3 ____ KCl + ____ O2

2)____ NaCl + ____ F2 ____ NaF + ____ Cl2

3)____ Pb(OH)2 + ____ HCl ____ HOH + ____ PbCl2

4)____ AlBr3 + ____ K2SO4 ____ KBr + ____ Al2(SO4)3

5)____ CH4 + ____ O2 ____ CO2 + ____ H2O

6)____ FeCl3 + ____ NaOH ____ Fe(OH)3 + ____NaCl

7)____ P + ____O2 ____P2O5

8)____ Na + ____ H2O ____ NaOH + ____H2

9)____ Ag2O ____ Ag + ____O2

10)____ S8 + ____O2 ____ SO3

Skill 3: Identify Synthesis, Single Replacement, Combustion and Decomposition Rxns

Synthesis: When two or more reactants combine to form ____ ________________ product

General Equation: ________________________________

Balancing:

Balance the following reactions:

1. ____ S + ____ O2 ____ SO3 2. ____ P4 + ____ O2 ____ P2O3

Elements

3. ____ C + ____ H2 ____ C3H84. ____ CaO + _____H2O _____ Ca(OH)2

Elements

Real World Example: Magnesium and Oxygen combine to from Magnesium Oxide!

____ Mg (s) + ____ O2 (g) ____ MgO (s)

Decomposition: A ______________________ compound is _________________ down (________________) into ____________ or _______________ ____________________ substances

General Equation: ________________________________

Balancing:

Balance the following synthesis reactions:

1. ____ HgO ____ Hg + ____ O2 2. ____ Al2O3 ____ Al + ____ O2

Elements

3.____ AgCl ____ Ag + _____ Cl24. ____ H2O2 (l) ____ H2O (l) + ______ O2 (g)

Elements

Real World Example: Hydrogen peroxide decomposes into water and oxygen!

Combustion: An __________________ compound (contains ____ and ____) reacts with

______________ and creates ONLY _______________________ and ________________________

General Equation: ________________________________

Balancing:

Balance the following reactions:

1. ___C4H12 + ____ O2 ____ H2O + ______ CO2 2. _______C2 H6 + _____ O2 ______ H2O + _______ CO2

Elements

Skill 4: Complete SR reactions given reactants

Single Replacement Reactions: For a single replacement reaction to occur, the lone metal listed must be ________ on Reference Table J than the metal in the compound in order for it to ________________ the metal in the compound.

General Equation: _____________________________________

General Equation: ________________________________

Balancing:

__Zn + __HCl __ZnCl2 + __ H2 ____ Li + ___ HOH ____ LiOH + ___H2

Finish the Chemical Reaction:

Use Table J to see if the following reactions can occur. If it can, write the product and balance the equation (if necessary).

1. ____ Zn + ____ H2SO4 ___________________________

2. ____Pb + _____ FeCl3 ___________________________

3. ____ Cl2 + _____ LiI ____________________________

Name_______________________________Period___________

Balance each and determine the type of reaction. (Synthesis, Decomposition, Combustion, SR)

TYPE:

1.) ____CaO + ____P2O5 ____Ca3(PO4)2 ________________

2.) ____ Ag + ____ H2S ____ Ag2S + ____ H2(s) ________________

3.) ____ N2O5 ____ N2 +____ O2________________

4.) ____ C3H8(g) + ____ O2(g) ____ CO2(g) + ____ H2O(g) ________________

5.) ____ NaClO3(aq) ____ NaCl(aq) +____ O2(g) ________________

Name _______________________Bell Ringer Single Replacement Practice

For each of the following determine whether or not a single replacement reaction will occur using Reference Table J. If it does write out products and balance the reaction.

1. ____Ca + ____H2O

2. ____Zn + ____HCl

3. ___Ag + ___AuCl3 ___AgCl +