chapter 10 chemical reactions. an equation describes a reaction must be balanced to follow the law...
TRANSCRIPT
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Chapter 10
Chemical Reactions
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An equation Describes a reaction Must be balanced to follow the
Law of Conservation of Mass Can only be balanced by changing
the coefficients. Has special symbols to indicate state,
and if catalyst or energy is required.
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Reactions Come in 5 types. Can tell what type they are by the
reactants.
– Single Replacement happens based on the activity series. A+BX AX+B
– Double Replacement happens if the product is a solid, water, or a gas.
AX+BY AY+BX
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Reactions Come in 5 types. Can tell what type they are by the
reactants.
– Synthesis- A + B AB
– Combustion- Oxygen combines with substance. 2H2(g)+ O2(g) 2H2O(g)
– Decomposition- AB A + B
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The Process1. Determine the type by looking at the
reactants.
2. Put the pieces next to each other based on type
3. Use charges to write the formulas
– Elements get 2?
4. Use coefficients to balance the equation.
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All chemical reactions have two parts Reactants - the substances you start
with Products- the substances you end up
with The reactants turn into the products. Reactants Products
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In a chemical reaction The way atoms are joined is changed Atoms aren’t created or destroyed. Can be described several ways In a sentence
– Copper reacts with chlorine to form copper (II) chloride.
In a word equation Copper + chlorine copper (II) chloride
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Symbols used in equations Table 11.1 the arrow separates the reactants from
the products Read “reacts to form” The plus sign = “and” (s) after the formula -solid (g) after the formula -gas (l) after the formula -liquid
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Symbols used in equations (aq) after the formula - dissolved in
water, an aqueous solution. used after a product indicates a gas
(same as (g)) used after a product indicates a solid
(same as (s))
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Symbols used in equations indicates a reversible reaction
(More later) shows that heat
is supplied to the reaction is used to indicate a catalyst
used in this case, platinum.
heat ,
Pt
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What is a catalyst? A substance that speeds up a reaction
without being changed by the reaction. Enzymes are biological or protein
catalysts.
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Skeleton Equation Uses formulas and symbols to describe
a reaction doesn’t indicate how many. All chemical equations are sentences
that describe reactions.
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Convert these to equations Solid iron (III) sulfide reacts with
gaseous hydrogen chloride to form solid iron (II) chloride and hydrogen sulfide gas.
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Convert these to equations Nitric acid dissolved in water reacts with
solid sodium carbonate to form liquid water and carbon dioxide gas and sodium nitrate dissolved in water.
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The other way Fe(g) + O2(g) Fe2O3(s)
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The other way Cu(s) + AgNO3(aq)
Ag(s) + Cu(NO3)2(aq)
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Balancing Chemical Equations
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Balanced Equation Atoms can’t be created or destroyed All the atoms we start with we must end
up with A balanced equation has the same
number of atoms of each element on both sides of the equation.
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C + O2 CO2
This equation is already balanced What if it isn’t already?
C + OO COO
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C + O2 CO
We need one more oxygen in the products.
Can’t change the formula, because it describes what actually happens
+ OCOO
C OCC
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Must have started with two C 2 C + O2 2 CO
+ OCC OCC
Must be used to make another CO But where did the other C come from?
OO
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Rules for balancing Write the correct formulas for all the
reactants and products Count the number of atoms of each type
appearing on both sides Balance the elements one at a time by
adding coefficients (the numbers in front)
Check to make sure it is balanced.
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Never Change a subscript to balance an equation.
– If you change the formula you are describing a different reaction.
– H2O is a different compound than H2O2
Never put a coefficient in the middle of a formula– 2 NaCl is okay, Na2Cl is not.
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Example
H2 + H2OO2
Make a table to keep track of where you are at
R PH
O
2
2
2
1
Need twice as much O in the product
H2 + H2OO2 2
2
Changes the OAlso changes the H
4
Need twice as much H in the reactant
2
Recount
4
The equation is balanced, has the same number of each kind of atom on both sides
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Example
H2 + H2OO2
R PH
O
2
2
2
1
2
2
4
2
4
This is the answer
Not this
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Examples
CH4 + O2 CO2 + H2O
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ExamplesAgNO3 + Cu Cu(NO3)2 + Ag
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Examples
Al + N2 Al2N3
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Examples P + O2 P4O10
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Examples
Na + H2O H2 + NaOH
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Techniques If an atom appears more than once on a
side, balance it last. If you fix everything except one element,
and it is even on one side and odd on the other, double the first number, then move on from there.
C4H10 + O2 CO2 + H2O
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Types of Reactions
Predicting the Products
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Types of Reactions There are too many reactions to
remember Fall into categories. We will learn 5 types. Will be able to predict the products. For some we will be able to predict
whether they will happen at all. Must recognize them by the reactants
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#1 Combination Reactions Combine - put together 2 elements, or compounds combine to
make 1 compound.
Ca +O2 CaO
SO3 + H2O H2SO4
We can predict the products if they are two elements.
Mg + N2
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Write and balance Ca + Cl2
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Write and balance Fe + O2 iron (II) oxide
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Write and balance Al + O2
Remember that the first step is to write the formula
Then balance Also called synthesis reaction
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Combining two compounds If they tell you it is combination, you will
make one product Two compounds will make a polyatomic
ion. CO2 + H2O →
H2O + Cl2O7→
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#2 Decomposition Reactions decompose = fall apart
one reactant falls apart into two or more elements or compounds.
NaCl Na + Cl2
CaCO3 CaO + CO2
electricity
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#2 Decomposition Reactions Can predict the products if it is a binary
compound Made up of only two elements Falls apart into its elements
H2O electricity
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#2 Decomposition Reactions HgO
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#2 Decomposition Reactions If the compound has more than two
elements you must be given one of the products
The other product will be from the missing pieces
NiCO3 NiO +
H2CO3(aq)CO2 +
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#3 Single Replacement One element replaces another Reactants must be an element and a
compound. Products will be a different element and
a different compound. Na + KCl K + NaCl
F2 + LiCl LiF + Cl2
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Na + KCl K + NaCl
Na K Cl
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F2 + 2 LiCl 2 LiF + Cl2
F
Li Cl
FLi Cl
Li
Li
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#3 Single Replacement Metals replace metals (and hydrogen) Al + CuSO4 Zn + H2SO4
Think of water as HOH Metals replace one of the H, combine
with hydroxide. Na + HOH
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#3 Single Replacement We can tell whether a reaction
will happen Some are more active than other More active replaces less active There is a list on page 333
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#3 Single Replacement There is a list on page 333 Higher on the list replaces lower. If the element by itself is higher, it
happens, if element by itself is lower, it
doesn’t
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#3 Single Replacement Note the * H can be replaced in acids
by everything higher Only the first 4 (Li - Na)
react with water.
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#3 Single Replacement Al + HCl
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#3 Single Replacement Fe + CuSO4
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#3 Single Replacement Pb + KCl
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#3 Single Replacement Al + H2O
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#3 Single Replacement What does it mean that Ag
is on the bottom of the list?
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#3 Single Replacement Nonmetals can replace other nonmetals
Limited to F2 , Cl2 , Br2 , I2
The order of activity is that on the table. Higher replaces lower. F2 + HCl
Br2 + KCl
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#4 Double Replacement Two things replace each other. Reactants must be two ionic compounds or
acids. Usually in aqueous solution
NaOH + FeCl3 The positive ions change place.
NaOH + FeCl3 Fe3+OH- + Na+Cl-
NaOH + FeCl3 Fe(OH)3 + NaCl
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3NaOH + FeCl3 Fe(OH)3 + 3NaCl
Na+ O- H+
Na+ O- H+
Na+ O- H+
Fe3+
Cl-
Cl-
Cl-
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#4 Double Replacement Will only happen if one of the products
– doesn’t dissolve in water and forms a solid
– or is a gas that bubbles out.– or is a covalent compound usually
water. Polyatomic ions don’t change from side
to side
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Complete and balance assume all of the reactions take place.
CaCl2 + NaOH
CuCl2 + K2S
KOH + Fe(NO3)3
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Complete and balance KOH + Fe(NO3)3
H3PO4 + Ca(OH)2
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How to recognize which type Look at the reactants E for element C for compound E + E Combination C Decomposition E + C Single replacement C + C Double replacement
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Last Type Combustion A compound composed of only C H and
maybe O is reacted with oxygen If the combustion is complete, the products
will be CO2 and H2O. If the combustion is incomplete, the
products will be CO and H2O. or just C and H2O. O2 will always be the second reactant
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Ionic Compounds and acids Fall apart into ions when they dissolve That’s why they conduct electricity when
dissolved. So when we write them as (aq) they are
really separated NaCl(aq) is really Na+(aq) and Cl-(aq) K2SO4 (aq) is really K+(aq) and
SO42-(aq)
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Reactions in aqueous solutions Many reactions happen in solution Makes it so the ions separate so they can
interact. Solids, liquids, and gases are not
separated, only aqueous
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Complete Ionic Equation Every aqueous compound is written as
separate ions Solids, liquids and gases as whole
compounds MgCl2(aq) + PbSO4(aq) →
MgSO4(aq) + PbCl2(s)
Is really Mg2+(aq) + Cl-(aq) + Pb2+(aq) + SO4(aq) →
Mg2+(aq) + SO4(aq) + PbCl2(s)
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Write the complete ionic equation for
FeBr3(aq) + KOH(aq) →KBr (aq) + Fe(OH)3(s)
Fe3+(aq)Br-(aq) K+(aq)OH-(aq)
+ + + →
+
Br-(aq) Fe(OH)3(s)
+
K+(aq)
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Write the complete ionic equation for
CaCl2(aq) + MgSO4(aq) →CaSO4(s) + MgCl2(aq)
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Write the complete ionic equation for
Ba(OH)2(aq) + H2SO4(aq) →BaSO4(s) + HOH(l)
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The complete ionic equation is Fe3+(aq)+ Br-(aq) + K+(aq) +OH-(aq) →
K+(aq) +Br-(aq) + Fe(OH)3(s)
K+ and Br- don’t change. They are spectator ions Could be eliminated Fe3+(aq) +OH-(aq) →Fe(OH)3(s)
This is what really changes
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Net ionic equation Shows only those particles that change
before and after. Eliminate spectator ions Needs to be balanced in terms of both
mass and charge Fe3+(aq) +OH-(aq) →Fe(OH)3(s)
Fe3+(aq) +3 OH-(aq) →Fe(OH)3(s)
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Write the net ionic equation HCl (aq) + Ba(OH)2 (aq) →
BaCl2(s) + HOH (l)
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Write the net ionic equation Al + FeSO4(aq) → Al2(SO4)3(aq) + Fe
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Write the net ionic equation Cl2(s) + NaI(aq) → NaCl(aq) + I2(s)
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Write the net ionic equation K2CO3(aq) + MgI2(aq) →
MgCO3(s) + KI(aq)
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Net ionic equations Written for single and double
replacement.
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Predicting precipitates Solids formed from aqueous solution. You can predict them if you know some
general rules for solubility.
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These things are soluble1. Salts with alkali metals and
ammonium
2. Salts of nitrates and chlorates
3. Salts of sulfates except Ag+, Pb2+, Hg2
2+, Ba2+, and Sr2+
4. Salts of chlorides except Ag+, Pb2+, and Hg2
2+
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These things are insoluble5. Carbonates, phosphates, chromates,
sulfides, and hydroxides Unless they fall under rule # 1
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Is it soluble? LiBr Ba(NO3)2
CaSO4
PbCl2 CaCO3
K2CO3
Cd(ClO3)2
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Is there a reaction? For double replacement- has to make
gas, solid or water. Water from an acid- H+ and a
hydroxide- OH- makes HOH Solids- from solubility rules Exchange ions and see if something is
insoluble
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Is there a reaction? MgSO4 + NaOH →
H2SO4 + KOH →
K3PO4 + FeF3→