1. The document provides information on different types of chemical reactions including synthesis, decomposition, single replacement, double replacement, and combustion reactions. It gives examples of each type of reaction and has students practice writing and identifying reaction types.
2. Step-by-step instructions are provided for writing chemical equations, including identifying the reaction type, predicting products, and balancing the equation. Common diatomic elements are noted.
3. Additional details are given for specific reaction types like decomposition reactions, and for honors students, writing total ionic, net ionic and acid-base equations is explained using solubility rules. Practice problems are provided throughout for students.
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this module gives the idea about the characteristics of chemical reaction what happens when a during the chemical reaction and we can identify it is a chemical reaction
characteristics of chemical reaction ICSE class 9tabishkamran
this module gives the idea about the characteristics of chemical reaction what happens when a during the chemical reaction and we can identify it is a chemical reaction
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1. Chemical Reactions
Chemistry I – Chapter 11b
Chemistry I Honors – Chapter 8
ICP – Chapter 21b
SAVE PAPER AND INK!!! When you
print out the notes on PowerPoint,
print "Handouts" instead of
"Slides" in the print setup. Also,
turn off the backgrounds
(Tools>Options>Print>UNcheck
"Background Printing")!
2. Types of ReactionsTypes of Reactions
• There are five types of chemical
reactions we will talk about:
1. Synthesis reactions
2. _____________ reactions
3. Single displacement reactions
4. ________________ reactions
5. Combustion reactions
• You need to be able to identify the type
of reaction and predict the product(s)
3. Steps to Writing ReactionsSteps to Writing Reactions
• Some steps for doing reactions
1. Identify the type of reaction
2. Predict the product(s) using the type of reaction
as a model
3. Balance it
Don’t forget about the diatomic elements!
(BrINClHOF) For example, Oxygen is O2 as an
element.
In a compound, it can’t be a diatomic element
because it’s not an element anymore, it’s a
4. 1. Synthesis reactions1. Synthesis reactions
• Synthesis reactions occur when two
substances (generally elements) combine
and form a compound. (Sometimes these are
called combination or addition reactions.)
reactant + reactant 1 product
• Basically: A + B AB
• Example: 2H2 + O2 2H2O
• Example: C+ O2 CO2
6. PracticePractice
• Predict the products. Write and balance
the following synthesis reaction equations.
• Sodium metal reacts with chlorine gas
Na(s) + Cl2(g)
• Solid Magnesium reacts with fluorine gas
Mg(s) + F2(g)
• Aluminum metal reacts with fluorine gas
Al(s) + F2(g)
7. 2. Decomposition Reactions2. Decomposition Reactions
• Decomposition reactions occur when
a compound breaks up into the elements
or in a few to simpler compounds
• 1 Reactant Product + Product
• In general: AB A + B
• Example: 2 H2O 2H2 + O2
• Example: 2 HgO 2Hg + O2
9. Decomposition ExceptionsDecomposition Exceptions
• Carbonates and chlorates are special
case decomposition reactions that do not
go to the elements.
• Carbonates (CO3
2-
) decompose to carbon
dioxide and a metal oxide
• Example: CaCO3 CO2 + CaO
• Chlorates (ClO3
-
) decompose to oxygen gas
and a metal chloride
• Example: 2 Al(ClO3)3 2 AlCl3 + 9 O2
• There are other special cases, but we will not
explore those in Chemistry I
10. PracticePractice
• Predict the products. Then, write and
balance the following decomposition
reaction equations:
• Solid Lead (IV) oxide decomposes
PbO2(s)
• Aluminum nitride decomposes
AlN(s)
11. PracticePractice
Identify the type of reaction for each of the
following synthesis or decomposition
reactions, and write the balanced equation:
N2(g) + O2(g)
BaCO3(s)
Co(s)+ S(s)
NH3(g) + H2CO3(aq)
NI3(s)
(make Co be +3)
Nitrogen monoxide
12. 3. Single Replacement Reactions3. Single Replacement Reactions
• Single Replacement Reactions occur
when one element replaces another in a
compound.
• A metal can replace a metal (+) OR
a nonmetal can replace a nonmetal (-).
• element + compound element + compound
A + BC AC + B (if A is a metal) OR
A + BC BA + C (if A is a nonmetal)
(remember the cation always goes first!)
When H2O splits into ions, it splits into
H+
and OH-
(not H+ and O-2
!!)
14. Single Replacement ReactionsSingle Replacement Reactions
• Write and balance the following single
replacement reaction equation:
• Zinc metal reacts with aqueous
hydrochloric acid
Zn(s) + HCl(aq) ZnCl2 + H2(g)
Note: Zinc replaces the hydrogen ion in the
reaction
2
15. Single Replacement ReactionsSingle Replacement Reactions
• Sodium chloride solid reacts with fluorine gas
NaCl(s) + F2(g) NaF(s) + Cl2(g)
Note that fluorine replaces chlorine in the compound
• Aluminum metal reacts with aqueous copper
(II) nitrate
Al(s)+ Cu(NO3)2(aq)
2 2
16. 4. Double Replacement Reactions4. Double Replacement Reactions
• Double Replacement Reactions occur
when a metal replaces a metal in a compound
and a nonmetal replaces a nonmetal in a
compound
• Compound + compound compound+
compound
• AB + CD AD + CB
17. Double Replacement ReactionsDouble Replacement Reactions
• Think about it like “foil”ing in algebra, first and
last ions go together + inside ions go together
• Example:
AgNO3(aq) + NaCl(s) AgCl(s) + NaNO3(aq)
• Another example:
K2SO4(aq) + Ba(NO3)2(aq) KNO3(aq) + BaSO4(s)
2
19. 5. Combustion Reactions5. Combustion Reactions
• Combustion reactions
occur when a hydrocarbon
reacts with oxygen gas.
• This is also called
burning!!! In order to burn
something you need the 3
things in the “fire triangle”:
1) A Fuel (hydrocarbon)
2) Oxygen to burn it with
3) Something to ignite the
reaction (spark)
20. Combustion ReactionsCombustion Reactions
• In general:
CxHy + O2 CO2 + H2O
• Products in combustion are
ALWAYS carbon dioxide and
water. (although incomplete
burning does cause some by-
products like carbon monoxide)
• Combustion is used to heat
homes and run automobiles
(octane, as in gasoline, is C8H18)
23. Mixed PracticeMixed Practice
• State the type, predict the products, and
balance the following reactions:
1. BaCl2 + H2SO4
2. C6H12 + O2
3. Zn + CuSO4
4. Cs + Br2
5. FeCO3
24. Total Ionic EquationsTotal Ionic Equations
(HONORS ONLY)(HONORS ONLY)
Once you write the molecular equationOnce you write the molecular equation
(synthesis, decomposition, etc.), you should(synthesis, decomposition, etc.), you should
check for reactants and products that arecheck for reactants and products that are
soluble or insoluble.soluble or insoluble.
We usually assume the reaction is in waterWe usually assume the reaction is in water
We can use a solubility table to tell us whatWe can use a solubility table to tell us what
compounds dissolve in water.compounds dissolve in water.
If the compound is soluble (does dissolve inIf the compound is soluble (does dissolve in
water), then splits the compound into itswater), then splits the compound into its
component ionscomponent ions
If the compound is insoluble (does NOT dissolveIf the compound is insoluble (does NOT dissolve
in water), then it remains as a compoundin water), then it remains as a compound
26. Solubilities Not on the Table!Solubilities Not on the Table!
Gases only slightly dissolve in waterGases only slightly dissolve in water
Strong acids and bases dissolve in waterStrong acids and bases dissolve in water
Hydrochloric, Hydrobromic, Hydroiodic, Nitric,Hydrochloric, Hydrobromic, Hydroiodic, Nitric,
Sulfuric, Perchloric AcidsSulfuric, Perchloric Acids
Group I hydroxides (should be on your chart anyway)Group I hydroxides (should be on your chart anyway)
Water slightly dissolves in water! (H+ and OH-)Water slightly dissolves in water! (H+ and OH-)
For the homework… SrSOFor the homework… SrSO44 is insoluble; BeIis insoluble; BeI22 andand
the products are solublethe products are soluble
There are other tables and rules that cover moreThere are other tables and rules that cover more
compounds than your table!compounds than your table!
28. Net Ionic EquationsNet Ionic Equations
These are the same as total ionicThese are the same as total ionic
equations, but you should cancel out ionsequations, but you should cancel out ions
that appear on BOTH sides of thethat appear on BOTH sides of the
equationequation
Total Ionic Equation:Total Ionic Equation:
2 K2 K++
+ CrO+ CrO44
-2-2
+ Pb+ Pb+2+2
+ 2 NO+ 2 NO33
--
PbCrOPbCrO44 (s) + 2 K(s) + 2 K++
+ 2 NO+ 2 NO33
--
Net Ionic Equation:Net Ionic Equation:
CrOCrO44
-2-2
+ Pb+ Pb+2+2
PbCrOPbCrO44 (s)(s)
29. Net Ionic EquationsNet Ionic Equations
Try this one! Write the molecular, total ionic, and netTry this one! Write the molecular, total ionic, and net
ionic equations for this reaction: Silver nitrate reactsionic equations for this reaction: Silver nitrate reacts
with Lead (II) Chloride in hot water.with Lead (II) Chloride in hot water.
Molecular:Molecular:
Total Ionic:Total Ionic:
Net Ionic:Net Ionic: