Naming and Formula Quiz # 2
1)Ca(ClO3)2
7) Phosphoric Acid
2)Li2SO3
8)Barium Carbonate
3)Li(C2H3O2)
9)Fe3(PO4)2
4)Calcium Sulfate 10)Rubidium Dichromate
5)MnSO4 .5 H2O
6)Copper (I) Perchlorate
Chemical Reactions
•Chemical reaction, substances join together to
form new substances
•The original substances present are called
REACTANTS
•The new substances formed are called
PRODUCTS
Additional Symbols
in Chemical Reactions
•+ used to separate reactants or products
•(s) means chemical is in solid state
•(l) means chemical is in liquid state
•(g) means chemical is in gas state
•(aq) means aqueous which means the
chemical is dissolved in water
Other Symbols
• means something is added to
the reaction
•Usually this is heat
• Pt
means a catalyst (Pt) is
added
Skeleton Equations
•Skeleton (Formula) Equation- the rough form
of an equation
•It only shows the framework for the chemical
reaction
•Example: Fe + Cl2  FeCl3
•Question Why is Chlorine written as Cl2?
Diatomic Molecules
• Diatomic Molecules occur in nature
• They are shown as single atoms because
the molecules formed are more stable than
the individual atoms
• Diatomic Molecules are Hydrogen,
Nitrogen, Oxygen, Fluorine, Chlorine,
Bromine, and Iodine
• They are written as H2, N2, O2, F2, Cl2, Br2, I2
Write Skeleton Equations/Balance
Equations
• Solid Sodium metal reacts with Oxygen gas to
form solid Sodium Oxide
• Solid sulfur reacts with Fluorine gas to form
gaseous Sulfur Hexafluoride when heated
• Nitrogen reacts with Hydrogen to form Ammonia
(NH3) gas. Heat is required.
Write Skeleton Equations
• Solid Magnesium metal reacts with Chlorine
gas to form solid Magnesium Chloride.
•Aqueous Silver Nitrate reacts with aqueous
Sodium Chloride to form solid Silver Chloride
and aqueous sodium nitrate
Write the Skeleton Formula for the following
Liquid Potassium Permanganate reacts
with gaseous Hydrogen Chloride to
produce aqueous potassium chloride and
aqueous Manganese (II) Chloride and liquid
water and chlorine gas.
•**Remember that the diatomic elements
(Mr. BrINClHOF) appear with a subscript of
two when alone
Practice
•
Boron sulfide reacts violently with water to form
dissolved boric acid (H3BO3) and hydrogen sulfide
gas.
• When liquid phosphorus trichloride is added to
water, it reacts to form aqueous phosphorous
acid (H3PO3) and aqueous hydrochloric acid (HCl).
Practice Writing Skeleton Equations
• Solid Carbon reacts with Chlorine gas to form
solid Carbon Tetrachloride
• Solid Magnesium metal reacts with solid Zinc
Carbonate to form solid Magnesium Carbonate
and solid Zinc metal
Write and balance the following
equations
•When Isopropanol Alcohol (C3H8O) is burned in
excess oxygen it produces carbon dioxide and
water.
•When aqueous sodium hydroxide reacts with
sulfuric acid (H2SO4), aqueous sodium sulfate
and water are produced.
Write out the Skeleton Equation and
balance
• Gaseous hydrogen reacts with gaseous chlorine
to form aqueous hydrogen chloride
• Carbon monoxide gas reacts with gaseous
oxygen to form solid carbon dioxide
Types of Reactions
•There are five general types of reactions:
•Synthesis
•Decomposition
•Single Displacement
•Double Displacement
•Combustion
1) Synthesis Reactions
•Synthesis reactions are also called combination
reactions
•A synthesis reaction occurs when two substances
combine to form a new compound
Synthesis Reaction Continued
•The general form of a synthesis reaction is:
• A + B  AB
•Substance “AB” is the only substance formed
Examples of Synthesis Reactions
•2 Mg (s) + O2 (g)  2 MgO (s)
•Fe (s) + Cl2 (g)  FeCl2 (s)
•U (s) + 3 F2 (g)  UF6 (g)
Practice
Write the synthesis reaction for the following
•The synthesis of KCl
•The synthesis of barium fluoride
2) Decomposition Reaction
•In decomposition reactions, one substance
breaks down (decomposes) into two or more
simpler substances
Decomposition Reactions Cont.
• General Form of Decomposition Reaction
(Binary):
•
AB  A + B
Examples of
Decomposition Reactions
•2 HgO (s)  2 Hg (l) + O2 (g)
•Ca(OH)2  CaO (s) + H2O (g)
•H2SO4 (aq)  SO3 (g) + H2O (l)
• 1.
The decomposition of ammonia (NH3)
•2. The decomposition of Aluminum Oxide
•3. The decomposition Iron (III) Chloride
Write Correct Balance Equations
•
The decomposition of magnesium oxide
• The decomposition of hydrogen peroxide (H2O2)
into oxygen and water
• The decomposition of Mg(OH)2 into magnesium
oxide and water
• The decomposition of NaHCO3