o In a Synthesis reaction the more complex product will be
formed from the reactants. Then another type of synthesis reaction is when an
element and a compound combine to form a new compound. If you count the atoms
and numbers this will make it easier to identify the type of reaction. The
reactants can be elements or compounds. A compound is produced from the
reaction. For a synthesis reaction both electrons stay with the products which
give you a charged ion.
1. Iron Sulfide would be 8 Fe + S8 = 8 FeS. The
Iron and the sulfide are 2 elements that combine to create a compound.
2. Water would be 2 H2 (g) + O2 (g) =
2C02 (g). Water is made with the two elements Hydrogen and Oxygen.
This reaction is exothermic and releases energy when being made.
Ammonia would be 3 H2(g) + N2(g) ? 2
NH3(g). Ammonia is made up of the two elements Hydrogen and
Nitrogen. This compound is formed using the Haber process. Which makes
Fertilizers, dyes, explosives, and more.
reaction 14 sentences
o A Decomposition reaction is a single substance that has
been broken down into two or more simpler substances. The simpler substances
can be compounds or elements. The compound is broken into smaller chemical
species. Decomposition involves break down into smaller molecules.
Decomposition is the opposite of Synthesis reaction. The reactants are made up
of when a single reactant produces multiple products. This reaction is required
to have a source of energy so it can break apart the bonds of the compounds.
1. Carbonic Acid is H2CO3 which is
used to make soft drinks. The decomposition takes place when the acid breaks
down to make carbon dioxide and water. The whole equation is 2H2O=2H2
2. Water is H2O and it
breaks down to produce Oxygen and Hydrogen gases. The equation is 2H20=2H2O2.
3. Calcium oxide involves the decomposition of
Calcium Carbonate by heating it. The equation is CaCO3(s)=CO2(g).
reaction 12 sentences
o A combustion reaction requires Oxygen that combines with
another compound to form Carbon Dioxide and water. A combustion reaction will
always have carbon dioxide and water. The reaction has a compound that is
reacted to produces a heat or new compound. The reactants of a combustion reaction
are always carbon dioxide and oxygen. The products are always going to be
carbon dioxide and water. Since Oxygen is more electronegative then carbon the
electrons in carbon dioxide are shared equally. Combustion reactions are always
you burn wood it has to have oxygen and then the heat is made.
of Coal is C+02=CO2. This produces energy in the form of
fireworks are lit the chemicals react with the oxygen in the air to produce the
heat and light made from the firework.
displacement reaction 13 sentences
o A single displacement reaction is when one element is
substituted for another element in a compound. One of the reactants is an
element and the other one is a compound. The starting materials are always going
to be pure elements. Then once you know what element can be replaced you can
find the product of the reaction.
1. Potassium reacts with water. Then Hydrogen
and Potassium Hydroxide is set free. Then this equation was made 2K + 2H2O=2K0H+H2.
2. Zinc reacts
with Sulfuric acid to release Hydrogen gas. Which makes the equation Zn+H2SO4=ZnSO4+H2.
3. A real
life example is the statue of liberty. The reaction causes the Iron to convert
to copper. Therefor that led to the Iron begin to rust. Which led to the statue
of liberty being replaced later.
displacement reaction 12
o A double displacement reaction is when 2 ionic compounds
are exchanged making 2 new compounds. The reaction they have together is like
swapping cations or anions but never both. When the cations and anions switch
between the 2 reactants they form a product. The electrons are either positive
ion or a negative ion. There are 3 types of double displacement they are
precipitation, gas producing, and weak electrolytes.
1. Silver is traded for a nitrite ion for the
sodium chloride ion. The equation is AgNO3+NaCl=AgCl+NO3.
2. A real
life example would be baking cupcakes. When you make cupcakes you put baking
soda and then that reacts to the acidic substances. Without it the reaction we
wouldn’t be able to make cupcakes.
Hydrogen Chloride mixed with Sodium oxide creates table salt. The equation is
– reduction reaction 14 sentences
o A chemical reaction involves the transfer of electrons
between 2 things. You can tell if there is a transfer of electrons by the
oxidation number between the product and reactant. When an atom gains electrons
it’s reduced. Then when the atom is lost its oxidized. The reactants that bring
oxidation are called the oxidizing agent. Once the oxidation number changes
from reactant you will know the product,
dioxide is reduced to sugar and water is oxidized to oxygen. The equation is
When natural gas is burned that is an example of Oxidation-reduction reaction.
Methane is oxidized to become carbon dioxide. The equation is CH4+2O2=CO2+2H2O.
Magnesium atom is oxidized to a magnesium ion. The equation Mg-2e=Mg2.