Chem I/PreAP Chem I
Instructor: Mrs. Blakely
Name ___________________________________________________ Per. ___________ Date ______________
Gumdrop Reactions
Types of Chemical Reactions
So many chemical reactions occur in nature that it would be nearly impossible to
predict their products if it were not possible to place many of them into categories.
For this reason in 1st year Chemistry, you will learn about 5 main types of chemical
reactions.
Five basic types of reactions include:
Synthesis (combination or composition) reactions
Decomposition reactions
Single-replacement reactions
Double-replacement reactions
Combustion reactions
Using your notes on Types of Chemical Reactions, you will build
molecules/formula units with gumdrops, build a chemical equation,
then balance your chemical equation, and identify the type of reaction
that is represented.
The skeleton equation is provided for you.
Materials:
Cup of various colored gumdrops (Please do not eat these.)
Toothpicks
Whiteboard, eraser, and marker
Notes-Types of Chemical Reactions
Procedure:
1. Word Equation:
Magnesium and oxygen gas react to form magnesium
oxide.
Skeleton Equation:
Mg(s)
+ O2(g) - MgO(s)
Choose a color of gumdrop to represent Mg _________________.
Choose a color of gumdrop to represent O _________________.
Construct molecules/formula units using colored gumdrops to
represent each element and toothpicks to represent bonds. Place
the models on the white board. Draw any other equation symbols
needed to complete the chemical equation. These will include a
symbol in parentheses for the state of matter of each reactant and
product and an arrow to represent “yields” to complete your
chemical equation.
Record the Balanced Equation:
_____Mg(s)
+ _____O2(g)  _____MgO(s)
Identify the type of reaction: ________________________________
Follow the instructions given in #1 to complete each of the
following reactions.
2. Word Equation:
Sodium reacts with fluorine gas to form sodium fluoride,
which is added to municipal water supplies to help
prevent tooth decay.
Skeleton Equation:
Na(s)
+ F2(g) - NaF(s)
Choose a color of gumdrop to represent Na _________________.
Choose a color of gumdrop to represent F _________________.
Record the Balanced Equation:
_____Na(s)
+ _____F2(g)  _____NaF(s)
Identify the type of reaction: ________________________________
What type of molecule is fluoride in this equation?
_________________________________
3. Word Equation:
Solid magnesium reacts with hydrochloric acid to produce
magnesium chloride (a salt) and hydrogen gas.
Skeleton Equation:
Mg(s)
+ HCl(aq) - H2(g) + MgCl2(aq)
Choose a color of gumdrop to represent Mg _________________.
Choose a color of gumdrop to represent H _________________.
Choose a color of gumdrop to represent Cl _________________.
Record the Balanced Equation:
_____Mg(s)
+ _____HCl(aq)  _____H2(g) + _____MgCl2(aq)
Identify the type of reaction: ________________________________
4. Word Equation:
When an aqueous solution of potassium iodide is added to
an aqueous solution of lead(II) nitrate, the yellow
precipitate lead(II) iodide forms along with an aqueous
solution of potassium nitrate.
Skeleton Equation:
KI(aq)
+ Pb(NO3)2(aq) - PbI2(s) + KNO3(aq)
Choose a color of gumdrop to represent K _________________.
Choose a color of gumdrop to represent I _________________.
Choose a color of gumdrop to represent Pb _________________.
Choose a color of gumdrop to represent N _________________.
Choose a color of gumdrop to represent O _________________.
Record the Balanced Equation:
_____KI(aq)
+ _____Pb(NO3)2(aq)  _____PbI2(s) + KNO3(aq)
Identify the type of reaction: ________________________________
5. Word Equation:
When an electric current is passed through water, it will
decompose into hydrogen and oxygen gas.
Skeleton Equation:
H2O(l)
 H2(g) + O2(g)
Choose a color of gumdrop to represent H _________________.
Choose a color of gumdrop to represent O _________________.
Record the Balanced Equation:
_____H2O(l)  _____H2(g) + _____O2(g)
Identify the type of reaction: ________________________________
6. Word Equation:
The burning of propane results in the production of
carbon dioxide and water vapor.
Skeleton Equation:
C3H8(g)
+ O2(g)  CO2(g) + H2O(g)
Choose a color of gumdrop to represent C _________________.
Choose a color of gumdrop to represent H _________________.
Choose a color of gumdrop to represent O _________________.
Record the Balanced Equation:
_____C3H8(g) + _____O2(g)  _____CO2(g) + _____H2O(g)
Identify the type of reaction: ________________________________
Extension:
Predict the products of the following reactions and identify the
type of chemical reaction that occurs.
1. zinc(s) + sulfur(s)  _______________
type: ____________________
2. calcium(s) + sodium nitrate(g)  ________________ + _______________
type: __________________________