Let
’s explore
Let’s
explore what
what you
you know!
know!
•
Draw a microscopic representation for the reactants and the products in each of these
chemical equations. Use the following symbolism to complete the task:
Chemical Reactions
Chemthreads
W=
•
•
X=
Y=
Z=
X+Y
XY
2 WZ
W2 + 2 Z
2 W + 2 YZ
2 WZ + Y2
XY + WZ
XZ + WY
Write the chemical equation corresponding to each of these chemical reactions using the
following symbolism:
=X
=Y
=Z
=W
1
3
2
4
Choose the chemical equation that best describes the chemical reaction
depicted in these microscopic representations:
a)
3 Z2 + 6 W
6 WZ
a)
2 X + 3 Y2
2 XY3 + Y2
b)
Z2 + 2 W
2 WZ
b)
X + 2 Y2
XY3 + Y
c)
2Z+W
WZ
c)
2 X + 3 Y2
2 XY3
d)
3Z+6W
6 WZ
d)
7 Y2 + 4 X
4 XY3 + Y2
Let
’s learn
Let’s
learn about
about Chemical
Chemical Equations
Equations!
•
Analyze the following microscopic representations of a chemical reaction and complete
the table below:
Reactants
Product
Symbol
Chemical
Formula
Number of
particles
•
Identify the smallest proportion in which the reactants react to give products, i.e. find the
smallest number of reactant molecules which will react to form the smallest number of
product molecules:
Chemical Reactions
ChemThreads
Reactants
Product
+
•
Analyze the following chemical equation and complete the table:
Reactants
Product
2 Sr + O2
2 SrO
Symbol
Chemical
Formula
Sr =
O=
•
Using the information above, draw a microscopic representation for this chemical
reaction starting with 4 atoms of Sr and 2 molecules of O2.
•
Your turn! Draw the microscopic representations for this chemical reaction starting with
6 atoms of Sr and 3 molecules of O2.
Let
’s learn
Let’s
learn about
about Chemical
Chemical Equations!
Equations!
•
Analyze both the microscopic representation of the reactants and the chemical equation
describing this chemical reaction:
=Y
=W
?
•
2 WY4
W2+ 4 Y2
Let’s use the chemical equation to complete the following table and predict the
microscopic representation of the products:
Reactants
Product
Chemical
Formula
Products
ChemThreads
Symbol
Proportion
of reactants
and products
Number of
particles
•
Your turn! Analyze both the microscopic representation of the reactants and the
chemical equation describing this chemical reaction:
=X
Chemical Reactions
?
•
2 X + Y2
=Y
2 XY3
:
Fill in the following table and predict the microscopic representation of the products
Reactants
Chemical
Formula
Symbol
Proportion
of reactants
and products
Number of
particles
Product
Products
Let
’s learn
Let’s
learn about
about Chemical
Chemical Equations!
Equations!
•
Analyze both the microscopic representation of the products and the chemical
equation describing the chemical reaction:
?
•
=Z
=Y
=X
Z + 2 XY
Y2Z + X2
Let’s use the chemical equation to complete the following table and predict the
microscopic representation of the reactants:
Reactants
Product
Chemical
Formula
Reactants
ChemThreads
Symbol
Proportion
of reactants
and products
Number of
particles
•
Your turn! Analyze both the microscopic representation of the products and the
chemical equation describing the chemical reaction:
=W
Chemical Reactions
?
•
=X
WZ + XY
=Y
=Z
WX+ YZ
Fill in the following table and predict the microscopic representation of the reactants:
Reactants
Chemical
Formula
Symbol
Proportion
of reactants
and products
Number of
particles
Product
Reactants
Let
’s learn
Let’s
learn about
about Limiting
Limiting Reactant!
Reactant!
•
Analyze the following microscopic representation of a chemical reaction and
complete the table below:
Reactants
Product
Symbol
Chemical
Formula
•
Analyze the difference between this chemical reaction and the previous ones:
Difference
ChemThreads
•
Reactants
Product
+
•
Analyze the following chemical equation and fill in the table:
Reactants
Product
2 Al + 3 Br2
2 AlBr3
Symbol
Chemical
Formula
•
Chemical Reactions
Identify the smallest proportion in which the reactants react to give products, i.e. find
the smallest number of reactant molecules which will react to form the smallest
number of product molecules:
Al=
Using the information above, draw the microscopic representations associated to
this chemical reaction starting with 5 atoms of Al and 6 molecules of Br2. Identify
the limiting reactant.
reactant
Limiting Reactant
•
Br =
Your turn! Draw the microscopic representations associated to this chemical
reaction starting with 3 atoms of Al and 9 molecules of Br2 and identify the
limiting reactant.
reactant
Limiting Reactant
Let
’s apply
Let’s
apply what
what we
we learned!
learned!
•
Draw a microscopic representation for the reactants and the products in each of these
chemical equations. Use the following symbolism to complete the task:
W=
X2 + 3 W2
Chemical Reactions
ChemThreads
2 XYZ
•
X=
Y=
Z=
2 XW3
XZ2 + WY
WZ2 + XY
2 XY + Z2
2 WZ + Y2
2 WY + Z2
Write the chemical equations corresponding to the chemical reactions below using the
following symbolism:
=W
=X
=Y
1
3
2
4
=Z
Let
’s apply
Let’s
apply what
what we
we learned!
learned!
•
Choose the chemical equation that best describes the chemical reaction depicted in
these microscopic representations:
a)
b) 4 XY3
2 X2 + 12Y
b) W2 + X2
2 WX
c)
2X+Y
c)
2 WX + W2
X2 + 6 Y
d) W2 + X2
XY3
XY3
d) 2 XY3
Chemical Reactions
ChemThreads
•
6 W2 + 4 X 2
4 WX + 2 W2
X2 + Y
a)
2 W2 + X2
2 WX + W2
Predict the microscopic representations of the reactants or the products for the following
chemical reactions:
2 W2 Y
X2 + 3 Y2
4 W + Y2
2 XY3
2 X + 6 YZ
X2 + 2 WZ
2 XY3 + 6 Z
W2 + 2 XZ