Today’s class agenda
• 1. Trigger(4 min)
• 2. Central question(4 min)
• 3. Workshop and activities (35 min)
• 4. Conclusions (5 min)
• PLEASE NO HOODS
Let’s live in a changing
rate
Students will follow the instructions given during the
activity:
In the first moment, students will follow the instructions
without any limitations.
In the second moment teacher is going to add a limitation, the
idea is to identify the effect of this limitation on the activity
performance.
CENTRAL GOAL
To know how to
determine the reaction
rate formula
Workshop activity
• Get ready a piece of paper and a pen
• Write the complete name and class on the paper sheet
• Solve the exercises purposed during the class.
• Hand the paper sheet to the teacher at the end of the
class.
NOTE:
When you finish hand the exercise in a piece of paper
to the teacher.
WHAT CONCENTRATION
(MOLARITY) IS?
WHY IS IT IMPORTANT IN
CHEMICAL KINETICS?
OF REACTION
Representation of how fast a species is consumed (-) or formed (+) over
time. The unit is
𝑴 𝒐𝒍 𝑴𝒐𝒍 𝒂𝒓 𝑴 −𝟏
= = 𝐨𝐌 𝐱 𝒔
𝑳𝒙𝒔 𝒔 𝒔
Reactants are being Products are being
CONSUMED FORMED
Rate of change and Rate of reaction
Rate of change
Specified for each of the reactants
(consumed) or products (formed). Use
differences of concentration and time
and stoichiometry
Rate of reaction
Rate of the whole reaction. Calculated
with the rate of change.
1. Write the expression of rate of reaction for the following chemical reaction:
CH4(g) + O2 (g) H2O (g) + CO2 (g)
2. HOW DO YOU THINK CHEMIST GET TO THIS GRAPHS?
3. Write the expression of rate of reaction for the following chemical
reaction:
H2(g) + 2 ICl (g) I2 (g) + 2 HCl (g)
4. HOW IS THE RATE OF CHANGE OF ICl AND H2
BETWEEN 3 SEC AND 5 SEC?
5. Write the expression of rate of reaction for the
following chemical reaction:
xample
Example
Example
6. Applied exercise
A scientist conducts an experiment to determine the rate of the following
reaction:
N2(g) + O2(g) → 2NO(g)
If the initial concentration of N2 was 0.500 M and the concentration of N2
was 0.450 M after 0.100 s, what is the rate of the reaction?
Using the previous rate of reaction, calculate the rate of NO formation?
Hand the paper sheet to the teacher at the end of the class.
