Warm Up:
How does Pharmaceutical Chemist determined on
the label, how often and when to take a pill?

Potassium Permangnate and
Glycerin/Glycerol

Decomposition of Hydrogen Peroxide
View Quick LAB
Rates of Reaction
•Describe how
the rate of a
reaction can be
measured
Identify factors Analyse data on
that affect the the rate of a
rate of
reaction
reaction
KEYWORD: rate
STARTER : Put these in order from
fastest to slowest
Rotting Fruit Firework Baking a cake
Cooking an egg rusting of nail
What do we mean by ‘rate’?
Q. What do you understand
by the term ‘rate of reaction’?
The rate of a reaction is ‘the time
taken for a product to form, or
reactants to be used up’
Rate = amount of product produced (reactants used up) / time taken
Do we always get a reaction?
2 VOLUNTEERS
PLEASE!
REVIEW
Measuring the rate at which
____1___ are used up or ____2__
are made are two ways of measuring
the ___3___ of a chemical reaction.
An example of a reaction that
happens quickly is a ____4_______
. A reaction that happens slowly is
_____5_____ .
Measuring Rate
How could you measure the rate of
these reactions? Use your definition to
help you.
magnesium
+
hydrochloric
REVIEW
 magnesium
acid
chloride
+ hydrogen
Q. How could you measure the rate of the
reaction? Include the units you would use?
The amount of hydrochloric acid used up
(cm3/min).
The amount of magnesium chloride produced
(g/min).
The amount of hydrogen product (cm3/min).
Calculating rate of reaction from
graphs
70
hydrogen produced (cm3)
60
x
50
rate of reaction =
40
y
x
30
y
20
10
0
0
10
20
time (seconds)
30
40
50
The gradient of the graph is equal to the initial
rate of reaction at that time
3 =
45
cm
2.25 cm3/s
rate of reaction =
20 s
Graphs tell a story.
Sketch these two graphs and write a sentence to
explain what the graph shows you.
PP Question:
Rate = amount of product produce / times takes
= 5 / 25

Please take out a new note sheets for
this. Title it……
Collision Theory
All substances are made of atoms or
molecules.
Collision theory
All substances are made of atoms or
molecules. For a reaction to take place the
particles of different substances must
collide.
Collision theory
All substances are made of atoms or
molecules. For a reaction to take place the
particles of different substances must
collide.
Collision theory
All substances are made of atoms or
molecules. For a reaction to take place the
particles of different substances must
collide.
Collision theory
All substances are made of atoms or
molecules. For a reaction to take place the
partciles of different substances must
collide. The more collisons between
particles in a given time, the faster
the reaction.
Collision theory
Not all collisions result in a reaction.
 For a collision to be successful, the
molecules must have a minimum amount
of energy called the ACTIVATION ENERGY
 AND the particles must have the correct
orientation

Collision theory
POTENTIAL ENERGY DIAGRAM
Exothermic or Endothermic?
Endothermic or Exothermic?
Copy and Complete. What does
A,B,C,D stands for?

Who Wants to be a Millionaire
Check For Understanding

Please take out the learning target log.
Write date and scale yourself
Learning Target Log 7D & 7E
FACTORS AFFECTING RATE
REACTIONS
As we increase the surface area, we
increase the rate of reaction
Why?
Rate and Surface area

http://ca.pbslearningmedia.org/resource/l
sps07.sci.phys.matter.expldust/dustexplosion/
Watch video

Why is sugar powder so much more
combustible when it is dispersed?

Can you think of another substance that is
not combustible until it is airborne in tiny
droplets or particles?
TPS




Many fine solids, like sugar powder, are
dangerous in their dust form. As a dust, the
surface area of a material is high.
In addition, when dust is airborne, the particles
are surrounded by oxygen. As a result,
combustion can happen at a very rapid rate.
The rapid combustion can lead to an explosion if
the resulting heat and gas cannot dissipate
quickly enough.
Dust explosions are a serious hazard in many
industries, and extreme care must be taken in
factories to control dust and to prevent ignition.
Dust from wheat, corn, wood, plastic, and even
metals can produce dangerous combustion
reactions.
VIDEO FEEDBACK

The bigger the surface area, the more
particles are exposed and so can react.
Rate and surface area
CuSO4 • 5H2O = copper sulfate pentahydrate
water vapor 
CuSO4 • 5H2O + energy  CuSO4 + 5H2O
If you heat copper sulfate
pentahydrate crystals, they
will give off water molecules
into the air and become
anhydrous copper sulfate.
However, if the crystals are
large, lots of water molecules
are trapped deep inside the
crystals, so they can’t escape
into the air as easily.
If you grind the pretty blue
crystals up with a mortar &
pestle, they will turn into a
powder.
Now, the copper sulfate is made of
smaller particles, so it has more
surface area.
Now, it will be easier for H2O molecules to escape from the crystals and
fly into the air as water vapor.
Rate and Concentration

As we increase the concentration, the rate
of reaction increases.
Rate and concentration

As we increase the concentration, the rate
of reaction increases.
Why?
Rate and concentration

As we increase the concentration, there
are more particles in the same volume so
the greater chance of a collision.
Rate and Concentration

Please take out the learning target log
and rate yourself
Learning Target Log

“Would You Supersize My Cancer
Please? A Case Study Exploring
Chemicals in the News”
CASE STUDY
 RECIPROCAL
 Prediction
TEACHING:
◦ Please predict what you think the reading may
be about. Think about what is going to happen
by asking questions like a detective might do.

Question as you go
◦ Please generate questions as they listen and
read. Please note that there are three levels of
questions:
 Right-There questions (answer in the text)
 Between-the-lines questions (inference needed)
 Critical Thought questions (require your opinion)
Case Study
 Clarify
◦ As you listen and read, remind to ask yourself what
words and phrases that are unclear to you. These
clarifications may take the form of the following
questions.
 How do you pronounce that?
 What does the word mean?
 I think the author is saying…
 I'm guessing 'pie-in-the-sky' means…
 Summarize
◦ Please write down and summarize verbally by read it
aloud to your small group.

Please respond to the questions at the
end of the case study

Due in 3days
HOMEWORK: Research Writing
assignment

Animation of a case of an explosion

Why should we care about rate reaction?
Watch Video
Rate and Temperature

As we increase the temperature, we
increase the rate of reaction.

The increased speed of the particles mean
that collisions occur more often in a
certain time, and it is more likely that a
collision will result in the particles
reacting.
Rate and temperature
Rate and Temperature
Rate and Catalysts
Rate and Catalysts
A catalyst provides an alternative route
with a lower activation energy barrier.
 At the end of the reaction the catalyst is
unchanged.
 Inhibitor is a substance that interferes
with the action of a catalyst. Examples?


Please take out the learning target log
and rate yourself then submit
Learning Target Log/Submit

Lets Play Who wants to be a Millionaire
Game
Check for Understanding

Complete the concept map
Concept Map

Complete the mind map/matching game
Mind Map/Matching Game

Complete the exit slip
Exit Slip

Please take out your learning target log
and rate yourself
Learning Target Log
Exploring the Importance of a Catalyst
 Inhibitors
 Poisoning a Catalyst
 Industrial Uses of a Catalyst

Coming Up Next