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Potassium Permangnate and Glycerin/Glycerol

Decomposition of Hydrogen Peroxide

Rates of Reaction

•Describe how the rate of a reaction can be measured

Identify factors that affect the rate of reaction

Analyse data on the rate of a reaction

KEYWORD: rateSTARTER : 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’?

The rate of a reaction is ‘the time taken for a product to form, or reactants to be used up’

Q. What do you understand by the term ‘rate of reaction’?

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 RateHow could you measure the rate of these reactions? Use your definition to help you.

REVIEW+magnesiumhydrochloric

acid + magnesiumchloride

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).

hydr

ogen

pro

duce

d (c

m3 )

time (seconds)10 20 30 40 50

10

20

30

40

50

60

70

00

x

y

Calculating rate of reaction from graphs

rate of reaction =

x

y

rate of reaction =20 s

45 cm3 = 2.25 cm3/s

The gradient of the graph is equal to the initial rate of reaction at that time

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

Collision Theory

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

POTENTIAL ENERGY DIAGRAM

Exothermic or Endothermic?

Endothermic or Exothermic?

Copy and Complete. What does A,B,C,D stands for?

Check For Understanding

Who Wants to be a Millionaire

Learning Target Log 7D & 7E

Please take out the learning target log. Write date and scale yourself

FACTORS AFFECTING RATE REACTIONS

Rate and Surface area

As we increase the surface area, we increase the rate of reaction

Why?

Watch video

http://ca.pbslearningmedia.org/resource/lsps07.sci.phys.matter.expldust/dust-explosion/

TPS

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?

VIDEO FEEDBACK

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.

Rate and surface area

The bigger the surface area, the more particles are exposed and so can react.

CuSO4 • 5H2O = copper sulfate pentahydrate

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.

CuSO4 • 5H2O + energy CuSO4 + 5H2O

water vapor

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

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.

Learning Target Log

Please take out the learning target log and rate yourself

CASE STUDY

“Would You Supersize My Cancer Please? A Case Study Exploring Chemicals in the News”

Case Study

RECIPROCAL TEACHING:Prediction

◦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)

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.

HOMEWORK: Research Writing assignment

Please respond to the questions at the end of the case study

Due in 3days

Watch Video

Animation of a case of an explosion

Why should we care about rate reaction?

Rate and Temperature

As we increase the temperature, we increase the rate of reaction.

Rate and temperature

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 Catalysts

Rate and CatalystsA 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?

Learning Target Log/Submit

Please take out the learning target log and rate yourself then submit

Check for Understanding

Lets Play Who wants to be a Millionaire Game

Concept Map

Complete the concept map

Mind Map/Matching Game

Complete the mind map/matching game

Exit Slip

Complete the exit slip

Learning Target Log

Please take out your learning target log and rate yourself

Coming Up Next

Exploring the Importance of a CatalystInhibitorsPoisoning a Catalyst Industrial Uses of a Catalyst