view quick lab
DESCRIPTION
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. KEYWORD: rate. STARTER : Put these in order from fastest to slowest. - PowerPoint PPT PresentationTRANSCRIPT
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Warm Up:How does Pharmaceutical Chemist determined on the label, how often and when to take a pill?
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View Quick LAB
Potassium Permangnate and Glycerin/Glycerol
Decomposition of Hydrogen Peroxide
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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
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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
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Do we always get a reaction?
2 VOLUNTEERS PLEASE!
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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_____ .
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Measuring RateHow could you measure the rate of these reactions? Use your definition to help you.
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REVIEW+magnesium hydrochloricacid + magnesium
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).
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hydr
ogen
pro
duce
d (c
m3 )
time (seconds)10 20 30 40 50
10203040506070
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
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Graphs tell a story. Sketch these two graphs and write a sentence to explain what the graph shows you.
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PP Question:
Rate = amount of product produce / times takes = 5 / 25
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Collision Theory
Please take out a new note sheets for this. Title it……
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Collision theory
All substances are made of atoms or molecules.
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Collision theory
All substances are made of atoms or molecules. For a reaction to take place the particles of different substances must collide.
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Collision theory
All substances are made of atoms or molecules. For a reaction to take place the particles of different substances must collide.
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Collision theory
All substances are made of atoms or molecules. For a reaction to take place the particles of different substances must collide.
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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.
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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
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POTENTIAL ENERGY DIAGRAM
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Exothermic or Endothermic?
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Endothermic or Exothermic?
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Copy and Complete. What does A,B,C,D stands for?
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Check For Understanding
Who Wants to be a Millionaire
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Learning Target Log 7D & 7E
Please take out the learning target log. Write date and scale yourself
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FACTORS AFFECTING RATE REACTIONS
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Rate and Surface area
As we increase the surface area, we increase the rate of reaction
Why?
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Watch video
http://ca.pbslearningmedia.org/resource/lsps07.sci.phys.matter.expldust/dust-explosion/
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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?
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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.
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Rate and surface area
The bigger the surface area, the more particles are exposed and so can react.
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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
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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.
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Rate and Concentration
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Rate and concentration
As we increase the concentration, the rate of reaction increases.
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Rate and concentration
As we increase the concentration, the rate of reaction increases.
Why?
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Rate and Concentration
As we increase the concentration, there are more particles in the same volume so the greater chance of a collision.
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Learning Target Log
Please take out the learning target log and rate yourself
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CASE STUDY
“Would You Supersize My Cancer Please? A Case Study Exploring Chemicals in the News”
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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)
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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.
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HOMEWORK: Research Writing assignment
Please respond to the questions at the end of the case study
Due in 3days
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Watch Video
Animation of a case of an explosion
Why should we care about rate reaction?
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Rate and TemperatureAs we increase the temperature, we
increase the rate of reaction.
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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.
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Rate and Temperature
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Rate and Catalysts
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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?
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Learning Target Log/Submit
Please take out the learning target log and rate yourself then submit
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Check for Understanding
Lets Play Who wants to be a Millionaire Game
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Concept Map
Complete the concept map
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Mind Map/Matching Game
Complete the mind map/matching game
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Exit Slip
Complete the exit slip
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Learning Target Log
Please take out your learning target log and rate yourself
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Coming Up Next
Exploring the Importance of a CatalystInhibitorsPoisoning a Catalyst Industrial Uses of a Catalyst