Chemical Reaction Factors
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Chemical Reactions
Inquiry Lab: Alka-Seltzer in water
Does the temperature makes a difference
in the reaction?
Which temperature did the reaction went
by faster?
Why do you think?
Why?
As temperature increases, Kinetic energy
increases
Then particles bump/collide with each
other more constantly thus making the
reaction faster
Concentration
Which concentration of the hydrochloric
acid did the magnesium metal reacted
faster, 3M or 1M?
Why do you think?
What will increase the rate/speed
of a chemical reaction?
Anything that
Anything that
increase the contact
/
collision of reaction.
collision of reaction.
Chemical reactions can happen at
Chemical reactions can happen at
different
different
rates.
rates.
Which reactions occurs so quick? So slow?
Which reactions occurs so quick? So slow?
Examples:
Examples:
Explosion? (in seconds)
Explosion? (in seconds)
Decaying of leaves? (in months)
Decaying of leaves? (in months)
Digestion of food (hours) or metabolism?
Digestion of food (hours) or metabolism?
Factors that affect the rate of
reaction
Factors Affecting Rate (speed)
of reaction
1.Temperature
1.Temperature
–
Relationship between temperature and
reaction rate:
direct
–
As temp.
As temp.
increases
increases
, reaction rate
, reaction rate
increases
increases
–
Why?
Why?
–
Kinetic energy
Kinetic energy
increases as particles move
increases as particles move
faster thus number of
faster thus number of
collision between
collision between
reactants
reactants
increases causing the reaction to
increases causing the reaction to
increase.
increase.
Temperature
Real life application?
Why do you need to store food in the
refrigerator? Milk or cheese
To delay reaction (spoiling)
At room temperature or higher, bacteria
will react with the food faster
Phetlab:
Phetlab:
https://phet.colorado.edu/en/simulation/legacy/rea
https://phet.colorado.edu/en/simulation/legacy/rea
ctions-and-rates
ctions-and-rates
2.
2.
Concentration
Concentration
Demonstrate:
Demonstrate:
HCl in different concentrations + Magnesium ribbon
HCl in different concentrations + Magnesium ribbon
Which reaction will proceed faster 1M HCl or 3M HCl?
Which reaction will proceed faster 1M HCl or 3M HCl?
Usually, the
Usually, the
greater
greater
the amount of
the amount of
substances in reactants, the
substances in reactants, the
faster
faster
the
the
reaction.
reaction.
Checking for understanding 1
Choose the correct answer.
1. As the temperature increases, the rate of
reaction (increases ,decreases)
2. At higher temperature, Kinetic energy
(increases, decreases) thus collision frequency
increases.
3. As the concentration increases, number of
particles participating in the reaction is (more,
less) and the collision between particles
(decreases, increases).
3.
3.
Surface Area
Surface Area
Example: whole potato vs potato in boiling water
Example: whole potato vs potato in boiling water
Demo
Demo
: which will have faster reaction? Why?
: which will have faster reaction? Why?
Alka-Seltzer powder vs whole
Alka-Seltzer powder vs whole
The
The
greater
greater
the surface area between
the surface area between
reactants is in contact , the
reactants is in contact , the
more
more
collision
collision
will occur and thus
will occur and thus
increasing
increasing
rate of
rate of
reaction.
reaction.
The
The
smaller
smaller
the pieces the greater the
the pieces the greater the
surface area
surface area
Affecting speed of reaction
4. Catalyst
4. Catalyst
–
Are substances that
Are substances that
speed up
speed up
a chemical
a chemical
reaction without being consumed.
reaction without being consumed.
–
It is
It is
recovered
recovered
after the reaction
after the reaction
(Example: enzymes ( biological substances)
(Example: enzymes ( biological substances)
(Insulin – turns sugar into energy)
(Insulin – turns sugar into energy)
How does it affect the reaction?
How does it affect the reaction?
It changes the
It changes the
activation energy
activation energy
by creating a
by creating a
n
n
alternate route
alternate route
to get to the product
to get to the product
.
.
Effect of catalyst in activation
energy?
Inhibitor
Inhibitor
–
Substances that
Substances that
prevent or slow
prevent or slow
down a
down a
chemical reaction.
chemical reaction.
–
It delays or stops the reaction to occur
It delays or stops the reaction to occur
–
Example: medicines that stop pain
Example: medicines that stop pain
Checking for understanding 2
Identify:
Identify:
1. What is the name of a substance that speeds up a
1. What is the name of a substance that speeds up a
chemical reaction?
chemical reaction?
2. what is the name of the substance that slows down a
2. what is the name of the substance that slows down a
chemical reaction?
chemical reaction?
True or false. Explain if answer is false
True or false. Explain if answer is false
3. The rate of reaction
3. The rate of reaction
increases
increases
as surface area
as surface area
decreases.
decreases.
4. A catalyst speeds up a reaction by creating an
4. A catalyst speeds up a reaction by creating an
alternate
alternate
route for activation energy.
route for activation energy.
5. The smaller the pieces of the particles, the
5. The smaller the pieces of the particles, the
smaller
smaller
the
the
surface area is in contact with the other reactant.
surface area is in contact with the other reactant.
Watch the video:
Factors affecting rate of reaction
Factors affecting rate of reaction
https://www.youtube.com/watch?v=OttRV
https://www.youtube.com/watch?v=OttRV
5ykP7A
5ykP7A
Explore the impact of temperature, concentration, catalysts, and surface area on the rate of chemical reactions. Learn how these factors influence reaction speed through real-life applications and experiments such as Alka-Seltzer in water and magnesium ribbon with different HCl concentrations.
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Presentation Transcript
Inquiry Lab: Alka-Seltzer in water Does the temperature makes a difference in the reaction? Which temperature did the reaction went by faster? Why do you think?
Why? As temperature increases, Kinetic energy increases Then particles bump/collide with each other more constantly thus making the reaction faster
Concentration Which concentration of the hydrochloric acid did the magnesium metal reacted faster, 3M or 1M? Why do you think?
What will increase the rate/speed of a chemical reaction? Anything that increase the contact/ collision of reaction. Chemical reactions can happen at different rates. Which reactions occurs so quick? So slow? Examples: Explosion? (in seconds) Decaying of leaves? (in months) Digestion of food (hours) or metabolism?
Factors that affect the rate of reaction Temperature Concentration Catalyst/ inhibitor Surface area
Factors Affecting Rate (speed) of reaction 1.Temperature Relationship between temperature and reaction rate: direct As temp. increases, reaction rate increases Why? Kinetic energy increases as particles move faster thus number of collision between reactants increases causing the reaction to increase.
Temperature Real life application? Why do you need to store food in the refrigerator? Milk or cheese To delay reaction (spoiling) At room temperature or higher, bacteria will react with the food faster
Phetlab:https://phet.colorado.edu/en/simulation/legacy/rea ctions-and-rates
2. Concentration Demonstrate: HCl in different concentrations + Magnesium ribbon Which reaction will proceed faster 1M HCl or 3M HCl? Usually, the greater the amount of substances in reactants, the faster the reaction.
Checking for understanding 1 Choose the correct answer. 1. As the temperature increases, the rate of reaction (increases ,decreases) 2. At higher temperature, Kinetic energy (increases, decreases) thus collision frequency increases. 3. As the concentration increases, number of particles participating in the reaction is (more, less) and the collision between particles (decreases, increases).
3. Surface Area Example: whole potato vs potato in boiling water Demo: which will have faster reaction? Why? Alka-Seltzer powder vs whole The greater the surface area between reactants is in contact , the more collision will occur and thus increasing rate of reaction. The smaller the pieces the greater the surface area
Affecting speed of reaction 4. Catalyst Are substances that speed up a chemical reaction without being consumed. It is recovered after the reaction (Example: enzymes ( biological substances) (Insulin turns sugar into energy) How does it affect the reaction? It changes the activation energy by creating an alternate route to get to the product.
Effect of catalyst in activation energy?
Inhibitor Substances that prevent or slow down a chemical reaction. It delays or stops the reaction to occur Example: medicines that stop pain
Checking for understanding 2 Identify: 1. What is the name of a substance that speeds up a chemical reaction? 2. what is the name of the substance that slows down a chemical reaction? True or false. Explain if answer is false 3. The rate of reaction increases as surface area decreases. 4. A catalyst speeds up a reaction by creating an alternate route for activation energy. 5. The smaller the pieces of the particles, the smaller the surface area is in contact with the other reactant.
Watch the video: Factors affecting rate of reaction https://www.youtube.com/watch?v=OttRV 5ykP7A
