chemical kinetics: factors affecting reaction rates
TRANSCRIPT
CHEMICAL KINETICS:
FACTORS AFFECTING REACTION
RATES
Experiment 2
Group 1 :
Catorce, Mariel
Dava, Angelo
Eduria, Johann
Mamalayan, John Renz
Catubig, Christian
Submitted to:
Prof. Angelo De Jesus
Nature of Reactants
1. Copper(Cu) 2. Iron (Fe) 3.Zinc (Zn) 4. Aluminum (Al) 5.Magnesium(Mg)
RANK METAL OBSERVATIONS CHEMICAL
EQUATIONS
5 Cu Cupper doesn’t
react with 6 M
HCL
Cu + HCL
4 Fe From colorless, it
changes into
yellow green . It
also bubbled little.
Fe + HCL
3 Zn It bubbled
instantly but
doesn’t change its
color
Zn + HCL
2 Al Its color turns into
gray.
Al + HCL
1 Mg It Effervescence
But it stopped
immediately.
Mg + HCL
SURFACE AREA/
PARTICLE SIZE
Dropping simultaneously on two test tubes
containing 3 ml of 6 M HCL Of Zinc powder and Zinc
mossy.
Zinc powder reacts faster than zinc mossy
because Zinc powder has greater surface area
than Zinc mossy.
Zinc powder has more fine division, so the
reaction is fast while Zinc mossy reacts slowly
because it is solid and the particles are not
exposed, so it is having a hard time to reacts
with HCL.
CONCENTRATION
A. Reaction of HCL with MagnesiumThe first to reacts with Magnesium is the 6 M HCL. Second, 4 M
HCL. And lastly is the 2M HCL. The reaction rates depends on the
concentration of the acid because the higher concentration, the
more collisions between the reactant particles.
B. Iodide-clock
reactionIt is combination of 1 ml
KIO3 solution, 8 ml
distilled water and 1 ml
starch- sulfite solution. As
I put the starch- sulfite
solution, it takes 14
seconds to appear the
blue color. It is a very light
blue.
SAMPLE Ml Starch-
sulfite
Ml KIO3 Ml H2O TIME(sec)
Standard run 1 1 8 14
1 1 2 7 17
2 1 3 6 18
3 1 4 5 13.5
4 4 1 5 3
5 3 1 6 8
6 2 1 7 12.5
Effect of concentration on the rate of reaction
Reaction at 30oC
Temperature
Reaction at 50oC
Using hot water temperature.
Potassium permanganate with
sulfuric acid and oxalic acid
Using the room
temperature.Using cold water temperature
The higher the temperature is, the faster the
reaction rates. On hot water, it changes
immediately in color because it increases the
number of collision as well as the energy of the
collision. While on the experiment which used the
room temperature, it takes about 15 minutes to
decolorized. Lastly, on cold water, the energy of
collision is low, so it also reacts slowly with the
solution.
CATALYST
The reaction on Zn
and H2SO4 with
CuSO4 is it
immediately react .
While without CuSO4,
it has slower time to
react with the solution.
STARCH HYDROLYSIS
Without amylase With amylase
Without amylase, the solution tends to
remain on its color. However, with
amylase, it becomes colorless. It is
because with amylase, it increases the
rate of reaction while without amylase
isn’t.
The End Thank you.