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.