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Chemical Sciences Colloid and Surface Chemistry Virtual Lab Experiments

Aim

Theory

Objective

Pretest

Procedure

Simulation

Posttest

Assignment

References

Feedback

Aim

Theory

Objective

Pretest

Procedure

Simulation

Posttest

Assignment

References

Feedback

Study of the Catalytic Effects of Finely Divided Particles

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1. In heterogeneous catalysis of a gaseous reactants over solid catalyst:

a: Reaction occurs on the surface of the catalyst. Explanation

Explanation

b: reaction occurs when the gases diffuse towards the surface of the catalyst. Explanation

Explanation

c: reaction occurs when the gases are about to desorb from the catalyst surface. Explanation

Explanation

d: reaction occurs after the desorption of reactants. Explanation

Explanation

2. When body temperature is high, doctors advice consumption of light food. This is because:

a: At high temperature the body is weak Explanation

Explanation

b: Body temperature can increase further. Explanation

Explanation

c: At high temperature certain enzymes get denatured and cannot function well. Explanation

Explanation

d: At high temperature co-enzymes are not available. Explanation

Explanation

3. Can one follow the reduction of eosin by borohydride by measuring the absorbance of gold particles and why?

a: yes, as the gold particles get used up in the reaction. Explanation

Explanation

b: no, as the gold particles are used up in the reaction. Explanation

Explanation

c: no, as the gold particles are catalysts and are regenerated back at the end of the reaction. Explanation

Explanation

d: yes, as the gold particles become colorless. Explanation

Explanation

4. Why does the absorbance vs time plot become flat after some time:

a: No more gold particles are available for reaction. Explanation

Explanation

b: the reduction reaction is complete. Explanation

Explanation

c: sodium borohydride is left in excess. Explanation

Explanation

d: gold particles absorb all incoming light. Explanation

Explanation

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