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Catalyst

Q. A chemist has some propene, H2C= CHCH3, in a compressed gas tank to convert to propane, H3CCH2CH3. The first thought is to combine the gas from the propene tank with that from a tank of a compressed hydrogen gas, H2. However, when this is tried nothing happens. The chemist finds some powdered palladium mixed in with inert charcoal in the chemical supply cabinet. Under conditions controlled for temperature and pressure, the chemist places the palladium into the flowpath from the hydrogen and propene tanks. As the mixuture of propene and hydrogen flows past the palladium, a reaction occurs so that when the gas reaches the temperature controlled receiving tanks, it is propane gas. After all the propene has been converted to propane, the curious chemist pours the palladium-charcoal mixture into a crucible. After analyzing the palladium, the chemist confirms that the chemical state has not changed. What did the palladium do to increase the rate of the reaction between the propene and hydrogen? a) It changed the thermodynamic equilibrium. b) It made the Gibbs free energy of the reaction more positive. c) It lowered the activation energy of the reaction. d) It increased the activation energy of the reaction.

Solved • Mar 1, 2020

Catalyst

Q. A chemist has some propene, H2C= CHCH3, in a compressed gas tank to convert to propane, H3CCH2CH3. The first thought is to combine the gas from the propene tank with that from a tank of a compressed hydrogen gas, H2. However, when this is tried nothing happens. The chemist finds some powdered palladium mixed in with inert charcoal in the chemical supply cabinet. Under conditions controlled for temperature and pressure, the chemist places the palladium into the flowpath from the hydrogen and propene tanks. As the mixuture of propene and hydrogen flows past the palladium, a reaction occurs so that when the gas reaches the temperature controlled receiving tanks, it is propane gas. After all the propene has been converted to propane, the curious chemist pours the palladium-charcoal mixture into a crucible. After analyzing the palladium, the chemist confirms that the chemical state has not changed. What word best describes the role that the palladium plays in the reaction between propene and hydrogen? a) It is a catalyst. b) It is an activation energy barrier. c) It is a solvent. d) It is a reagent.

Solved • Mar 1, 2020

Catalyst

Q. Describe two ways by which a catalyst can reduce the activation energy of a reaction.

Solved • Mar 11, 2020

Catalyst

Q. Platinum is used to catalyze the hydrogenation of ethylene: H2(g) + CH2CH2(g) → CH3CH3(g) Chlorofluorocarbons (CFCs) catalyze the conversion of ozone (O3) to oxygen gas (O2): 2O3(g) → 3O2(g) 2H2O2(aq) → 2H2O(l) + O2(g) What type of catalyst are platinum, CFCs, and magnesium under these conditions? Drag the appropriate items to their respective bins

Solved • Feb 11, 2020

Catalyst

Q. The graphs shown here are called potential energy diagrams. They show the potential energy of a system as it changes from reactants to products. The first graph shows the uncatalyzed reaction (figure 1); the second graph shows the catalyzed reaction (Figure 2). How does the presence of a catalyst affect the activation energy of a reaction?

Solved • Feb 11, 2020

Catalyst

Q. Platinum is used to catalyze the hydrogenation of ethylene: H2(g) + CH2CH2(g) → CH3CH3(g) Chlorofluorocarbon (CFCs) catalyze the conversion of ozone (O3) to oxygen gas (O2): 2O3(g) → 3O2(g) Magnesium catalyzes the disproportion of hydrogen peroxide to produce water and oxygen: 2H2O2(aq) →2H2O(l) + O2(g) What type of catalysts are platinum, CFCs, and magnesium under these conditions? Drag the appropriate items to their respective bins.

Solved • Feb 6, 2020

Catalyst

Q. The graphs shown here are called potential energy diagrams. they show potential energy of a system as it changes from reactants to products. The first graph shows the uncatalyzed reaction (Figure 1); the second graph shows the catalyzed reaction ( Figure 2.). How does the presence of a catalyst affect the activation energy of a reaction?

Solved • Feb 6, 2020