Chemical kinetics Questions and Answers

The rate constant for this second-order reaction is 0.820 M-¹. s-¹ at 300 °C. A --> products How long, in seconds, would it take for the concentration of A to decrease from 0.950 M to 0.220 M?

A certain reaction has an activation energy of 35.30 kJ/mol. At what Kelvin temperature will the reaction proceed 3.00 times faster than it did at 343 K?

The rate constant for this zero-order reaction is 0.0400 M s¹ at 300 °C. A --> products How long (in seconds) would it take for the concentration of A to decrease from 0.890 M to 0.220 M?

After 44.0 min, 41.0% of a compound has decomposed. What is the half-life of this reaction assuming first-order kinetics?

Describe and explain the possible effect on your results (yield and purity) of the following experimental errors or variations: a. The reaction flask you used for the preparation of m-toluoyl chloride was wet b. Instead of 3.0 M NaOH, you used the same amount of 1.0 M NaOH for the reaction step c. You didn't stir the reaction mixture during the reaction of diethylamine with acid chloride

The Lewis structure for carbon monoxide is:C=O:This structures shows A) 4 lone pairs and 1 bonding pair. B) 4 lone pairs and 3 bonding pairs. C) 2 lone pairs and 3 bonding pairs. D) 2 lone pairs and 1 bonding pair. E) none of the above

The activation energy for a particular reaction is 102 kJ/mol. If the rate constant is 1.35 x 10s¹ at 308 K, what is the rate constant at 273 K?

For the decomposition of nitrous oxide at 565 °C 2 N₂0 2 N₂ + 0₂ the average rate of disappearance of N₂O over the time period from t = 0 s to t= 522 s is found to be 1.54x10-³ M s¹_ The average rate of formation of O₂ over the same time period is Ms-1.

Use the information to answer the following question. Several groups of Chemistry students are tasked with producing aluminum chloride using solid aluminum as a reactant. The teacher provides the students with two forms of aluminum, powder and solid chunks. Which type of aluminum should the students plan to use in order to increase the reaction rate? Solid chunks because the greater surface area will allow more collisions between reactants to occur. Powder because the lower surface area will allow more collisions between reactants to occur. Solid chunks because the lower surface area will allow more collisions between reactants to occur. Powder because the greater surface area will allow more collisions between reactants to occur.

Dichlorodifluoromethane (CF₂Cl2) is a CFC (chlorofluorocarbon) molecule that used tobe used as a refrigerant, though people discovered that CFCs harm Earth's ozone (O3)layer, which protects us from the sun's harmful UV rays. Another type of harmful CFC is CHF₂CI, called chlorodifluoromethane. The boiling point of CHF₂Cl is about -41°C, and the boiling point of CF2Cl2 is -30°C. CHF₂CI has a [Select] boiling point than CF₂Cl₂ CHF₂CI has a [Select] vapor pressure than CF₂Cl₂ thus, we can conclude that CHF₂Cl has [Select] IMF than CF₂Cl2

Two volatile substances, A and B are dissolved in one another and the resulting solution has a vapor pressure of 137 torr. If the mole fraction of B is 0.230 and the vapor pressure of pure B is 162 torr, what is the vapor pressure of pure A in torr?

The rate at which a certain drug is eliminated by the body follows first-order kinetics, with a half life of 85 minutes. Suppose in a particular patient the concentration of this drug in the bloodstream immediately after injection is 0.60 ug/mL. What will the concentration be 425 minutes later? Round your answer to 2 significant digits.

NaHCO3(s)+HC2H3O2(aq) → NaC2H3O2(aq) +H2O(l) +CO2(g) A student designs an experiment to study the reaction between NaHCO, and HC₂H₂O₂. The reaction is represented by the equation above. The student places 1.26 g of NaHCO, in a flask and adds 60.0 mL of 0.875 M HC,H,O,. The student observes the formation of bubbles and that the flask gets cooler as the reaction proceeds. a. Identify the reaction represented above as an acid-base reaction, precipitation reaction, or redox reaction. Justify your answer. b. Based on the information above, identify the limiting reactant. Justify your answer with calculations.

Chymotrypsin is a protease that hydrolyzes proteins. It is active in the small intestine at an optimum pH of 8.0. How is the rate of a chymotrypsin-catalyzed reaction affected by using more enzyme in the reaction mixture? The rate would increase. The rate would first increase and then it would decrease. The rate would be unchanged. The rate would decrease. I DON'T KNOW YET

Gaseous Radon-222 forms in soil. As it rises from the soil, it can be trapped in basements below homes. This gas, an alpha emitter, decays into Po-218, once inhaled by people it can cause lung cancer. A sample of gas is tested for Rn-222. The 1/2 life of Rn-222 is 3.823 days. After 63 days the sample is found to contain 3.50×10-8 g of Rn-222. How many grams of Rn-222 were initially present? _________g How many grams of Po-218 have been formed? _________g

Two different reactions begin with equal concentrations of their respective reactants, A and C. Both reactions proceed, but reaction 1 has a faster initial rate than reaction 2. Both reactions are allowed to react for an extended period of time. Reaction 1: A⇒ B faster initial rate Reaction 2: C ⇒ D slower initial rate Identify the conclusion that cannot be made based on the information given. Reaction 2 has a smaller concentration of products at equilibrium. Reaction 1 and reaction 2 can both reach equilibrium. The concentrations of C and D do not change at equilibrium. Reaction 1 reaches equilibrium more quickly than reaction 2.