AP EAPCET (Engineering) Chemical Kinetics — practice questions
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Practice AP EAPCET (Engineering) Chemical Kinetics in the app →The SI/CGS-style units of the **rate of a chemical reaction** are:For the reaction A → B, the rate of reaction can be written as:The **rate constant** $k$ in a rate law equals the rate of reaction when:The order of a reaction:For a zero-order reaction, the units of the rate constant $k$ are:For a first-order reaction, the units of the rate constant $k$ are:For the same reaction ($2N_2O_5 \to 4NO_2 + O_2$, $d[N_2O_5]/dt = -0.02$), the **rate of formation of $NO_2$**If rate = $k[A][B]^2$, what are the units of $k$?For the reaction A + B → P with $\text{rate} = k[A][B]^2$, rate = $3.6 \times 10^{-2}$ mol dm⁻³ s⁻¹ when [A] =For the reaction R → P, the *instantaneous* rate of reaction is given by:For the reaction 2HI(g) → H₂(g) + I₂(g), the rate of reaction is:The SI unit of rate of a reaction is:The rate law for a reaction must be:The units of the rate constant k for a zero-order reaction are:The units of the rate constant k for a first-order reaction are:A rate constant has units of L mol⁻¹ s⁻¹. The order of the reaction is:For a zero-order reaction R → P, the integrated rate equation is:For a first-order reaction, the half-life t_(1/2) is:All radioactive decays follow which order of kinetics?A first-order reaction with rate constant k = 5.5 × 10⁻¹⁴ s⁻¹ has a half-life of approximately:For a chemical reaction, with a rise in temperature by 10°C, the rate of reaction typically:The Arrhenius equation is:On a plot of ln k versus 1/T (Arrhenius plot), what is the slope?In the Arrhenius equation, the pre-exponential factor A is also called:For a first-order reaction, the time required for 99.9% completion is approximately:For a first-order reaction, if the initial concentration of N₂O₅ is 1.24 × 10⁻² mol L⁻¹ and after 60 min it isFor a zero-order reaction, if the initial concentration is doubled, the half-life:Time required to decompose SO₂Cl₂ to half of its initial amount is 60 min. Assuming first-order kinetics, the Rate of reaction is defined as:Rate law: r = k [A]ᵐ [B]ⁿ. Sum m + n is called:For a first-order reaction, rate ∝:Units of rate constant k for a first-order reaction:Arrhenius equation: k = A × e^(-Ea/RT). What is A?For first-order reaction, half-life t₁/₂:For zero-order reaction A → P, rate equals:For first-order, integrated rate law:For second-order reaction (single reactant), integrated rate law:Catalyst affects:Order of reaction CAN be determined from:A first-order reaction is 25% complete in 20 min. Time for 75% completion:For a reaction with Ea = 100 kJ/mol, find k₂/k₁ when T goes from 300 K to 350 K. (R = 8.314 J/mol K):For a 2nd-order reaction with [A]₀ = 0.5 M and k = 0.1 L mol⁻¹ s⁻¹, half-life:For complex reaction with rate-determining step that involves 2 molecules of A, the order in A is:For Arrhenius plot of ln k vs 1/T, slope equals:Threshold energy = Ea + average kinetic energy of reactants. If Ea = 50 kJ/mol and avg KE = 4 kJ/mol, thresholFor reaction A → B with rate constant 10⁻³ s⁻¹ (first order), concentration after 1000 s if [A]₀ = 1 M:A reaction has k = 0.05 s⁻¹. After how many seconds is 90% complete?For radioactive decay (1st order), if 1/8 of initial nuclei remain, how many half-lives elapsed?A catalyst lowers Ea from 100 kJ/mol to 75 kJ/mol at T = 300 K. Rate enhancement factor (R = 8.314 J/mol K):For elementary bimolecular reaction 2 NO → products, rate law is:What is the overall order of a reaction with rate = k[A]^(3/2)[B]^(-1)?A reaction is second order in X. If [X] is tripled, the rate becomes how many times larger?For a first order reaction, 99.9% completion takes about how many half-lives?If the rate constant roughly doubles per 10 degree rise, a 30 degree rise raises it about how much?A first order reaction has t1/2 = 20 min. How long does 75% completion take?A zero order reaction starts at 0.8 mol/L with k = 0.02 mol L^-1 s^-1. When is the reactant used up?For 2NO + O2 giving 2NO2, rate = k[NO]^2[O2]. Doubling [NO] alone changes the rate how?Zero order half-life varies with initial concentration how?For a first order reaction, ln[R] plotted against time gives a line with what slope?Decomposition of ammonia on hot platinum at high pressure follows which order?Thermal decomposition of HI on a gold surface is a reaction of which order?Radioactive decay of unstable nuclei follows which kinetics?Hydrolysis of ethyl acetate in a large excess of water behaves as which type of reaction?Inversion of cane sugar in water is commonly classed as what?Which value can the molecularity of a reaction never take?Molecularity has meaning only for which kind of reaction?Decomposition of ammonium nitrite into N2 and water is what molecularity?The elementary step 2HI giving H2 + I2 has what molecularity?Why are reactions of molecularity three rare and slow?Which step controls the overall rate of a multi-step reaction?In the iodide-catalysed decomposition of H2O2, which species is the intermediate?A plot of ln k against 1/T is a straight line with what slope?A substance added to a reaction that reduces its rate is called what?Which theory explains catalysis by a temporary catalyst-reactant bond?Collision theory of reaction rates was developed by whom?In collision theory, the steric factor P accounts for what?Threshold energy of a reaction equals which sum?Diamond should turn into graphite. Why is no change seen?For gaseous reactions with partial pressures, the rate has which units?How is instantaneous rate read from a concentration curve?On heating, how does the Maxwell-Boltzmann energy curve change?The equation first proposed by J.H. van't Hoff for temperature dependence was justified by whom?How must the rate law of a reaction be established?Mixing silver nitrate and sodium chloride solutions gives AgCl how fast?For a complex reaction, the overall order is decided by which step?A rate doubles from 298 K to 308 K. Its activation energy is aboutAs a reaction proceeds and reactants are used up, its rate usually does what?Raising temperature or lowering Ea affects the rate constant how?Which branch of chemistry tells how fast a reaction proceeds rather than only whether it is feasible?The expression relating reaction rate to reactant concentrations raised to powers is called theIn a rate law, the exponents of the concentration terms areFor 2NO + O2 giving 2NO2, the rate is k[NO]^2[O2]. What is the overall order?Which statement about the order of a reaction is correct?A zero order reaction is one whose rateA rate constant of 3 x 10^-4 s^-1 indicates which order?Reactions that occur in a single step are calledA first order reaction has t1/2 of 6 min. Time for 99.9 percent completion is nearlyCollision theory was developed in 1916 to 1918 byWho studied the inversion of sucrose in 1850, pioneering chemical kinetics?Who received the first Nobel Prize in Chemistry in 1901 for laws of chemical dynamics?