Recent questions tagged chemical-kinetics

For chemical reaction shown below.Which of following statements can be rightly assumed?

asked Dec 18, 2013 by sreemathi.v

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Consider proposed mechanism for reaction between nitrogen monoxide and hydrogen gas.Step (i):$2NO\rightarrow N_2O_2$,Step 2:$N_2O_2+H_2\rightarrow N_2O+H_2O$,Step 3:$N_2O+H_2\rightarrow N_2+H_2O$.If step 2 rate determining step,then rate law for reaction and all the intermediate of reaction will be

asked Dec 18, 2013 by sreemathi.v

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The half life of carbon is 5730years.Approximately how many years will it take for 94% of a sample to decay?

asked Dec 18, 2013 by sreemathi.v

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Which of these changes with time for $1^{st}$ order reaction $(i)\;\text{rate of reaction}\\(ii)\;\text{rate constant}\\(iii)\;\text{half life}\\(iv)\;\text{concentration of reactant}$

asked Dec 18, 2013 by sreemathi.v

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Rate of reaction increases by factor of 10 when temperature increased from $300K$ to 400K.Then find activation energy of reaction

asked Dec 18, 2013 by sreemathi.v

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The decomposition of hydrogen bromide into hydrogen and iodine is second order reaction.The reaction rate constant is $K=0.08Lmol^{-1}s^{-1}$.How long it take an initial concentration of 0.04M to decrease to half this concentration?

asked Dec 18, 2013 by sreemathi.v

1 answer

At $150^oC$ the decomposition of acetaldehyde to methane is first order reaction. If rate constant for reaction at $750^oC$ is $0.05m^{-1}$, how long does it take a concentration of $0.04\;mol\;L^{-1}$ of acetaldehyde to reduce concentration of $0.03\;mol\;L^{-1}$?

asked Dec 18, 2013 by sreemathi.v

1 answer

What is the rate constant for a reaction of $(CH_3)_3CBr$ with water is represented below :$CH_3)_3CBr+H_2O\rightarrow (CH_3)_3COH+HBr$ where the following data was obtained experimentally:

asked Dec 18, 2013 by sreemathi.v

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If a reactant is used up according to a first order rate equation and initial concentration of reactant is $32mol\;L^{-1}$ what is concentration of reactant after six half lives have passed?

asked Dec 18, 2013 by sreemathi.v

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Consider the following reaction:- Step (i): $H_2O_2+I^-\rightarrow H_2O+IO^-$, Step (ii): $H_2O_2+IO^-\rightarrow H_2O+O_2+I^-$, then reaction intermediate will be

asked Dec 18, 2013 by sreemathi.v

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Addition of catalyst to reaction increases the rate because it

asked Dec 18, 2013 by sreemathi.v

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Which one of following changes would result in greatest increase in reaction rate in the following two-step mechanism?

asked Dec 18, 2013 by sreemathi.v

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Consider following reactions :(i) $H_2(g)+I_2(g)\rightarrow 2HI(g),(ii)\;2Mg(s)+O_2(g)\rightarrow 2MgO(s),(iii)\;CaCO_3(s)+2H^+(aq)\rightarrow Ca^{+2}(aq)+H_2O(l)+CO_2(g)$.When we increase surface area will increase reaction rate in

asked Dec 18, 2013 by sreemathi.v

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For following potential energy diagram : True statement is :-

asked Dec 18, 2013 by sreemathi.v

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The rates in order of fastest to slowest for this reaction: a 5g of powdered $Mg(s)+2HCl(aq)\rightarrow MgCl_2(aq)+H_2(g)$ are:

asked Dec 18, 2013 by sreemathi.v

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Consider the following reaction: $\large\frac{1}{2}$$H_2(g)+\large\frac{1}{2}$$Cl_2(g)\rightarrow HCl(g)$ $\Delta H=20KJ$.The activation energy for formation of HCl is 150KJ.Then activation energy for decomposition of HCl will be

asked Dec 18, 2013 by sreemathi.v

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Consider following potential energy graph

asked Dec 17, 2013 by sreemathi.v

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The variation of PE & KE as reactant molecules approach each other can be represented by

asked Dec 17, 2013 by sreemathi.v

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Which of following corresponds to faster reaction at room temperature? (y-axis is Potential Energy and x-axis is Progress of reaction).

asked Dec 17, 2013 by sreemathi.v

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An activated complex has

asked Dec 17, 2013 by sreemathi.v

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An increase in temperature increases the rate of a chemical reaction because

asked Dec 17, 2013 by sreemathi.v

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If for same temperature we consider the following two reactions, then Collision I is successful and II is not because of what?

asked Dec 17, 2013 by sreemathi.v

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Choose the correct option below based on the following statement:

asked Dec 17, 2013 by sreemathi.v

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Which of following are necessary for successful collisions to occur? (i) Favourable collision geometry (ii) sufficient kinetic energy (iii) Large $\Delta H$

asked Dec 17, 2013 by sreemathi.v

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The photochemical reactions are those which

asked Dec 17, 2013 by sreemathi.v

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Consider the following reaction :$NaOH(aq)+HCl(aq)\rightarrow H_2O(l)+NaCl(aq)$.The rate of reaction can be found by observing change in concentration

asked Dec 17, 2013 by sreemathi.v

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Consider the statement: Solid Mg added to 2M HCl. In the first 10 seconds,the temperature of container increased by $1^0C$ and 20ml of $H_2$ was produced. Determine rate of reaction.

asked Dec 17, 2013 by sreemathi.v

1 answer

In the following reaction and graph:$2H_2O_2(l)\rightarrow 2H_2O_2+O_2(g)$, he average rate of reaction is greatest in which time period?

asked Dec 17, 2013 by sreemathi.v

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Consider the following reaction; $2H_2O_2(l)\rightarrow 2H_2O(l)+O_2(g)$ which graph shows the relation between rate of consumption of $H_2O_2$ and time?

asked Dec 17, 2013 by sreemathi.v

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The rate of chemical equation is equal to slope of graph with ones labelled

asked Dec 17, 2013 by sreemathi.v

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Ammonia can be oxidized by oxygen to produce $NO_2$ according to reaction $4NH_3+7O_2\rightarrow 4NO_2+6H_2O$.If water is formed of $36\;mol\;L^{-1}min^{-1}$.Then respective rates of $NH_3,O_2$ used will be(in M/min)

asked Dec 17, 2013 by sreemathi.v

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For the reaction $A\;\;\;\underrightarrow{k_1}\;\;\;B\;\;\;\underrightarrow{k_2}\;\;\;C$, select the correct statement:

asked Dec 17, 2013 by sreemathi.v

1 answer