Recent questions tagged general-characteristics

For the reaction $A+B \rightarrow C+D$, calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 25, 2014 by balaji.thirumalai

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The activation energy for a certain reaction is 76.7 kJ mol$^{-1}$. How many times faster will the reaction occur at 50$^\circ$C compared to 0$^\circ$C?

asked Jul 25, 2014 by balaji.thirumalai

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Calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant of a reaction at 32$^\circ$C is 0.055 s$^{-1}$. If the frequency or pre-exponential factor is 1.2 $\times$ 10$^{13}$ s$^{-1}$, what is the activation energy?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

If a temperature increase from 20$^\circ$C to 35$^\circ$C triples the rate constant for a reaction, what is the value of the activation barrier for the reaction?

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant (k) for a reaction was determined as a function of temperature. A plot of $ln\; k$ versus $ \large\frac{1}{T}$ (in $K$) is linear and has a slope of $-1.01 \times 10^{4}\;K$. Calculate the activation energy for the reaction.

asked Jul 25, 2014 by balaji.thirumalai

1 answer

The rate constant for the 2nd order reaction shown below is $0.54 M^{–1}$ at 300$^{\circ}$ C. How many seconds would it take for the concentration of NO$_s$ to decrease from $0.62\; M$ to $0.28\; M$?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The thermal decomposition of phosphine to phosphorus and hydrogen gas is a first order reaction, with a half-life of 35 s at 680$^\circ$C. Calculate the time required for 95% of phosphine to decompose.

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The thermal decomposition of N$_2$O$_5$ to form NO$_2$ and O$_2$ is a first order reaction. The rate constant for the reaction is $5.1x10^{–4}s^{-1}$ at $318^{\circ} K$. Calculate the half-life of this reaction.

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The following data was collected in three different experiments:

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Calculate the value of k for this reaction based on the following data collected in three different experiments:

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Consider the following reaction:$ A + 3 B \rightarrow 2 C + 2 D$. In one experiment, the rate of change of B was found to be $2.50 \times 10^{–4}\;M/s$. What is the rate of change of C in this experiment?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

A certain first order reaction proceeds through t first order kinetics. The half-life of the reaction is 180 s. What percent of the initial concentration remains after 900s?

asked Jul 24, 2014 by balaji.thirumalai

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The decomposition of $N_2O_5$ is given by the following equation: $2\; N_2O_5\; (g) \rightarrow 4 NO_2\;(g) + O_2\;(g)$ At an initial $[N_2O_5]_0 = 3.15\; M$, the initial rate of reaction is $5.45 \times 10^{-5} \;M/s$ and when $[N_2O_5]_0 = 0.78\; M$, the initial rate of reaction is $1.35 \times 10^{-5}\; M/s$. What is the rate constant of this reaction?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

The reaction $A \rightarrow \text{Products}$ is second order in $A$. Initially $[A]_0 = 1.00 M$ and after $25 \; \text{mins}, \;[A] = 0.25\; M$. What is the rate constant for this reaction?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

From the integrated rate law for a first order reaction, $ [A] = [A]_0\; e^{-kt}$. Suppose rate constant, $k = 2.95 X 10^{-3} s^{-1}$, What percent of $A$ remains after $150 \;s$?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

An elementary reaction, $2 A + C \rightarrow D$ , is second order in $A$ and first order in $C$. The rate of this reaction is $2.5 \times 10 ^{-1}1\; M/s$ when the concentrations of $A$ and $C$ are all $3.00\; mM$. What is the rate constant for the reaction?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

A first order reaction has a rate constant of $1.00\;s^{-1}$. What is the half life of the reaction?

asked Jul 24, 2014 by balaji.thirumalai

1 answer

Consider following reaction: $Mg(s)+2HCl(aq)\rightarrow H_2(g)+MgCl_2(aq)$.The rate of this reaction increases when more magnesium is added.This change is due to

asked Dec 19, 2013 by sreemathi.v

1 answer

For reaction $X+Y\rightarrow Z$ the reaction rate is found to depend only upon concentration of X. A plot of $\large\frac{1}{[X]}$ vs time gives a straight line. What is rate law for this reaction?

asked Dec 19, 2013 by sreemathi.v

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Which of following is incorrect?

asked Dec 19, 2013 by sreemathi.v

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Which of following statements is incorrect for a first order reaction, where $T_x$ is the time taken for the reactant to drop by that % number.

asked Dec 19, 2013 by sreemathi.v

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What is the relation between half life ($t_{1/2}$) and temperature for an $n^{th}$ order reaction ;$n > 2$

asked Dec 19, 2013 by sreemathi.v

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From following data of decomposition of ammonium nitrate in aqueous solution, Determine the order of reaction:

asked Dec 19, 2013 by sreemathi.v

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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

1 answer

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

1 answer

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

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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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

1 answer

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

1 answer

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

1 answer