Recent questions in Chemistry

Which of the following is not true about ideal gas molecules?

asked Sep 25, 2018 by meena.p

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What is the shape of a P-T curve for ideal gas?

asked Sep 25, 2018 by meena.p

1 answer

Which of the following term does not involve in ideal gas law?

asked Sep 25, 2018 by meena.p

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A balloon of volume .666L at 1.03atm is placed in a pressure chamber where the pressure becomes 5.68atm, determine the new volume.

asked Sep 25, 2018 by meena.p

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What will be the final pressure if the volume of the container changes to 2L?

asked Sep 25, 2018 by meena.p

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The graph depicted below represents which of the gas laws?

asked Sep 24, 2018 by meena.p

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Assume air contains 21% oxygen and 79% nitrogen. If air is compressed to 5.5atm, what is the partial pressure of the oxygen?

asked Sep 24, 2018 by meena.p

1 answer

As the temperature is raised from $20^{\circ}$ to $40^{\circ}C$ , the average kinetic energy of neon atoms charges by a factor of which of the following ?

asked Sep 24, 2018 by meena.p

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Which is not true in case of an ideal gas ?

asked Sep 24, 2018 by meena.p

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When 200 milliliters of a gas at constant pressure is heated, its volume

asked Sep 24, 2018 by meena.p

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Which law is the following formula? $V_1T_1=V_2T_2$

asked Sep 24, 2018 by meena.p

1 answer

Assume air contains 21% oxygen and 79% nitrogen. If air is compressed to 5.5atm, what is the partial pressure of the oxygen?

asked Sep 24, 2018 by meena.p

1 answer

Which of the following gas laws can be used to determine the total pressure of a mixture of gases?

asked Sep 24, 2018 by meena.p

1 answer

Which of the following is a physical property of gases?

asked Sep 24, 2018 by meena.p

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A container filled with fluorine gas and neon gas and has a total pressure of 8atm. There are 50g of fluorine gas in the container, and the fluorine gas exerts a pressure of 5atm.Based on this, what is the mass of neon in the container?

asked Sep 24, 2018 by meena.p

1 answer

Which of the following is not a characteristic of gases?

asked Sep 24, 2018 by meena.p

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Which of the following gases will diffuse the quickest through a small hole?

asked Sep 24, 2018 by meena.p

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Calculate enthalpy change when $2.38\;g$ of carbon monoxide vapourises at its normal boiling point. $\Delta H_{vap}$ of $CO=6.04\;kj\;mol^{-1}$

asked Sep 17, 2018 by meena.p

1 answer

Most metals react with acids to form

asked Sep 17, 2018 by meena.p

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A system does 200 J of work and at the same time absorbs 150 J of heat. What is the internal energy change ?

asked Sep 17, 2018 by meena.p

1 answer

The equilibrium constant for the reaction is 10. Calculate the value of $\Delta G^{-}$ given

asked Sep 17, 2018 by meena.p

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Enthalpy of combustion of carbon to carbon dioxide is $-393.5\;kJ\;mol^{-1}$. calculate the heat released upon formation of $35.2\;g$ of $CO_2$ from carbon to oxygen gas.

asked Sep 17, 2018 by meena.p

1 answer

A reaction ,$A+B \to C+D+q$ is found to have an positive entropy change. The reaction will be

asked Sep 17, 2018 by meena.p

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The enthalpies of all elements in their standard states are :

asked Sep 17, 2018 by meena.p

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In a process , 701 J of heat is absorbed by a system and $394\;J$ of work is done by the system . What is the change in internal energy for the process ?

asked Sep 17, 2018 by meena.p

1 answer

How much heat is required to raise the temperature of an aluminium vessel weighting 1.25 kg from $25^{\circ}C$ to $55^{\circ}$ ? Molar heat capacity of Al is $24\;J\;mol^{-1}K^{-1}$

asked Sep 14, 2018 by meena.p

1 answer

When water is added to conc. $H_2SO_4$ it gets very hot. This happens because dilution of conc. $H_SO_4$ is ........

asked Sep 7, 2018 by meena.p

0 answers

The bond dissociation enthalpy of gaseous $H_2, Cl_2$ and $HCl$ are $435, 243$ and $431\; kJ mol^{-1},$ respectively. Calculate the enthalpy of formation of HCl gas.

asked Sep 7, 2018 by meena.p

1 answer

The enthalpies of combustion of carbon and carbon monoxide are $-393.5$ and $-283\;kJ\;mol^{-1}$ respectively . The enthalpy of formation of carbon monoxide per mole is

asked Sep 7, 2018 by meena.p

1 answer

The enthalpy change for a reaction does not depend upon

asked Sep 7, 2018 by meena.p

1 answer

For the reactions, $C+O_2 \to CO_2 ; \Delta H= -393\;J,2Zn +O_2 \to 2ZnO$; $\Delta H= -412\;J$

asked Sep 7, 2018 by meena.p

1 answer

If enthalpies of methane and ethane are respectively 320 and 360 calories then the bond energy of C−C bond is

asked Sep 4, 2018 by meena.p

1 answer

Energy required to dissociate 4 gm of gaseous hydrogen into free gaseous atoms is 208 kcal at $25^{\circ}C$.The bond energy of H−H bond will be

asked Sep 4, 2018 by meena.p

1 answer

The enthalpy of an ideal gas depends only on the temperature.

asked Sep 4, 2018 by meena.p

1 answer

Heat transferred at constant pressure _____ the enthalpy of a system.

asked Sep 4, 2018 by meena.p

1 answer

Which reaction will result in a negative entropy?

asked Sep 4, 2018 by meena.p

1 answer

Change in enthalpy of a system is due to heat supplied at

asked Aug 26, 2018 by meena.p

1 answer

For an ideal gas, enthalpy becomes

asked Aug 26, 2018 by meena.p

1 answer

In a constant volume process, internal energy change is equal to

asked Aug 26, 2018 by meena.p

1 answer

Entropy is a

asked Aug 26, 2018 by meena.p

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A reaction will reach equilibrium when the system's entropy __________.

asked Aug 26, 2018 by meena.p

1 answer

$N_2(g) \qquad \Delta S_f=191.5\;J \\ O_2(g) \qquad \Delta S_f=205\;J \\ NO\qquad \Delta S_f=210.7\;J $ <br> What is the change in entropy for the following reaction? $N_{2(g)}+O_{2(g)}→2NO$

asked Aug 26, 2018 by meena.p

1 answer

Which of the following reactions represents a negative change in entropy?

asked Aug 26, 2018 by meena.p

1 answer

Which of the following does not represent an increase in entropy?

asked Aug 26, 2018 by meena.p

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The entropy of an isolated system always and becomes a at the state of equilibrium.

asked Aug 26, 2018 by meena.p

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Which of the following is true?

asked Aug 26, 2018 by meena.p

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The reaction $2KClO_{3(s)} \longrightarrow 2KCl_(s)+3O_{2(g)}$ is a(n)

asked Aug 23, 2018 by meena.p

1 answer

What happens when carbon dioxide is passed in lime water?

asked Aug 23, 2018 by meena.p

1 answer

Calculate the acid dissocation constant $K_a$ at $298\;K$ for a $0.010\;mol\;dm^{-3}$ solution of propanoic acid, $CH_3CH_2COOH$ The pH of this solution is $3.43$

asked Aug 23, 2018 by meena.p

1 answer

The correctly balanced equation for $FeS_2 +O_2 \to Fe_2O_3 +SO_2$ is ________

asked Aug 23, 2018 by meena.p

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