The Ellingham diagram predicts the feasibility of reduction of metal oxides by:
Comparing the relative positions of the lines for the metal oxide and the reducing agent.
Calculating the exact value of the equilibrium constant for the reaction.
Determining the activation energy for the reduction reaction.
Measuring the enthalpy change of the reaction.
Related Questions
In an Ellingham diagram, a line with a more negative slope than another indicates:
A larger increase in entropy during the reaction.
A smaller increase in entropy during the reaction.
A more negative enthalpy change for the reaction.
A less negative enthalpy change for the reaction.
Based on the Ellingham diagram, which metal is the most suitable reducing agent for alumina () at a temperature of 1000°C?
Zn
Fe
Mg
Cu
Using the Ellingham diagram, predict the approximate temperature above which magnesium can reduce alumina ().
1000°C
1600°C
2000°C
2500°C
In an Ellingham diagram, the slope of the line for the formation of a metal oxide is positive. This indicates that:
The entropy change for the reaction is negative.
The reaction becomes less spontaneous at higher temperatures.
The free energy change becomes more negative at higher temperatures.
The enthalpy change for the reaction is positive.
The Ellingham diagram suggests that the reduction of alumina () by magnesium (Mg) is feasible. Which of the following statements best explains this feasibility?
The Gibbs free energy change for the overall reaction is positive.
The enthalpy change for the reaction is positive.
The entropy change for the reaction is negative.
The Gibbs free energy change for the overall reaction is negative.
Why does the vs. T curve for the formation of from have a negative slope in the Ellingham diagram?
Increase in entropy due to increase in gaseous moles.
Decrease in entropy due to decrease in gaseous moles.
Constant entropy as gaseous moles remain the same.
The reaction is exothermic.
The Ellingham diagram does NOT directly account for which of the following factors that can influence the feasibility of a reduction reaction?
Temperature
Partial pressure of gases involved
Kinetics of the reaction
Entropy change of the reaction
Which method of purification is represented by the following equation:
Zone refining
Cupellation
Polling
Van Arkel
According to the Ellingham diagram, which of the following metals cannot be used to reduce alumina ()?
Mg
Ca
Cu
Na
What does a line with a positive slope on an Ellingham diagram represent?
An increase in entropy
A decrease in entropy
An increase in enthalpy
A decrease in enthalpy
