What Is the Sign of ΔH (System)and ΔS (System)if a Chemical

question 9

Multiple Choice

What is the sign of ΔH (system) and ΔS (system) if a chemical reaction is spontaneous only at lower temperatures under standard conditions?

• A) ΔH (system)is negative,and ΔS (system)is negative.
• B) ΔH (system)is positive,and ΔS (system)is positive.
• C) ΔH (system)is positive,and ΔS (system)is negative.
• D) ΔH (system)is negative,and ΔS (system)is positive.
• E) None of these

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Definitions:

Heteroscedasticity

A condition in regression analysis where the variance of errors or the variability of the dependent variable differs across values of an independent variable.

Variance

A measure of the dispersion representing the average of the squared differences from the mean.

Observation

An act of noting and recording something, typically used in the context of data collection in scientific studies or research.

Errors

The differences between observed values and the values predicted by a model, showcasing the discrepancies that can arise in data analysis.