Chemistry 30 Thermodynamics

skip to: page content | links on this page | site navigation | footer (site information)

Thermodynamics

Practice Questions: Entropy

This worksheet is also available in the following formats: Word | RTF | PDF

Module Index Practice Problems Assignments Student Lab Research Library

Teacher Resources

Module Overview Objectives Teacher Lab Other Resources Evaluation

Other Links

Check Your Answers Return to Notes Previous Page

Predict whether entropy is increasing (ΔS > 0) or decreasing (ΔS < 0)?
Give a reason for your answer.

steam condenses to water

solid CO₂ sublimes (changes directly from a solid to a gas)

N₂O_{4 (g)} → 2 NO_{2 (g)}

water is heated from 25°C to 50°C.

C₆H_{6 (l)} + O_{2 (g)} → 6 CO_{2 (g)} + 3 H₂O_(l)

Using a Table of Thermochemical Data, calculate ΔS for the following reaction. Is entropy increasing or decreasing? Is the system becoming more random or less random? Based on entropy changes only, would you predict the reaction to be spontaneous or not?

Na_(s) + ½Cl_{2 (g)} → NaCl_(s)

Check your answer

Return to Notes

Credits | Central iSchool | Sask Learning | Saskatchewan Evergreen Curriculum | Updated: 15-Jun-2006