Ch.6 - Thermochemistry WorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: A closed system.If the piston is pulled upward so that it sits halfway between the position shown and the top of the cylinder, is the system still closed?

Solution: A closed system.If the piston is pulled upward so that it sits halfway between the position shown and the top of the cylinder, is the system still closed?

Problem

A diagram shows a piston as containing a system consisting of H2 (gas) and O2 (gas).  The surroundings are the cylinder, piston, and everything else.  Energy can enter or leave the system as heat or as work done on the piston, but matter cannot enter or leave the system.
A closed system.

If the piston is pulled upward so that it sits halfway between the position shown and the top of the cylinder, is the system still closed?

Solution

In this problem, we are asked if the system is still closed even if the piston is pulled upward so that it sits halfway between the position shown and the top of the cylinder.

Recall that:

  • Our system is simply our chemical reaction. Anything outside of that is considered our surroundings
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