Energy Changes in Chemical and Physical Processes

When a chemical or physical process occurs, heat (enthalpy) may be absorbed or released by the system, and the entropy, or disorder, of the system may increase or decrease. Whether a process is spontaneous or not depends upon whether the change in enthalpy of the system and the change in entropy of the system 

How can you determine whether a chemical or physical process is spontaneous  

Always wear safety goggles, gloves, and a lab apron. Use extra care when handling all chemicals. 

Do not dispose of wastes in the sink or trash can. Never place a pipette in your mouth. 

What usually happens to the entropy of a system when a solid or liquid dissolves to form a solution  

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