Sublimation: the transition of a substance directly from the solid to the gas phase without passing through an intermediate liquid phase; an endothermic phase transition that occurs at temps and pressures below a substance's triple point in its phase diagram; reverse is desublimation or deposition; as you observe an ice crystal in freezing air, an occasional molecule will gain enough energy to break away from its neighbors and enter into the air above

Sublimation: the transition of a substance directly from the solid to the gas phase without passing through an intermediate liquid phase; an endothermic phase transition that occurs at temps and pressures below a substance's triple point in its phase diagram; reverse is desublimation or deposition; as you observe an ice crystal in freezing air, an occasional molecule will gain enough energy to break away from its neighbors and enter into the air above

Energy Changing Processes: In this video Paul Andersen explains how energy can enter and leave a system. The amount of energy a substance can receive through heating or lose through cooling is measured using the specific heat capacity. Phase changing energy from solid to liquid is known as the enthalpy of fusion and phase-changing energy from a liquid to a gas is known as the enthalpy of vaporization. The energy leaving or entering a chemical reaction is the enthalpy of reaction.

Energy Changing Processes: In this video Paul Andersen explains how energy can enter and leave a system. The amount of energy a substance can receive through heating or lose through cooling is measured using the specific heat capacity. Phase changing energy from solid to liquid is known as the enthalpy of fusion and phase-changing energy from a liquid to a gas is known as the enthalpy of vaporization. The energy leaving or entering a chemical reaction is the enthalpy of reaction.

What are the phase changes? Phase changes going toward decreasing enthalpy of system are exothermic and have -ΔH and -ΔS. Sublimation>vaporization>fusion for changes in enthalpy and entropy.

What are the phase changes? Phase changes going toward decreasing enthalpy of system are exothermic and have -ΔH and -ΔS. Sublimation>vaporization>fusion for changes in enthalpy and entropy.

Calorimetry: n this video Paul Andersen describes the history of calorimetry and explains how it can be used to measure energy changes in a system. The specific heat of water is well established and so as a system releases or absorbs energy from a surrounding water bath it can be measured. Calorimeters can be used to measure the specific heat capacity of a substance as well as the enthalpy of fusion, vaporization, and reaction.

Calorimetry: n this video Paul Andersen describes the history of calorimetry and explains how it can be used to measure energy changes in a system. The specific heat of water is well established and so as a system releases or absorbs energy from a surrounding water bath it can be measured. Calorimeters can be used to measure the specific heat capacity of a substance as well as the enthalpy of fusion, vaporization, and reaction.

heatcurve.gif 640×480 pixels; animated heat-coming curve at http://brianbennett.org/images/gif/heatcurve.gif

heatcurve.gif 640×480 pixels; animated heat-coming curve at http://brianbennett.org/images/gif/heatcurve.gif

Back to Basics: Acids, Bases & the pH Scale. A refresher course on acids, bases, and the pH scale to better understand the meaning behind your pH test strip results. | Precision Laboratories Blog

Back to Basics: Acids, Bases & the pH Scale

Back to Basics: Acids, Bases & the pH Scale. A refresher course on acids, bases, and the pH scale to better understand the meaning behind your pH test strip results. | Precision Laboratories Blog

No estaría nada mal que al terminar la ESO los estudiantes supiesen bien esta tabla. Les ahorraría tiempo y disgustos. Check Out this Free #MCAT Math Study Guide Cheat Sheet -

No estaría nada mal que al terminar la ESO los estudiantes supiesen bien esta tabla. Les ahorraría tiempo y disgustos. Check Out this Free #MCAT Math Study Guide Cheat Sheet -

Elements by Orbital (2003). This representation shows the Pauli exclusion principle, the aufbau principle and Hund's rule in action.

Elements by Orbital (2003). This representation shows the Pauli exclusion principle, the aufbau principle and Hund's rule in action.

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