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Calculating Energy Changes at Phase Changes

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Calculating Energy Changes at Phase Changes. heating rate = 150 J/min. If the substance takes 4 minutes to melt, how much heat energy was used to melt it?. 150J/min x 4min = 600J. What is the melting point of this substance?. 50˚C. The boiling point?. 100˚C. Heat of Fusion.

Calculating Energy Changes at Phase Changes

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Phase Changes

The thermal or internal energy of a sample is the sum of all the kinetic and potential energies of all the atoms and molecules in a sample. Vaporization. Melting. Freezing. Condensation. Phase Changes. Solid. Gas. Liquid. Heating Curves. Heating Curves Animation.

870 views • 66 slides

Phase Changes

Phase Changes. What did one water molecule say to another water molecule about vapor? Don’t worry it’s just a phase he’ll cool down. Characteristics of Phase Changes. States of matter are also referred to as phases .

349 views • 11 slides

Phase Changes

Phase Changes. Matter exists in three physical states: Solid Liquid Gas When matter is converted from one physical state to another, a phase change occurs. A change in the physical state of a substance. Phase Changes. You should know what phase change occurs for each of the following:

1.42k views • 36 slides

Calculating energy changes with phase changes

Calculating energy changes with phase changes. SC6 Students will understand the effects motion of atoms and molecules in chemical and physical processes. a. Compare and contrast atomic/molecular motion in solids, liquids, gases, and plasmas.

251 views • 16 slides

Calculating heat changes

Calculating heat changes. Section 11.4. After reading Section 11.4, you should know:. What Hess’s Law is How to apply Hess’s Law to a chemical equation How to calculate the heat of formation for a given chemical equation. Hess’s Law.

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Phase Changes

Phase Changes. Surface molecules are only attracted inwards towards the bulk molecules. Sublimation : solid  gas. Vaporization : liquid  gas. Melting or fusion : solid  liquid. Deposition : gas  solid. Condensation : gas  liquid. Freezing : liquid  solid.

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Phase Changes

Phase Changes. By Akum Deol. Key. =. Molecule. =. Heat. =. Electron. Picture = Example. Solid. Facts: Solids have definite shape, volume, and density. Solid molecules are tightly packed and have the least amount of energy. Solid. Melting. Adding the amount of energy. Heating up.

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Energy and Phase Changes

Energy and Phase Changes. Energy and Phase Changes. Three states or phases of matter Solid Liquid Gas Energy is involved in every phase change. Some require energy to occur ( endothermic ) Some release energy ( exothermic )

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Phase Changes

Phase Changes. Review: 3 Phases of Matter. Solid Liquid Gas. What is a Phase Change ?. Is a change from one state of matter (solid, liquid, gas) to another. Phase changes are physical changes because: - It only affects physical appearance, not chemical make-up.

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Phase Changes

Phase Changes. Chp 10. Phase Diagrams. Phase diagram = relates physical states of matter (solid, liquid, gas) to temperature and pressure. Phase Diagrams. Triple Point : the only set of conditions where all three physical states can exist in equilibrium. Phase Diagrams.

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Phase Changes

Phase Changes. How much energy does it take?. Changes in Phase. It takes energy to go from solid to liquid and liquid to gas. The change from one phase to another takes a little extra push of energy in order to get to that next phase. Energy Diagram for Phase Changes. Changes in Phase.

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Phase Changes

Phase Changes. Any time the state of matter changes, intermolecular forces are “created or destroyed” This requires energy (think temperature or pressure). Phase Changes. Evaporation vs. Boiling Evaporation occurs when particles at the surface of a liquid become a gas.

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Phase Changes

Phase Changes. exothermic. endothermic. Phase Changes. sublimination. vaporizing. melting. solid. liquid. gas. condensing. freezing. Phase changes and their enthalpy changes. Figure 12.2. Figure 12.1. Heats of vaporization and fusion for several common substances. Figure 12.3.

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Phase Changes

Phase Changes. “It’s just a phase”. States of Matter. Solid, liquid and gas (plasma and BEC). Changes between states are called “phase changes”. Caused by a change of heat or pressure. More often heat. HEAT and TEMPERATURE are not the same thing. Temperature.

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Phase Changes

Phase Changes. What are Some Characteristics of Solids?. Have a fixed shape and volume in this state. Not easily compressible because there is very little space between particles. Does not flow because the particles are held rigidly. What are Some Characteristics of Liquids?.

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Calculating energy changes

Calculating energy changes. Heating curve of water. Cooling Curve of Water. Phase diagram. Energy (heat) may be expressed in joules or calories. 1 calorie (cal) = 4.184 joules (J) How many joules in 60.1 calories? How many calories in 28.4 J?. Energy conversions.

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Phase Changes

Phase Changes. All phase changes are physical changes, because the molecules do not change. All of these changes have changes in energy. freezing. This moves from _____________________ state to _______________________ state. The energy ____________________________________. melting.

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Energy Changes &amp; Phase Changes

Energy Changes &amp; Phase Changes. Heating &amp; Cooling Curves. It takes energy to heat stuff up!. For a pure substance in a single phase , we can calculate how much using Q = mC T. Q = energy in Joules m = mass in grams C = specific heat capacity T = change in temperature = T f - T i

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Phase Changes

Phase Changes. Phase. Depends on strength of forces of attraction between particles. Energy and Changes to Matter. Exothermic Change: A + B → C + D + energy Energy is released or “ ex”its Endothermic Change: A + B + energy → C + D Energy is absorbed or “ en”ters.

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Phase Changes

Phase Changes. Chapter 11. Vaporization. An endothermic process in which the intermolecular attractions of a liquid are broken releasing molecules as a gas. Δ H vap, T he heat of vaporization is the heat required to vaporize one mole of a liquid at 1 atm. Vapor Pressure.

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Calculating Energy Changes at Phase Changes

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Presentation Transcript

Phase Changes

Phase Changes

Phase Changes

Calculating energy changes with phase changes

Calculating heat changes

Phase Changes

Phase Changes

Energy and Phase Changes

Phase Changes

Phase Changes

Phase Changes

Phase Changes

Phase Changes

Phase Changes

Phase Changes

Calculating energy changes

Phase Changes

Energy Changes &amp;amp; Phase Changes

Phase Changes

Phase Changes

Energy Changes & Phase Changes