Potential energy of the substance remains constant during which segment or segments? Describe the change in kinetic energy of the substance during segments A and segment B? The flat areas of the graph represent areas in which heat is being added, but there is no corresponding increase in temperature. Therefore the substance is boiling during segment 4. The following fomula gives the heat needed to generate a given temperature change for a substance of known specific heat capacity: where is the heat input in Joules, is the mass of the sample in grams, and is the specific heat capacity in. There is a lower heat of fusion at higher elevation. Phase change diagram answer key.com. Example Question #10: Energy Of Phase Changes. Finally, because liquids are higher in energy than solids, and lower in energy than gasses the middle slanted line must be the liquid phase. 140 C. Temperature ( o C) 120 D. 80.
Using the heating curve, determine which segment(s) relate to an increase in potential energy. Topics for each state include: pressure conversions, relationship between Kelvin and kinetic energy, phase changes, intermolecular forces, types of solids, phase diagrams and much more! At which segment or segments is the substance average kinetic energy increasing? Why does water boil at a lower temperature at high elevation? The higher the elevation, the denser water is. In this case it is labeled as segment 3. The temperature remains constant throughout a phase change, thus the final temperature would still be 100°C. Change of phase diagram. Which segment represents only the liquid phase? Which segment represents the substance as it is boiling? The enthalpy of vaporization gives the amount of energy required to evaporate a liquid at its boiling point, in units of energy per mole. Therefore the kinetic energy increases whenever the temperature is increasing.
The formula becomes: Example Question #4: Energy Of Phase Changes.
The atmospheric pressure is lower at high elevation, so water boils at a lower temperature. Step-by-step PowerPoint notes will guide your stu. Therefore the potential energy is increasing during segments 2 and 4. Phase change diagram answer key figures. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21. States of Matter - Intermolecular Forces, Kinetic Molecular Theory, Temperature, Pressure, Solids, Liquids, Gases, Distance learning, Remote learningThis bundle of lesson plans will teach your students about Kinetic Molecular Theory for solids, liquids, and gases.
Therefore we are looking for a segment that is flat (because the potential energy is increasing) and that is between the liquid and gas phases. In this case, gas phase is the highest energy phase, and liquids is the next highest. How much heat must be added to raise a sample of 100g of water at 270K to 280K? Therefore the kinetic energy will be the highest when the temperature is the highest. As a substance condenses from the gas phase to the liquid phase, it loses energy in the form of heat loss. 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44.
All AP Chemistry Resources. Is the diagram a heating curve of water or of a different substance? The given heating curve represents a substance in phases solid, liquid, and gas. So, the kinetic energy is increasing during segments 1, 3, and 5.
Which segment or segments represents a time when the substance is in one phase? Therefore only the segments that are at an incline will have the substance in just one phase. In the heating curve shown above, at what point do the molecules have the highest kinetic energy? What is the melting point of the substance? Heat is transferred from the water to the air, resulting in an increase in the temperature of the air. Is impossible to determine.