Is impossible to determine. How much heat did the substance lose to completely change from liquid to solid? Potential energy of the substance remains constant during which segment or segments? Phase change diagram answer key.com. The temperature remains constant throughout a phase change, thus the final temperature would still be 100°C. So, the kinetic energy is increasing during segments 1, 3, and 5. As condensation forms on a glass of ice water, the temperature of the air surrounding the glass __________. 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! Therefore the substance is boiling during segment 4.
The total energy requirement to heat a given amount of steam is found by mulitplying the the number of moles to be vaporized by the energy of vaporization per mole. Water has a higher vapor pressure at high elevation. As a substance condenses from the gas phase to the liquid phase, it loses energy in the form of heat loss. However, in the event of a phase change (water melts at 273K), the heat of fusion or vaporization must be added to the total energy cost. Using the heat curve, define the segment time(s) that the kinetic energy of the substance is increasing. Example Question #10: Energy Of Phase Changes. The atmospheric pressure is lower at high elevations. So, the potential energy of the molecules will increase anytime energy is being supplied to the system but the temperature is not increasing. Phase diagram worksheet answer key. There is a lower heat of fusion at higher elevation. How much energy is required to boil 9 moles of liquid water at its boiling point, and what is the temperature of the water vapor product? Therefore the potential energy is increasing during segments 2 and 4.
140 C. Temperature ( o C) 120 D. 80. Explain your answer. Hydrogen bonds are easier to disrupt at high elevation. What is the phase or phases of the substance during segment C? The flat areas of the graph represent areas in which heat is being added, but there is no corresponding increase in temperature. The beginning of segment 5. Set E: Phase change diagram Objective: To test your ability to interpreted phase change diagrams. What is the total length of time that the substance undergoes fusion? In the given heating curve, which segment(s) correlate to a mixture of phases? B C. Temperature ( o C) 50.
Rather, this added heat energy is used to break the intermolecular forces between molecules/atoms and drive phase changes. All AP Chemistry Resources. When kinetic energy is increasing molecules are simply moving faster. The formula becomes: Example Question #4: Energy Of Phase Changes.
Therefore only the segments that are at an incline will have the substance in just one phase. The higher the elevation, the denser water is. Is the total length of time it took for the substance to change from liquid to solid? In the heating curve shown above, at what point do the molecules have the highest kinetic energy? 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.
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44. All Rights Reserved. Heat is transferred from the water to the air, resulting in an increase in the temperature of the air. Therefore, when the potential energy is increasing is when the molecule is changing phases. The substance is losing heat at a rate of 155 Joules per minute. When vapor pressure is equal to the atmospheric pressure, water boils. The specific heat capacity of water is, and water's heat of fusion is. In this case it is labeled as segment 3.
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. Why does water boil at a lower temperature at high elevation? Copyright©2010 E3 Scholastic Publishing. Which segment or segments represents a time when the substance is in one phase? At which segment or segments is the substance average kinetic energy increasing? Using the heating curve, determine which segment(s) relate to an increase in potential energy.
Which segment represents the substance as it is boiling? Which segment represents only the liquid phase? Page 19 - Surviving Chemistry Workbook Preview. 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 will be the highest when the temperature is the highest.
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. How much heat must be added to raise a sample of 100g of water at 270K to 280K? At what temperature are the solid and liquid phases exist at equilibrium? Is the diagram a heating curve of water or of a different substance?
Step-by-step PowerPoint notes will guide your stu. Describe the change in kinetic energy of the substance during segments A and segment B? The atmospheric pressure is lower at high elevation, so water boils at a lower temperature. Therefore there is a mix of molecules during segments 2 and 4. Remember, temperature is a measure of the average kinetic energy. Therefore the kinetic energy increases whenever the temperature is increasing.
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