The graph was drawn from data collected as a substance was heated at a constant rate. Use the graph an answer the following questions Temperature (°C) 180 140 120 100 80 60 40 Phase Change Diagram B 6 8 12 10 Time (minutes) 14 to a interesting fact.) Beyond point E, the substance is still in the are moving Substance Bolognium Unobtainium Foosium D At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has is added to the volume and shape. With each passing minute.. substance. This causes the molecules of the substance to or in a state. more rapidly which we detect by a °C. The solid rise in the substance. At point B, the temperature of the substance is. begins to At point C, the substance is completely. Material in this phase has volume and between minutes 5 and 9 was used to convert the substance from a Between 9 and 13 minutes, the added energy increases the shape. The energy put to the substance to a time from point D to point E, the liquid is, phase. Material in this phase has shape. The energy put to the substance between minutes 13 and 18 converted the substance from a 16 state. This heat energy is called the latent heat of vaporization. (An phase, but the molecules Melting point 20 °C 40 °C 70 °C 18. 20 of the substance. During the By point E, the substance is completely in the volume and as indicated by the increasing temperature. Boiling point 100 °C 140 °C 140 °C Which of these three substances was likely used in this phase change experiment? Explain:

Gmail FC www-awu.aleks.com/ YouTube = O STATES OF MATTER Using a phase diagram to predict phase at a given temperature... Maps Study the following phase diagram of Substance X. 0.8- 19 solid liquid pressure (atm) 100 gas F 200 temperature (K) Use this diagram to answer the following questions. Suppose a small sample of pure X is held at -243. °C and 0.4 atm. What will be the state of the sample? Suppose the temperature is held constant at -243. °C but the nreccure is decreased hv 03 atm What will hannen to the cample? Explanation Check ✓ (choose one) solid liquid gas (choose one) tv Search or type URL Ⓒ2022 McGraw H

The pressure above a pure sample of solid Substance X at - 72. °C is raised. At what pressure will the sample melt? Use the phase diagram of X below to find your answer. 0.8- Hiquid 0.4- solid gas 0. 200 400 600 temperature (K) Note: your answer must be within 0.05 atm of the exact answer to be graded correct. atm pressure (atm)

This is not a graded assigment, is just a practice problem.