Concept explainers
Interpretation: The following statements to be explained by using given phase diagram of Sulphur.
Concept Introduction
Phase diagram: Under different temperature and pressure, physical states of the substance that are represented in graph are known as phase diagram. The temperature represents in X-axis and pressure in Y-axis.
Triple point: For given substance, three phases (solid, liquid and gas) are coexisting in
Critical point: In a phase diagram, a point at which both liquid and gaseous state of the substance having indistinguishable density.
Normal melting point: Normal melting point of the solids defined as the temperature at which solid melts at 1 atmospheric pressure. Normal melting point is differing from melting point in which pressure would be defined.
Normal boiling point: Normal boiling point of the liquid is defined as the temperature at which liquid boils at 1 atmospheric pressure. Normal boiling point is differing from boiling point in which pressure would be defined.
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Chapter 10 Solutions
Bundle: Chemistry, Loose-Leaf Version, 10th + OWLv2, 4 terms (24 months) Printed Access Card
- An amorphous solid can sometimes be converted to a crystalline solid by a process called annealing. Annealing consists of heating the substance to a temperature just below the melting point of the crystalline form and then cooling it slowly. Explain why this process helps produce a crystalline solid.arrow_forwardElemental carbon has one gas phase, one liquid phase, and two different solid phases, as shown in the phase diagram: (a) On the phase diagram, label the gas and liquid regions. (b) Graphite is the most stable phase of carbon at normal conditions. On the phase diagram, label the graphite phase. (c) If graphite at normal conditions is heated to 2500 K while the pressure is increased to 1010 Pa, it is converted into diamond. Label the diamond phase. (d) Circle each triple point on the phase diagram. (e) In what phase does carbon exist at 5000 K and 108 Pa? (f) If the temperature of a sample of carbon increases from 3000 K to 5000 K at a constant pressure of 106 Pa, which phase transition occurs, if any?arrow_forwardUse the phase diagram for sulfur for Question 75. The solid forms of sulfur are rhombic and monoclinic. (a) A triple point is defined as a temperature and pressure where three phases are in equilibrium. How many triple points does sulfur have? Indicate the approximate temperature and pressure at each. (b) Which physical states are present at equilibrium under these conditions? (i) 102 atm and 80 C (ii) 101 atm and 140 C (iii) 103 atm and 110 C (iv) 104 atm and 160 C Phase diagram for sulfur, for Question 75.arrow_forward
- Phase diagrams for materials that have allotropes can be more complicated than those shown in the chapter. Use the phase diagram for carbon given here to answer the following questions. (a) How many triple points are present and what phases are in equilibrium for each? (b) Is there a single point where all four phases are in equilibrium? (c) Which is more stable at high pressures, diamond or graphite? (d) Which is the stable phase of carbon at room temperature and 1 atmosphere pressure?arrow_forwardA common prank on college campuses is to switch the salt and sugar on dining hall tables, which is usually easy because the substances look so much alike. Yet, despite the similarity in their appearance, these two substances differ greatly in their properties, since one is a molecular solid and the other is an ionic solid. How do the properties differ and why?arrow_forwardThe phase diagram for elemental sulfur is shown in Figure 6.18. Figure 6.18 Phase diagram for elemental sulfur. a How many allotropes are shown? b What is the stable allotrope of sulfur under normal conditions of temperature and pressure? c Describe the changes to sulfur as its temperature is increased from 25C while at 1atm pressure.arrow_forward
- Answer the following questions using Figure 11.12: (a) What is the approximate equilibrium vapor pressure of water at 60 C? Compare your answer with the data in Appendix G. (b) At what temperature does water have an equilibrium vapor pressure of 600 mm Hg? (c) Compare the equilibrium vapor pressures of water and ethanol at 70 C. Which is higher? Figure 11.12 Vapor pressure curves for diethyl ether [(C2H3)2O], ethanol (C2H5OH), and water. Each curve represents conditions of T and P of which the two phases, liquid and vapor, are in equilibrium. These compounds exist as liquids for temperatures and pressures to the left of the curve and as gases under conditions to the right of the curve. (See Appendix G for vapor pressures for water of various temperatures.)arrow_forwardThe phase diagram for water over a relative narrow pressure and temperature range is given in Figure 9.19. A phase diagram over a considerably wider range of temperature and pressure (kbar) is given nearby. This phase diagram illustrates the polymorphism of ice, the existence of a solid in more than one form. In this case, Roman numerals are used to designate each polymorphic form. For example, Ice I, ordinary ice, is the form that exists under ordinary pressures. The other forms exist only at higher pressures, in some cases extremely high pressure such as Ice VII and Ice VIII. Using the phase diagram, give the approximate P and T conditions at the triple point for Ice III, Ice V, and liquid water. Determine the approximate temperature and pressure for the triple point for Ices VI, VII, and VIII. What is anomalously different about the fusion curves for Ice VI and Ice VII compared to that of Ice I? What phases exist at 8 kbar and 20 °C? At a constant temperature of −10 °C, start at 3 kbar and increase the pressure to 7 kbar. Identify all the phase changes that occur sequentially as these conditions change. Explain why there is no triple point for the combination of Ice VII, Ice VIII, and liquid water.arrow_forwardSilicon carbide, SiC, is a very hard, high-melting solid. What kind of crystal forces account for these properties?arrow_forward
- Consider the following data for xenon: Triple point: 121C, 280 torr Normal melting point: 112C Normal boiling point: 107C Which is more dense, Xe(s) or Xe(l)? How do the melting point and boiling point of xenon depend on pressure?arrow_forwardConsider the phase diagram and heating-curve graphs for Question 113. Draw corresponding heating curves for T1 to T2 at pressures P1 and P2. Label each phase and phase change on your heating curves.arrow_forwardDry ice, CO2(s) , does not melt at atmospheric pressure. It sublimes at a temperature of 78 °C. What is the lowest pressure at which CO2(s) will melt to give CO2(l) ? At approximately what temperature will this occur? (See Figure 10.34 for the phase diagram.)arrow_forward
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