Interpretation:
The proof that the test tubes contain three different chemical compounds should be given. Also, the minimumnumber of melting points needed to proof that should be determined.
Concept introduction:
Temperature at which an element changes from the solid state to the liquid state is known as melting point or sometimes liquefaction point. At the melting point, both solid and liquid phase coexist in equilibrium. It depends on the pressure and is normally defined at the standard pressure
Mixed melting point is a techniquethat is used to identify chemical compounds. It is used when a substance of known identity and melting point is mixed with another unknown substance to calculate its melting point.
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Chapter 3 Solutions
Macroscale and Microscale Organic Experiments
- Al(s) + Cl2 (g)→AlCl3 (s) Express your answer as a chemical equation. Identify all of the phases in your answer.arrow_forwardQs2. You are given two similar looking white, organic crystalline solids and determine their melting points. You find one to be 156-158° C and the other to be 154-157 C. Suggest the experiment to determine whether the two substances are identical or different. Briefly describe how the results obtained would differ if the substances were identical or if they were differentarrow_forwardWhy do impure compounds normally have a lower melting point than the pure substance?arrow_forward
- What does the line separating the liquid phase from the gas phase represent? what is the name of that linearrow_forwardWhat is formed when gas is enclosed in a chamber then liquified under very high pressure? * What latent heat value signifies the lost of heat during a phase change? What is the unique temperature and pressure at which the three phases of a substance are in equilibrium with each other? * Which liquid crystal is of pharmaceutical significance? *arrow_forwardBalance each chemical equation. NH2OH(g)→NH3(g)+N2(g)+H2O(g) Express your answer as a chemical equation. Identify all of the phases in your answer.arrow_forward
- Blue CuSO4·5H2O crystals release their water of hydration when heated. How many phases and components are present in an otherwise empty heated container?arrow_forwardDetermine what is being asked in each item. What specific type of intermolecular force causes the increase of boiling point in alcohol molecules? What reduces the intermolecular attraction in hydrocarbons resulting to a decrease of boiling? What is the measurement for the average kinetic energy of particles? What substance is found to be liquid under pressured conditions but is gaseous in normal atmospheric pressure? What is formed when gas is enclosed in a chamber then liquified under very high pressure? * What is the vertical distance from mean sea level to the site being measured that affects boiling point? What is the process of vaporization called? What latent heat value signifies the lost of heat during a phase change? What is the property of molecules and materials of having identical physical properties in all directions? What is the ability of a solid substance to crystallize into more than one different crystal structure? What is the unique temperature and pressure at which…arrow_forwardWrite the balanced equation for the rusting of iron in which iron reacts with oxygen to form iron(III) oxide. Phases are optional.arrow_forward
- There are 3 solids from different compounds: HF, FeCl3, and Csl (cesium iodide). These three solids are placed in 3 different containers, and are randomly labeled as A, B, and C. It is found that (1) the solid in container A has the highest melting point and (2) the solid in container B has the lowest melting point. Which of the following statements is correct about these solids? a. FeCl3 (s) in container B. O b. FeCl3 (s) in container C. O. HF (s) in container A d.Csl (s) in container C.arrow_forwardA pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate and the temperature recorded as time passes. Here is a graph of the results: temperature (°C) 160. 140. 120. 100. 80. 0. 10. What is the melting point of X ? Use this graph to answer the following questions: heat added (kJ/mol) What phase (physical state) of X would you expect to find in the flask after 18 kJ/mol of heat has been added? 20. 000 30. 11°C (check all that apply) solid liquid gas 40.arrow_forwardA pharmaceutical company develops a new drug and collects data about its phases. Given the following information, sketch and label a phase diagram for the new drug. At atmospheric pressure its melting point is 75°C and its boiling point is 157°C Its triple point is 82°C and 2.41×10−3 atm Its critical point is 342°C and 61 atm It is less dense in the liquid phase than the solid phasearrow_forward
- Macroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks Cole