1. Why is energy needed to boil water? 2. When water is heated, the temperature eventually reaches a constant value (as in lines 2 and 4 on the graph) and forms a plateau on the graph. What does the plateau indicate? 3. 175 g of water (1) was heated from 15°C to 88°C. How many kilojoules were absorbed by the water?
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- Procedure part 1: Once the distillation is set up, 20.00 g of cyclohexanol is massed out and 3.00 ml of concentrated phosphoric acid is added as a catalyst to the boiling flask. Two boiling chips are added and the distillation can begin. The cooling water for the condenser is turned on and the flask is heated gently so that the temperature of the vapor does not exceed 135oC. The heating is continued until all but 1 -2 ml of residue remain in the boiling flask and it turns a dark yellow color. At this point the heat is turned off and the remaining liquid is placed into a waste container. In the receiving flask at the opposite end of the distillation apparatus, you will notice that the product appears in two layers. Question 1: Based on what we learned about the density of organic compounds, which layer is the organic layer (top or bottom)? Cyclohexanol + water Question 2: Looking at the reaction listed at the start of the lab, what two compounds are making the two…This refers to a point wherein both liquid phases have the same composition. Hence, extraction is not possible. Liquidus Plait point Convergence point Tie linesFAlpOLSdkkCb8p7Lki9hSE-PEqyqO02a33Gom9YvugXuốb5uYkOPEUw/formResponse plify ern. Karely 1. Serena mixed two samples together: a gray solid that smells like flowers and a gray solid that smells like bleach. She analyzed the results and found two ending substances. One of the ending substances was a white solid. This ending substance is made up of the repeating group of atoms shown below. Which of the diagrams to the right shows the repeating groups of atoms that make up the samples Serena mixed together? Sample 1 Sample 2 An ending substance Sample 1 Sample 2 Properties: Bray solid mells like flowers Properties: gray solid smells like bleach Properties: white solid Sample 1 Sample 2 smells sour Sample Sample 1 Sample A. Diagram A B. Diagram B C. Diagram C O O O
- During the microscale boiling-point determination of an unknown liquid, heating was discontinued at 154°C and the liquid immediately began to enter the inverted bell. Heating was begun again at once, and the liquid was forced out of the bell. Heating was again discontinued at 165°C, at which time a rapid stream of bubbles emerged from the bell. On cooling, the rate of bubbling gradually diminished until the liquid reached a temperature of 161°C and entered and filled the bell. Explain this sequence of events. What was the boiling point of the liquid?Which technique is more best from flirtation and centrifugation and how??Grain boundaries are (1) chemically reactive than the grains themselves because of the (2) energy state of grain boundaries. (1) = more, (2) = higher. (1) = more, (2) = lower. (1) = less, (2) = higher. (1) = less, (2) = lower. %3D
- Imagine you are an organic chemistry student who isolates a crude sample of salicylic acid following the Unit 2 experiment, and then you recrystallize that sample in an attempt to purify it. After a week of drying in the hood, you analyze the recrystallized product by melting point to determine purity. You divide the recrystallized product into two MP capillary tubes. You analyze Sample 1 fırst and then dispose of the tube and sample. After the MP apparatus has cooled, you then analyze Sample 2. You record the following data in your lab notebook: The reported literature value for pure salicylic acid is 159 °C. Sample 1 start = 157.5 °C Sample 1 end = 160.5 °C Sample 2 start = 157.3 °C Sample 2 end = 158.8 °C Using all these data, draw a conclusion about the purity of your sample (i.e., "it is pure" or "it is not pure") and explain or support your conclusion. Also provide any hypotheses you have regarding all of these data. Avoid phraseology/words such as "I feel..." or "I believe..",…Why in microstructure visualization etchants are used? ExplainVolatile and semi-volatile compounds can be analyzed by GC
- (b) TABLE 3 shows data phase equilibrium diagram for carbon dioxide. TABLE 3 Pressure (atm) Temperature (°C) Triple point Critical point 5.2 -57 73 31 (i) Sketch a phase diagram for carbon dioxide (ii) Explain the phase changes that could possibly occur when a sample of carbon dioxide in a closed vessel under 1 atm pressure and a temperature of -78°C is pressurised isothermally to 10atm, followed by isobaric heating to 20°C.Take 100ml of the Foam Bath that contains Sodium Laureth Sulphate Cocamide DEA and add sodium chloride solution in incremental amounts whilst stirring, until more than 5% has been added. Note any physical changes that occur during the addition and stirring process.Consider you have aqueous bluish copper (11) chloride and Zn metal. Describe the given materials as to color, texture and as to kind of matter. Picture the following samples: Fe filings, talc powder and magnet. Tabulate your observation as to color, texture and effect on magnet and the kind of matter.