Pure benzophenone melts at 48.1°C. Your sample of benzophenone began to freeze at 47.0°C. When you repeated this measurement, the sample again began to freeze at 47.0°C. Give at least two reasonable explanations for this observation.
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- Pure benzophenone melts at 48.1 C. Your sample of benzophenone began to freeze at 47 C. When you repeated this measurement, the sample again began to freeze at 47 C. Give at least two reasonable explanations for this observation. You tried to read the thermometer when your solution containing the unknown began to freeze but were not certain if the reading was 43.5 C or 44 C so you decided to repeat this by melting the solidifying mass. The new reading you observed was clearly 41 C. What happened? Clearly explain your reasoning.3. A student is trying to identify an unknown solid based on its melting point. She noted that the compound began to melt at 172°C and finished melting at 177°C. Knowing it is possible for there to be impurities in the sample, is this compound more likely to be camphor or hydroquinone. Explain your reasoning. 4. A young chemist has synthesized what he believed to be acetaminophen. He measured the melting point of this newly formed compound to be 163-178°C. If the literature value for the melting point of acetaminophen = 169-170.5°C, would the young chemist be wise to consume this product for headache relief? Why or why not?The boiling point of a substance changes when other substances are introduced in the system. For example, water whose boiling point is at 100°C. If we add 5g of salt and bring it to boiling, the new boiling point would be at 215.6 °F. Calculate the Boiling point of your solution in degree Celsius and Kelvin. * O 330.48 °C, 603.63K 206.55 °C, 479.55K O 102 °C, 315.15K O 137.56 °C, 410.71K
- Suppose 1 g of lauric acid is added to 5 g of stearic acid. Predict the temperature at which this mixture will begin to melt, and justify your answer.A chemist is given a nonelectrolyte white powder for analysis. 38.7 g of this substance isdissolved in 100.0 g of water. It is determined that the resulting solution freezes at –4.0°C.Additionally, the elemental composition of the substance is identified and found to be 40.0%C, 6.7% H and 53.3 % O by mass. Find the molecular formula of this unknown white powderusing these experimental evidences (Kf of water: 1.86°C/m, C: 12 g/mol, H: 1 g/mol, O: 16g/mol)A student obtained a mixture of three organic solvents that are miscible in each other. Solvent XY has a boiling point of 67.8 °C, solvent XZ has a boiling point of 34.2 °C and solvent XD has a boiling point of 102.6 °C. Describe a detailed procedure that allows the student to purify this mixture.
- Acrylonitrile and ethyl acetate have the same boiling point: 77.20C. Which statement explains the outcome you would expect if a mixture of these two substances were distilled? * The acrylonitrile would vaporize first and the ethyl acetate would be left behinc O The ethyl acetate would vaporize first and the acrylonitrile would be left behind Both substances would vaporize at the same time so distillation would not be h Ethyl acetate is a solid so distillation would involve allowing the acrylonitrile to evaporate. Which statement best explains why structural formulas are good for depicting polymers?1. An organic student did an experiment extracting benzoic acid from a mixture of other organic substances. Other analyses of the obtained sample confirmed the presence of benzoic acid. The student also measured the melting point of the white solid, 117.4-121.6 oC. The literature mp of benzoic acid is 122.3oC. What can you conclude about the sample? Select one. Group of answer choices The sample of benzoic acid contains soluble impurities. The student obtained a good yield of benzoic acid. The sample of benzoic acid contains insoluble impurities. The student obtained pure benzoic acid from the extraction. The student obtained a poor yield of benzoic acid. 2. Which phenomenon are sometimes confused with melting during mp analysis? Select all that apply. Group of answer choices decomposition cracking shaking sagging/shrinking sweating solidifying 3. Study the bond types in the compound shown. Select the type(s) of intramolecular force(s) you predict the substance to exhibit. Select all…Pure naphthalene melts at 80 °C. Pure I-naphthol melts at 123°C. All mixtures of these two components show a single peak when heated and a 50 mol% mixture shows a single broad peak around 100 °C. What type of phase diagram does this suggest? Draw a hypothetical example of this type of phase diagram.
- When water is shaken with hexane, the two liquids separate into two phases. Which compound is present in the top phase, and which is present in the bottom phase? When water is shaken with chloroform, a similar two-phase system results. Again, which compound is present in each phase? Explain the difference between the two experiments. What do you expect to happen when water is shaken with ethanol (CH3CH2OH)?1. Which is more efficient for separating the components of a liquid mixture of a liquid mixture, simple or fractional distillation? Why? 2. Explain (in 1 – 3 sentences) how distillation works in separating simple mixtures.What would be a Prerequisite Skill or Prior Knowledge that a 5th grade science class should know about Volcano Eruptions before using the below standard? Standard Conduct an investigation to determine whether the mixing of two or more substances results in new substances.