Geddy and Neil are measuring the melting point of their starting material prior to their lab experiment: despite analyzing the exact same sample from the same jar, they both measured rather different values, with one measuring a melting point of 141.3–153.6°C and the other measuring a melting point of 143.4–144.9°C. Propose a reason explaining the discrepancy.
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- A student measured the melting point range of an unknown solid to be 81.9 to 82.3 degrees celsius. a) Is the compound pure? b) Can you identify the compound from Table 2.2? c) If yes, what is the compound? Table 2.2: Solid - Melting Point (Celsius) Benzoic Acid - 122 Acentanilide - 114 Acetamide - 82 Biphenyl - 71 p-Dimethoxybenzene - 59 p-Dichlorobenzene - 54 Benzophenone - 48You and your partner independently measure the melting point of the same pure sample .you observe q melting point of 126.5-129 c while your pwrthber observes a melting point of 126-132 how can two different results be obtained? Provide at least three possible explanationA pure compound has a literature melting point of 136 °C. In the laboratory, three different students recrystallized crude samples of the compound and measured the melting point range for the crystals that they recovered. In the order listed, which melting point ranges best correspond to a ‘pure’ compound, an ‘impure’ compound, and a compound that was heated too quickly while measuring its melting point? a. 132 – 136 °C; 134 – 139 °C; 136 – 137 °C b. 132 – 136 °C; 136 – 137 °C; 134 – 139 °C c. 134 – 139 °C; 132 – 136 °C; 136 – 137 °C d. 134 – 139 °C; 136 – 137 °C; 132 – 136 °C e. 136 – 137 °C; 132 – 136 °C; 134 – 139 °C f. 136 – 137 °C; 134 – 139 °C; 132 – 136 °C
- A student measured the melting point range of an unknown solid to be 72.4 to 78.6 degrees celsius. a) Is the compound pure? b) Can you identify the compound from Table 2.2? c) If yes, what is the compound? If no, what compounds from Table 2.2 can be excluded? Table 2.2: Solid - Melting Point (Celsius) Benzoic Acid - 122 Acentanilide - 114 Acetamide - 82 Biphenyl - 71 p-Dimethoxybenzene - 59 p-Dichlorobenzene - 54 Benzophenone - 48Prepare 750 mL of 6.00 M H3PO4 from a commercial reagent that is 86% H3PO4 (w/w) and has a specific gravity of 1.711. If my melting point range of my recrystallized materal is from 118-125 degrees Celsius, what does this tell me about the purity of my recrystallized material?
- When checking the melting point of your impure sample, what temperature should you set as the starting temperature (the SET temperature) and what should the ramp rate be? For example, if the sample is believed to melt at 70°C, at what temperature should you begin to heat the sample?A compound's literature melting point is118°C under normal atmospheric pressure. Which of the following samples must have the highest percentage of the compound? (experimental melting point ranges are given) a. Sample 1 (MP 108-116 degree C) b. Sample 2 (MP 113-114 degree C) c. Sample 3 (MP 115-117 degree C) d. Sample 4 (MP 120-127 degree C)Chemistry 1) Take 1 mL of a liquid bacterial culture (aka original culture) and mix it with 9 mL of uninoculated liquid medium in tube A.Take 0.1 mL from tube A and mix it with 9.9 mL of uninoculated medium in tube B.Take 0.2 mL from tube B and mix it with 99.8 mL of uninoculated medium in tube C.Take 0.05 mL from tube C and mix it with 19.95 mL of uninoculated medium in tube D. Take 0.25 mL from tube D and mix it with 99.75 mL of uninoculated medium in tube E. - If the original culture density were 3 x 107 cfu/mL, how many cfu would there be in 20 μL of dilution tube C? 2) If the absorbance (420 nm) of a 2 mL cell suspension is 0.28 absorbance units, and the cells are dried down to give 0.58 mg dry weight, and a typical cell is 2.9 x 10-13 g dry weight, what was the original density of the culture (in cells/mL)?
- What is the weight percent of toluene in a mixture of toluene and n-heaxne that has a spevific gravity of 0.832Filtration of samples A, B, and C show no residue left. After letting them dry in different beakers, SAmple A remains no residues. Sample B shows crystal leftovers, and sample C show brown film on the beaker walls. This means that: a. Two or more samples are heterogenous b. Two or more samples are homogenous c. all sample have 2 or more phases d. all samples are pure2-needing help with parts d-g only