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A student was in a rush and skipped elution with ethanol and went straight for water. How would the student’s separation be affected?
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- The mass of an iron nail is measured before and after being placed in a beaker of water for 2 days. It is found that 0.059 g of iron (3) oxide (rust) was produced over the 2-day period. What mass of iron in the nail reacted with the water? Assume the nail is pure iron2. Two students weigh a gelatin capsule (0.112g). Next they add pieces of aluminum-zinc alloy to the capsule and weigh the capsule and alloy (0.271g). They weigh out an empty beaker (141.209) and begin the experiment. After the reaction, they determine the mass of the beaker (with displaced water) to be 307.712g. The temperature of the water was 21 degrees Celsius and the barometric pressure was 745.9 mmHg. Fill the calculation section of the table on the following page.What is the difference between a homogeneous and a het-erogeneous mixture?
- Archimedes, a famous Greek scientist, was given a problem by King Hieron II of Syracuse (Sicily). The king suspected that his crown, which was supposed to be made of pure gold, contained some silver alloy, and he asked Archimedes to prove or disprove his suspicion. (It turned out that the crown did not contain silver.) How would you experimentally determined whether or not the crown was pure gold? (Hint: The method came to Archimedes when getting into a full bathtub. See the footnote in Experiment 22 for Archimedes’ solution.)Define chemistry and explain how burning wood isrelated to chemistry.The thermostat shows that the room temperature is 21.7°C. Convert 21.7°C to Kelvin and Fahrenheit units. Be sure to answer all parts. (a) K (b) PF
- Chemistry (b) A sampling plan is necessary to ensure that a laboratory sample is truly a representative of the entire population. (i) Describe the goals of the sampling plan. "It is possible to determine whether the population is homogeneous or heterogeneous if a single sample is collected and analyzed." Comment on this statement. (ii)1. How would the accuracy of your determined Keq change if all of your volume measurements were made with graduated cylinders rather than pipets?6c-please see attached Ka=2.39x10^-4
- A chemist analyzes a sample of iron ore furnished by the National Institute of Standards and Technology, NIST. He obtains the following results: = 10.52%, s = 0.05, n = 10. The NIST's value for this sample is 10.60% Fe. Is the chemist's result (mean) significantly different at the 95% confidence level?PART 2 Density of Gravel The mass of the empty weighing boat was measured. Then the weighing boat was filled with gravel, and the mass of the weighing boat and the gravel was measured. Mass of weighing boat = 0.98 g Mass of weighing boat and gravel = 58.98 g We are interested in the mass of the gravel. (a) Gravel is matter. Why? (b) What is the name of this method of measurement of mass of a substance? (c) What is the other method of measurement of mass of a substance? (d) What type of balance are we using in this experiment? (e) Calculate the mass of the sample of gravel.A student determines the molar mass of a liquid unknown by the method used in this experiment. She found that the equilibrum temperature of a mixture of ice and water was 1.0 degrees C on her thermometer. When she added 11.1 g of her unknown sample to the mixture, the temperature, after thorough stirring, fell to -3.0 degrees C. She then poured off the solution through a screen into a beaker. The mass of the solution was 90.4 g. Kf=1.86 degrees C/m How much water was in the decanted solution? What did she find to be the molar mass of the unknown liquid, assuming she made the calculation properly?
