An_intervention_presentation._T7_SCN-620

23. Use dimensional analysis

A group of students performed a melting point experiment to study the physical properties of ionic and covalent solids. The data collected are shown in the table.  Solid Sample Melting Point (oC)  Time Elapsed (min) Table Sugar (sucrose) 186 18 Table Salt (sodium chloride) 500 (not observed) 30  Paraffin Wax 37 4  Vegetable Lard 50 >5 Using the information contained in the table, what is the BEST explanation for the results?A    The melting point of sodium chloride was not observed because ionic solids do not melt, whereas sugar, wax, and lard melted because they are softer than salt.B    The melting points of covalently bonded solids tend to be lower than ionic solids. The melting point of sucrose was greater than the wax or the lard because sucrose has stronger bonds than wax or lard.C    The melting point of sodium chloride was not observed because ionic solids are composed of positive and negative ions that do not melt; whereas, the…

Concentrated sulphuric acid is used in this experiment to O help the crystal growth of acetylsalicylic acid speed up the reaction of aspirin synthesis increase the activation energy O avoid impurities getting trapped into the aspirin crystals P Type here to search

Two sets of measurements generate the following values for the concentration of Ca²+. Average Standard Deviation Measurement Set 1 140.55 ppm 8 ppm Measurement Set 2 137.72 ppm 18.453 ppm The concentration is known to be 139.6 ppm. State which Measurement Set is more precise and which is more accurate. Clearly explain your reasoning.

After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had a concentration of 4.692 x 10–5 M. If 0.132 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder? Report your answer as a percentage with two places after the decimal. Do not include the percentage sign in your answer. Pay attention to units. You are trying to find the mass percentage of red dye, so you need to know each variable in the equation in Appendix B. Note that the percent by mass equation should be multiplied by 100. There may be some useful conversion factors in the experimental procedure.

In a particular class, exams are worth 50%50% of the overall grade, quizzes are worth 30%30% of the overall grade, homework is worth 15%15% of the overall grade, and class participation is worth 5%5% of the overall grade. A particular student has earned an average score of 83.0%83.0% on the exams, 71.6%71.6% on the quizzes, 90.0%90.0% on the homeworks, and 100.0%100.0% on class participation. What is this student's overall grade in the course? Report the answer with one digit after the decimal point.

After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had an FD&C Red 40 concentration of 1.086 x 10–5 M. If 0.133 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder?

The Covid-19 pandemic has many experts commenting on the science associated with the virus - origins, vaccines, monoclonal antibodies, masks, social distancing.  It is important to consider what the experts say, but to also evaluate their statements.  We will start with the scientific method.  I want you to outline the scientific method from what you have been taught in previous classes.  You can list steps, parts, process, short descriptions, whatever.  If not taught in previous classes, then you will make your best guess about it.

This is my 2nd attempt to receive help with this problem. The previous expert confused me by saying the answer is less than 109.5? Does that mean it should be 90?  Please provide clarity instead of adding confusion; otherwise the payer loses a question for assistance.  Thank you.

1. For each field, which problem is being addressed by the consumer product? 2. What are some chemical components of the consumer products?

As viewed from Earth, most stars appear to move across the sky each night because A stars orbit around Earth   B Earth rotates on its axis   C stars revolve around the center of the galaxy   D Earth revolves around the sun

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of glycerol, pentane, acetone, tetrahydrofuran, and dimethyl sulfoxide. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density glycerol 1.3 g•cm pentane - 3 0.63 g·cm 3 0.79 g·cm аcetone tetrahydrofuran 3 0.89 g·cm dimethyl sulfoxide 1.1 g·cm Next, the chemist measures the volume of the unknown liquid as 0.683 L and the mass of the unknown liquid as 752. g. Calculate the density of the liquid. Be sure -3 Ox10 your answer has the correct number of significant digits. 1101 g·cm Given the data above, is it possible to identify the liquid? yes no

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of carbon tetrachloride, diethylamine, methyl acetate, tetrahydrofuran, and acetone.   The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from his collection of Material Safety Data Sheets (MSDS), the chemist finds the following information:

Four individuals are suspects in a car theft. A small amount of blood was left in the car, likely from when the thief forced the window. The blood sample was amplified and compared to samples from the suspects. Lanes I, II, III, and IV are the samples from the four individuals. The lane marked "evidence" is the sample from the car. I II III IV Evidence - Which suspects, if any, can be eliminated? II and III II and IV I and IV I, III, and IV I and III I, II, and III Incorrect

Histology stains that are used to create microscopic images originally came from the industry. clothing cosmetics healthcare automotive food

A chemist working as a safety inspector finds an unmarked bottle in a lab cabinet. A note on the door of the cabinet says the cabinet is used to store bottles of glycerol, carbon tetrachloride, pentane, tetrahydrofuran, and acetone. The chemist plans to try to identify the unknown liquid by measuring the density and comparing to known densities. First, from her collection of Material Safety Data Sheets (MSDS), the chemist finds the following information: liquid density glycerol -3 1.3 g-cm - 3 1.6 g cm carbon tetrachloride -3 0.63 g·cm pentane tetrahydrofuran -3 0.89 g·cm -3 0.79 g·cm acetone Next, the chemist measures the volume of the unknown liquid as 0.786 L and the mass of the unknown liquid as 991. g. Calculate the density of the liquid. Round your g. cm answer to 3 significant digits. yes Given the data above, is it possible to identify the liquid? no glycerol carbon tetrachloride pentane If it is possible to identify the liquid, do so. tetrahydrofuran acetone

Identify and provide an explanation of what “Separation Science” entails and its importance with the respect to the chemical analysis of food. Provide an example.

Chemical properties include (choose the best answer) Melting and boiling point Density Reactivity with other chemicals and molecules Solubility in various solvents

What would a scientist do to best communicate these data to other scientists in a presentation

Please answer question number 2  correctly with the correct answer. there is a picture of an example of a ''Dimensional analysis Format' below. please write out all work showing the math in dimensional analysis format. (please show all work)   Question 3: What is the molar mass of each of the following compounds?   A. C6H12O6   B. NaHCO3

Good day! Can you help me make a SCHEMATIC DIAGRAM to separate the components of a given mixture?  Please do explain the process step by step and why you have chosen that method/s for the separation. Thank you

What is the difference between a decigram balance and an analytical balance?

What is calibration and why is it essential in relation to food analysis? Provide examples.

Hawaii Carbon Dioxide Time-Series 425 CO2 Time Series in the North Pacific 8.30 Mauna Loa Atmospheric CO2 (ppm) ALOHA seawater PCO2 insitu (uatm) ALOHA seawater pH (insitu) 400- 160°W 158°W 156°W 8.25 23°N Station ALOHA 22 375- - 8.20 21° 20° Station Mauna Loa 8 350- 190 -8.15 325 8.10 300- 8.05 275- 8.00 2021 1958 1967 1976 1985 1994 Year" Data Mauna Loa (php.ondi noan ovproductsrendaeeee n mlo iN) ALOHA phahana soest hawaieduttdogstexionhl) ALOHA pi &C0, e calulated a insitu tempere fhom DIC A TA (measured from samples collected on Hawai Ocean Times-series IOT) enuisen) ing coys (Pelletier, v2so) wih constants Lueker et al. 2000, KSO Dickson, Total boron Lee et al. 2010, & KF secarb 2003 2012 What problem in the oceans does the data collected from 1985 to 2021 show?

Calculate the oral dosage in 200.0 mg tablets of Amoxicillin for a 66.0 lb child. Recommended dosage, divided every 8.00 hours = 20.0 mg/kg･day.