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The concepts of accuracy and precision are not always easy to grasp. Here are two sets of studies:
(a) The mass of a secondary weight standard is determined by weighing it on a very precise balance under carefully controlled laboratory conditions. The average of 18 different weight measurements is taken as the weight of the standard.
(b) A group of 10,000 males between the ages of 50 and 55 is surveyed to ascertain relationship between calorie intake and blood cholesterol level. The survey questionnaire is quite detailed, asking the respondents about what they eat, smoke, drink, and so on. The results are reported as showing that for men of comparable lifestyles, there is a 40% chance of the blood cholesterol level being above 230 mg/dL for those who consume more than 40 calories per gram of body weight per day, as compared with those who consume fewer than 30 calories pergram of body weight per day. Discuss and compare these two studies in terms of the precision and accuracy of the result in each case. How do the two studies differ in ways that affect the accuracy and precision of the results? What makes for high precision and accuracy in any given study? In each of these studies, what factors might not be controlled that could affect the accuracy and precision? What steps can be taken generally to attain higher precision and accuracy?
The pKa of Tris, tris(hydroxymethyl)aminomethane (an acid commonly used in biochemistry), is 8.07. What is the Kb of this acid
calculate the heat of fusion of ice in calg and jg given the following informationinitial water temperature 51ocinitial
Calculate the mean molecular weight (kg/kmol) of the fuel c) Evaluate the air-fuel ratio on a mass basis.
Which one of the following molecules has a zero dipole moment? A. CO B. CH2Cl2 D. SO2 C. SO3 E. NH3 67. Indicate the type of hybrid orbitals used by the central atom in CCl4. A. sp B. sp2 C. sp3 D. sp3d E. sp3d2 68. What is the hybridization of th..
Write the electron configuration for each of the following. (Type your answer in noble gas notation using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2 and using the format CO2 for CO2.)
Calculate the work of expansion accompanying the complete combustion of 1.0g of glucose to carbon dioxide and (a) liquid water, (b) water vapour at 20 degrees Celsius when the external pressure is 1 atm
Problem- Assume 0.20 g of a monoprotic acid was titrated with 14.55 mL of magnesium hydroxide base with a concentration of 0.140 M. Calculate the molecular weight of the unknown acid.
For the above current at 5.45 V, how much electrical energy (in kw-hr) is consumed in the production of 1 kg of aluminum. (A kW-hr is 3.6 x106 J.)
If the specific heat of the solution is 4.18 J/g(g*degreesC), calculate delta H for the reaction, as written. Ba(s) + 2H2O(l) = Ba(OH)2 (aq) + H2 (g) Delta H=?
Determine the molar solubility of AgBr in a solution containing 0.200 M NaBr. Ksp (AgBr) = 7.7 * 10^-13
no electrons are emitted from the surface of metallic cs until the frequency of the radiation reaches 4.50 x 1016 hz.
Explain which alcohol would you expect to be more water soluble more g/ml or grams of the alcohol could dissolve in say 100 ml of water, ethanol or octanol and why
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