Chemistry concepts and calculations
117302 questions • Page 2009 / 2347
When you are given a concentration for a compound, such as 1 M NaCl, it indicate
When you are given a concentration for a compound, such as 1 M NaCl, it indicates the number of moles of formula units per liter (formula-unit concentration). By multiplying the f…
When you are setting up your system landscape for large and/or multiple applicat
When you are setting up your system landscape for large and/or multiple application deployments, do you consider mainframe? If not, why not? If so, what factors are you considerin…
When you calculated k in the rate equation for the reaction of KMnO solution and
When you calculated k in the rate equation for the reaction of KMnO solution and H_2 C_2 O_4 solution you the same value under the condition of determination 1.2 and 3. What assum…
When you calculated k in the rate equation for the reaction of KMnO_4 solution a
When you calculated k in the rate equation for the reaction of KMnO_4 solution and H_2C_2O_4 solution, you assumed k had the same value under the conditions of determinations 1, 2…
When you calculated k in the rate equation for the reaction of KMnO_4 solution a
When you calculated k in the rate equation for the reaction of KMnO_4 solution and H_2C_2O_4 solution, you assumed k had the same value under the conditions of determinations 1, 2…
When you cook rice, you hydrolyse the cellulose in the rice to starch via the fo
When you cook rice, you hydrolyse the cellulose in the rice to starch via the following chemical reaction: Cellulose + H20 Starch Brown rice takes twice as long to cook as white r…
When you did the 9 Bottles experiment in General Chemistry 1, explain why you di
When you did the 9 Bottles experiment in General Chemistry 1, explain why you did not observe a precipitate when you mixed equal volumes of 0.01 M BaCl_2 is mixed with 0.1 M Pb (N…
When you finished extracting your natural product, you had used a total of 10 mL
When you finished extracting your natural product, you had used a total of 10 mL of 50:50 acetone/hexane. After your first wash with 5 mL saturated, aqueous sodium chloride soluti…
When you finished extracting your natural product, you had used a total of 10 mL
When you finished extracting your natural product, you had used a total of 10 mL of 50:50 acetone/hexane. After your first wash with 5 mL saturated, aqueous sodium chloride soluti…
When you have a password stored in a database that has been strongly hashed and
When you have a password stored in a database that has been strongly hashed and salted does it really matter if the underlying user password is weak? If you setup features like li…
When you have been \"hacked\" and you accept to pay for decrypting your encrypte
When you have been "hacked" and you accept to pay for decrypting your encrypted files, how the attacker do the job ? I understood that a symmetric key is used, itself encrypted by…
When you have selected your answer to each question, black pencil. Make a heavy,
When you have selected your answer to each question, black pencil. Make a heavy, full mark, but no stray marks. If you There is only one correct answer to each question. Any quest…
When you have selected your answer to each question, blacken the corresponding s
When you have selected your answer to each question, blacken the corresponding space on the answer sheet using a soft #2 pencil. Make a heavy, full mark, but no stray marks. If yo…
When you have selected your answer to each question, blacken the corresponding s
When you have selected your answer to each question, blacken the corresponding space on the answer sheet using a soft, #2 pencil. Make a heavy, full mark, but no stray marks. If y…
When you have to iterate a reader where the number of items to read is unknown,
When you have to iterate a reader where the number of items to read is unknown, and the only way to do is it to keep reading until you hit the end. This is often the place you nee…
When you make an connection with a proxy and you do something shifty to a server
When you make an connection with a proxy and you do something shifty to a server, the people working the server could just call up all ISP's and then your ISP sees the last connec…
When you make up 500 ml of acetate buffer, which of the following best describes
When you make up 500 ml of acetate buffer, which of the following best describes the steps you will take Selected Use the Henderson-Hasselbalch equation to work out the ration of …
When you measure a volume of a liquid using a graduated cylinder, read the top p
When you measure a volume of a liquid using a graduated cylinder, read the top position of the meniscus of a liquid to determine the volume. Extra chemicals you sampled should be …
When you measureout a volume of liquid using a volumetric pipet, you should 1-Em
When you measureout a volume of liquid using a volumetric pipet, you should 1-Empty the liquid into the receiving flask. Any liquid remainingin the pipet stays there. 2-Em…
When you need to produce a variety of diluted solutions of a solute, you can dil
When you need to produce a variety of diluted solutions of a solute, you can dilute a series of stock solutions. A stock solution has a significantly higher concentration of the g…
When you open a bottle of beer, you can fleetingly see a bit of vapor in the ope
When you open a bottle of beer, you can fleetingly see a bit of vapor in the opening. Here you are to analyses what happens. The gas in the bottle consists mainly of CO_2, with a …
When you performed a two-step dilution of the product for TLC, you weighed out o
When you performed a two-step dilution of the product for TLC, you weighed out o.o5g of the product and 1.5 CH_2Cl_2. You then took 0.1 mL of the solution in a new test tube, and …
When you put water in a freezer, solid ice is formed. How is this change differe
When you put water in a freezer, solid ice is formed. How is this change different from the precipitation reactions in this experiment that also form solids? How should each of th…
When you put water in a freezer, solid ice is formed. How is this change differe
When you put water in a freezer, solid ice is formed. How is this change different from the precipitation reactions in this experiment that also form solids? How should each of th…
When you receive an email containing pictures from a new domain in Outlook you c
When you receive an email containing pictures from a new domain in Outlook you can right-click on the address and "Mark this domain as trusted" which will autoload all the photos …
When you step out of a shower, the tempurature in the bathrrom is 71 degrees F,
When you step out of a shower, the tempurature in the bathrrom is 71 degrees F, and the relative humidity is 96%. You notice that a barely perceptable amount of water has condense…
When you swim underwater, the pressure of the water ushes against your chest cav
When you swim underwater, the pressure of the water ushes against your chest cavity and subsequently reduces the size of your lungs. For every 10 m below the water surface, the pr…
When you think of a career in chemistry, you may visualize an older man with gre
When you think of a career in chemistry, you may visualize an older man with grey hair mixing chemicals in a laboratory with a lot of explosions. However, in today’s society there…
When you titrate 17.2 mL of a 0.14 M solution of (CH 3 ) 3 N (trimethylamine), i
When you titrate 17.2 mL of a 0.14 M solution of (CH3)3N (trimethylamine), it required 17.0 mL of hydrochloric acid solution. Assuming that you have reached the equivalence point,…
When you titrate a solution that contains CaCO_3 obtained by dissolving part of
When you titrate a solution that contains CaCO_3 obtained by dissolving part of an antacid tablet, you want to optimize the accuracy of the buret by dissolving a mass that will co…
When you use VPN, what happens if the VPN server goes offline? Would Windows sil
When you use VPN, what happens if the VPN server goes offline? Would Windows silently revert to using your LAN connection, without notifying you? This would be an OK behavior if y…
When you\'re in Python or Javascript, you should always put binary operators at
When you're in Python or Javascript, you should always put binary operators at the end of the previous line, in order to prevent newlines from terminating your code prematurely; i…
Whena saturate solution of LiCl was chilled someof the solid solute formed LiCl
Whena saturate solution of LiCl was chilled someof the solid solute formed LiCl (s)---- Li + (aq) + Cl - (aq) a) The stress placed on the system was ( an increase/ a decrease) int…
Whenever I am defining my own events, I use a pattern such as the following (whi
Whenever I am defining my own events, I use a pattern such as the following (which I believe is how the MSDN recommends doing it): public class MyEventClass { private bool _va…
Whenever I want to add a new functionality, I introduce a new private variable i
Whenever I want to add a new functionality, I introduce a new private variable into the class. Declare it just above the first method definition. leave a small comment. Set it in …
Whenever a ciphertext is decrypted using a block-cypher, we need to remove the p
Whenever a ciphertext is decrypted using a block-cypher, we need to remove the padding. There are different ways to add padding, but they usually set the last byte of the last blo…
Whenever a gas is in contact with water, some of the water vaporizes into the ga
Whenever a gas is in contact with water, some of the water vaporizes into the gas. The water vapor that mixes with the gas contributes a pressure called the vapor pressure. The va…
Whenever we form compound from its constituting ions the species are cross multi
Whenever we form compound from its constituting ions the species are cross multiplied with the number equal to the valency of the other ions.For example in Cr^+3 and OH^-, OH^- wi…
Whenever we implement a frontend framework in the likes of Backbone, AngularJS e
Whenever we implement a frontend framework in the likes of Backbone, AngularJS etc. there's an integration process involved with the backend technologies like NodeJS, Rails, Yii e…
Whenever you introduce a liquid in an evacuated container (say you introduce 1.0
Whenever you introduce a liquid in an evacuated container (say you introduce 1.00 g), some of the liquid instantaneously vaporizes leaving you with a smaller volume of liquid. To …
Where Ccal= heat capacity of calorimeter delta t = change in temperature Practic
Where Ccal= heat capacity of calorimeter delta t = change in temperature Practice Exercise 6.7: A quantity of 1.435g of naphthalene C10H8, a pungent-smelling used in moth repellan…
Where I am in the US, health care providers refuse to send anything through emai
Where I am in the US, health care providers refuse to send anything through email (e.g. even something as trivial as an appointment reminder). Often they claim that email is not s…
Where I work we have our own system library, which pretty much is only wrappers
Where I work we have our own system library, which pretty much is only wrappers around the STL, such as: template <typename T> class HVector { protected: std::vector<…
Where I work we have over a dozen internal SW systems that we have developed in-
Where I work we have over a dozen internal SW systems that we have developed in-house using a variety of technologies, frameworks, and languages. Those include various from Micros…
Where R is the gas constant (8.314 J deg^-1mol^-1), T is the absolute temperatur
Where R is the gas constant (8.314 J deg^-1mol^-1), T is the absolute temperature (37 degree C = 310 degree K). F is the Faraday's constant (96500 C mol^-1); z is the valence for …
Where applicable all but which of the following procedures may reduce corrosion?
Where applicable all but which of the following procedures may reduce corrosion? Avoidance of fineable contacts Sacrificial Anodes Narration of feed water voltages A design eighte…
Where applicable, you MUST show ALL work for full credit!!! 1. Calculate the vap
Where applicable, you MUST show ALL work for full credit!!! 1. Calculate the vapor pressure of a solution prepared by mixing 35.0 grams of solid Na2SO with 375.0 grams of water at…
Where applicable, you MUST show ALL work for full credit!!! 1. Calculate the vap
Where applicable, you MUST show ALL work for full credit!!! 1. Calculate the vapor pressure of a solution prepared by mixing 35.0 grams of solid Na2SO with 375.0 grams of water at…
Where are they getting 14 from? he most common base NaO and KOH. Oher strong bas
Where are they getting 14 from? he most common base NaO and KOH. Oher strong bases include h metals, such as Ca(OH)2. SrO)2. and Ba -T s are the hydroxide compounds of the alkali …
Where did the 0.40 and 0.60 come from? Please show work!! QS: Use activity coeff
Where did the 0.40 and 0.60 come from? Please show work!! QS: Use activity coefficients to calculate the pH after 10.0 mL of 0.100 M trimethylammonium bromide was titrated with 4.…
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