Chemistry concepts and calculations
117302 questions • Page 147 / 2347
1. The two compounds below were targeted for synthesis to further test the conce
1. The two compounds below were targeted for synthesis to further test the concept of aromaticity. What do you expect them to be? (hint: first decide how many lone pairs are on ea…
1. The two possible values for a relational expression are ____________________
1. The two possible values for a relational expression are ____________________ ?and________________________ ? . 2. C++ uses the _______________________symbol to represent the AND…
1. The two starting materials 1 and 2 are essentially equimolar. (Confirm this a
1. The two starting materials 1 and 2 are essentially equimolar. (Confirm this and show your work). How many molar equivalents of each of the following reagents is being used? (a)…
1. The use of microscale techniques does not change the hazardous nature of the
1. The use of microscale techniques does not change the hazardous nature of the reagents we use. Briefly describe the hazards associated with even small amounts of each of the fol…
1. The value of Keq for the following reaction is 5.0 x 10-9 BaCO3(s) Ba+2(
1. The value of Keq for the following reaction is 5.0 x 10-9 BaCO3(s) <--> Ba+2(aq) + CO32-(aq) What statement is most correct about the equilibrium reaction mixture? produc…
1. The value of delta G at 25 degrees C for the following reaction, C2H4(g)+H2(g
1. The value of delta G at 25 degrees C for the following reaction, C2H4(g)+H2(g)-->C2H6(g), is _________kJ/mol. At 298K, delta H for this reaction is -137.5 kJ/mol, and delta …
1. The van\'t Hoff factor increases with increasing solute concentration true or
1. The van't Hoff factor increases with increasing solute concentration true or false 2. If a reaction rate doubles when the concentration of reactants double the rate a) zeroth o…
1. The vapor pressure of ethanol (C2H5OH) at 20°C is 44 mmHg, and the vapor pres
1. The vapor pressure of ethanol (C2H5OH) at 20°C is 44 mmHg, and the vapor pressure of methanol (CH3OH) at the same temperature is 94 mmHg. A mixture of 28.1 g of methanol and 45…
1. The vapor pressure of liquid chloroform , CHCl 3 , is 100 . mm Hg at 283 K. A
1. The vapor pressure of liquid chloroform, CHCl3, is 100. mm Hg at 283 K. A 0.384 g sample of liquidCHCl3 is placed in a closed, evacuated 400. mL container at a temperature of 2…
1. The vapor pressure of methanol (CH3OH) at 295 K is 14.40 kPa. What is this pr
1. The vapor pressure of methanol (CH3OH) at 295 K is 14.40 kPa. What is this pressure in atmospheres? 2. Compressed gas cylinders used in chemistry labs can handle gas pressure u…
1. The volatile organic compound geraniol, a component of oil of roses, is used
1. The volatile organic compound geraniol, a component of oil of roses, is used in perfumery. The density of the vapor at 533K and 0.136 atm is 0.480 g/L. What is the molar mass o…
1. The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2
1. The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2 (aq, 0.100 M)||Zn2 (aq, ? M)|Zn(s) is 24.0 mV at 25 C. Calculate the concentration of the Zn2 (aq) …
1. The volume of a gas in a flexible container is 1.25 L at 5°C. What is the vol
1. The volume of a gas in a flexible container is 1.25 L at 5°C. What is the volume of the gas when it is heated to 75°C? Assume the pressure of the gas remains constant throughou…
1. The volume of a sample of hydrogen gas was decreased from 11.03 L to 4.32 L a
1. The volume of a sample of hydrogen gas was decreased from 11.03 L to 4.32 L at constant temperature. If the final pressure exerted by the hydrogen gas sample was 8.41 atm, what…
1. The warm weather climates necessary for citrus orchards (like peaches) genera
1. The warm weather climates necessary for citrus orchards (like peaches) generally minimize the risk of frost conditions. Nevertheless, occasionally measures are needed to protec…
1. The warm weather climates necessary for citrus orchards (like peaches) genera
1. The warm weather climates necessary for citrus orchards (like peaches) generally minimize the risk of frost conditions. Nevertheless, occasionally measures are needed to protec…
1. The work-function of rubidium metal is 208 kJ/mol, which means that it takes
1. The work-function of rubidium metal is 208 kJ/mol, which means that it takes 208 kJ to remove 1 mol of electrons from the surface of solid rubidium metal. a) What is the maximu…
1. The work-up procedure calls for washing the crude 2-chloro-2-methylbutane wit
1. The work-up procedure calls for washing the crude 2-chloro-2-methylbutane with cold sodium bicarbonate solution. a. What purpose does this wash serve? b. This washing procedure…
1. The “Zebra” cell was invented in 1985 in South Africa as part of the “ZEolite
1. The “Zebra” cell was invented in 1985 in South Africa as part of the “ZEolite Battery Research Africa” project, and is used in all-electric municipal buses and other vehicles. …
1. The______ model gave us the existence and location of the nucleus. 2. The ene
1. The______ model gave us the existence and location of the nucleus. 2. The energy of the reactants is higher than the energy of the products in an reaction. 3. Oxygen typically …
1. Theoceans a. The annual input of SO4 2- into theoceans by rivers is estimated
1. Theoceans a.The annual input of SO42-into theoceans by rivers is estimated to be 3 x 1012 mole/yr. If SO42- were at a steady-stateconcentration in sea water and the only signif…
1. There are many similarities between the analytical techniques of gas chromato
1. There are many similarities between the analytical techniques of gas chromatography (GC) and HPLC. a. Write down the van Deemter Equation and explain the significance of each o…
1. There are many web sites with third party plug-ins and scripts. However, prog
1. There are many web sites with third party plug-ins and scripts. However, programmers do not always know if they are safe. OWASP Top Ten is a project to identify web application…
1. There aren’t many Organic reactions that produce color changes, but the reage
1. There aren’t many Organic reactions that produce color changes, but the reagents used in this lab are used for many quick identifications. Benedict’s Reagent can also be used t…
1. There is a well-insulated box, if we fill with 100kg water at 50 \'C and then
1. There is a well-insulated box, if we fill with 100kg water at 50 'C and then put a 50 kg carbon steel ball at 75 C into the box. Hint: Cp, carbon steel- 0.12 (kcal/(kg*K)) (a) …
1. There is nothing like the smell of BBQ in the summertime. Many people use pro
1. There is nothing like the smell of BBQ in the summertime. Many people use propane gas Barbeques to cook the perfect steak. Here is the reaction that is occurring while the stea…
1. Thermite is a metal powder mixture used frequently in pyrotechnics and metal
1. Thermite is a metal powder mixture used frequently in pyrotechnics and metal construction work. It is composed of highly powderized aluminum and iron(III) oxide and when ignite…
1. This activity investigates the production of glucose on a small scale. The fo
1. This activity investigates the production of glucose on a small scale. The following analysis demonstrates what it would take to scale up the operation a. The test stripes meas…
1. This course places special emphasis upon the methodologies and technologies t
1. This course places special emphasis upon the methodologies and technologies that you will need to use in the near future. These include: parallel (multi-core) and GPU processin…
1. This is Spinal Tap falls into the mode of a. ordinarx fictional realism b doc
1. This is Spinal Tap falls into the mode of a. ordinarx fictional realism b documentary realisnm c. historical realism d. mockumentary 2. Which is not an element of ordinary fict…
1. This is a reaction mechanism for an enzyme that converts carbamoyl phosphate
1. This is a reaction mechanism for an enzyme that converts carbamoyl phosphate (on the far left) and aspartate (you know that one!) to carbamoylaspartate (on the right) plus inor…
1. This magnesium cube has a mass of 8.0 ounces. The density of magnesium is 1.7
1. This magnesium cube has a mass of 8.0 ounces. The density of magnesium is 1.74 g/cm3 Calculate the length of a side of the cube in inches. (Hint!: 2.54 cm 1 in and 1 ounce 28.3…
1. This problem is intended to show the structure of the partition function for
1. This problem is intended to show the structure of the partition function for a system consisting of weakly interacting distinguishable particles. It starts with an example. Con…
1. This problem is intended to show the structure of the partition function for
1. This problem is intended to show the structure of the partition function for a system consisting of weakljy interacting distinguishable particles. It starts with an example. Co…
1. This problem is intended to show the structure of the partition function for
1. This problem is intended to show the structure of the partition function for a system consisting of weakly interacting distinguishable particles. It starts with an example. Con…
1. This problem is intended to show the structure of the partition function for
1. This problem is intended to show the structure of the partition function for a system consisting of weakljy interacting distinguishable particles. It starts with an example. Co…
1. This question explores the following phenomenon - when you shake a carbonated
1. This question explores the following phenomenon - when you shake a carbonated beverage before it is opened it often explodes. (Your own experimental results allowed). a) Does t…
1. This question has multiple parts. Work all the parts to get the most points.
1. This question has multiple parts. Work all the parts to get the most points. a Classify each of the following solutions as saturated, unsaturated, or supersaturated based on th…
1. Three drops of concentrated sulfuric acid are added to the reaction mixture a
1. Three drops of concentrated sulfuric acid are added to the reaction mixture at the beginning of this reaction. What is the role of this compound in the reaction? 2. Addition of…
1. Three elements have the electron configurations 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1
1. Three elements have the electron configurations 1s22s22p63s23p64s1, 1s22s22p63s23p5, and 1s22s22p63s1. The first ionization energies of these elements (not in the same order) a…
1. Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown a
1. Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, and an unknown amount of propane, C3H8) were added to the same 10.0-L container. At 23.0 ?C, the total pressure in …
1. Three of these code blocks result in a syntax error. Three of these code bloc
1. Three of these code blocks result in a syntax error. Three of these code blocks are quite illegal. One of these code blocks is legal unlike the others. Now it's time to play ou…
1. Three runs were used to study the reaction: A+B ---> 3C +D The following data
1. Three runs were used to study the reaction: A+B ---> 3C +D The following data were obtained (initial concentrations of C and D= 0) InitialConcs(M) …
1. Three solutions have the following pH values: solution (a), pH 6.0; solution
1. Three solutions have the following pH values: solution (a), pH 6.0; solution (b), pH 1.8; solution (c), pH 7.9. Which solution contains the highest H3O+ ion concentration? 2. T…
1. Three solutions have the following pH values: solution (a), pH 6.0; solution
1. Three solutions have the following pH values: solution (a), pH 6.0; solution (b), pH 1.8; solution (c), pH 7.9. Which solution contains the highest H3O+ ion concentration? 2. T…
1. Through the formation of a chemical bond between two hydrogen atoms, which of
1. Through the formation of a chemical bond between two hydrogen atoms, which of the following statements is always true? A.One of the hydrogen atoms is ionized. B.Energy is relea…
1. Titanium occurs in the magnetic mineral ilmenite (FeTiO3), which is often fou
1. Titanium occurs in the magnetic mineral ilmenite (FeTiO3), which is often found mixed up with sand. The ilmenite can be separated from the sand with magnets. The titanium can t…
1. Titanium reacts with iodine to form titanium(III) iodide, emitting heat. 2Ti(
1. Titanium reacts with iodine to form titanium(III) iodide, emitting heat. 2Ti(s)+3I2(g)2TiI3(s)Horxn = -839 kJ partA)Determine the masses of titanium and iodine that react if 1.…
1. Titration curve for the reaction of 0.05M H3PO4 with 0.10M NaOH. 1st equivale
1. Titration curve for the reaction of 0.05M H3PO4 with 0.10M NaOH. 1st equivalence point: (10.0, 5.0) buffer region 6.5 2nd equivalence point: (20.0, 10.0) buffer region 15.0 a)…
1. Titration of 331 mL of 0.501 M carbonic acid (H 2 CO 3 ) (K a1 = 4.3 x 10 -7
1. Titration of 331 mL of 0.501 M carbonic acid (H2CO3) (Ka1 = 4.3 x 10-7, Ka2 = 5.6 x 10-11) with 1.5 M KOH. b) What will the pH of the solution be when 0.1913 L of 1.5 M KOH are…
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