Chemistry concepts and calculations

13# A 29.3 g of a new element was isolated from 660 kg of the ore molybdenite. T

13# A 29.3 g of a new element was isolated from 660 kg of the ore molybdenite. The percent by mass of this element in the ore molybdenite was: A) 44% B)6.6% C)29.3% D) 0.0044% E)1…

13% 8:08 PM docs.google.com Covalent Bonding and lonic Bonding study guide T-Mob

13% 8:08 PM docs.google.com Covalent Bonding and lonic Bonding study guide T-Mobile LTE Note compare and contrast does not mean state one similarity and one difference Go back to …

13) (10 points) Camphor has the structure and physical properties given below: m

13) (10 points) Camphor has the structure and physical properties given below: mp: 175-177 °C bp: 209 °C sublimes readily Camphor's physical properties are unusual when compared t…

13) A reactant that accepts an electron is a/an a) Reducing agent b) Proton dono

13) A reactant that accepts an electron is a/an a) Reducing agent b) Proton donor c) Oxidizing agent d) Electron donor e) Oxygen containing molecule 14) The environment in which a…

13) A student is trying to prepare 350mL of 0.25M NaClI from a stock solution of

13) A student is trying to prepare 350mL of 0.25M NaClI from a stock solution of 2.50M NaCI. He takes 35mL of 2.50M NaCl and adds 350mL of water to it. What did he do wrong? 14) A…

13) A team of biochemists has been hired by the Olympic Committee of a highly co

13) A team of biochemists has been hired by the Olympic Committee of a highly competitive country to devise a strategy aimed at producing the best long-distance runners and cyclis…

13) Cadmium was once used in rechargeable batteries, but has largely been discon

13) Cadmium was once used in rechargeable batteries, but has largely been discontinued due to its toxicity. Ethylenediamine (en), NH2C2H&NH2;, is a strong ligand that reacts w…

13) Calculate the pH: a) 25.00 mL of 0.17 M ethylamine is titrated with 0.20 M h

13) Calculate the pH: a) 25.00 mL of 0.17 M ethylamine is titrated with 0.20 M hydrochloric acid. When 13.55 mL of the acid have been added what should the approximate pH be? b) I…

13) Calculate the poll of a solution that contains 2.4 × 10-5 M H30, A) 2.40 B)

13) Calculate the poll of a solution that contains 2.4 × 10-5 M H30, A) 2.40 B) 9.38 C) 4.62 D) 11.60 E) 4.17 at 25°C 14) Determine the [H30 ] in a 0.265 M HCO solution. The Ka of…

13) Determine the rate law and the value of k for the following reaction using t

13) Determine the rate law and the value of k for the following reaction using the data provided. 2NO(g) + O2(g)-2NO2(g) [Noli (M) [O2li (M) Initial Rate (Mpls-1) 0.030 0.0055 8.5…

13) If a 50.0 mL sample of xenon gas is at 0.921 atm and 27 \'C, what is the vol

13) If a 50.0 mL sample of xenon gas is at 0.921 atm and 27 'C, what is the volume of the gas at STP? A) 41.9 mL B) 49.4 mL G) 50.6 mL D) 54.9 mL E) 59.7 mL Section: 10.7 Combined…

13) Part A Write an equation for the formation of NO2(g) from its elements in it

13) Part A Write an equation for the formation of NO2(g) from its elements in its standard states. Express your answer as a chemical equation. Identify all of the phases in your a…

13) Ten glass beads are lined up end to end along a ruler. The total length of t

13) Ten glass beads are lined up end to end along a ruler. The total length of the glass beads is 13.2 cm. What is the end along volume of 1 glass bead in cm3? A) 77.1 B) 9.63 C) …

13) The reaction below shows the oxidation of sulfur dioxide to form sulfur trio

13) The reaction below shows the oxidation of sulfur dioxide to form sulfur trioxide. 2 SO, + O, 2 SO3(g) aH @sc=-197.6 kJ In the laboratory, SO2 and O2 gases are placed inside a …

13) The statement, \"In a chemical reaction, matter is neither created nor destr

13) The statement, "In a chemical reaction, matter is neither created nor destroyed" is called A) the Law of Conservation of Mass B) Dalton's Atomic Theory C) the Scientific Metho…

13) Use the activity series to predict which of the following reactions will occ

13) Use the activity series to predict which of the following reactions will occur. Complete and balance the equations. If no reactions occurs, write “no reaction” as the product.…

13) What is the Kw of pure water at 50.0°C, if the pH is 6630? 13) A) 5.50 × 10-

13) What is the Kw of pure water at 50.0°C, if the pH is 6630? 13) A) 5.50 × 10-14 B) 2.13 x 10-14 C) 1.00% 10-14 D) 2.34 x 10-7 E) There is not enough information to calculate th…

13) When ethylene glycol, HOCH2CH20H, is added to the water in an automobile rad

13) When ethylene glycol, HOCH2CH20H, is added to the water in an automobile radiator, the 13) effect is to A) raise the boiling point and raise the freezing point B) raise the bo…

13) Which of the following bearings can take thrust loads? a. bushings b. roller

13) Which of the following bearings can take thrust loads? a. bushings b. roller bearings c. rod and bearings d. single row ball bearings e. angular contact ball bearings f. spher…

13) Which of the following is not found in glycolipids? Question 13 options: a c

13) Which of the following is not found in glycolipids? Question 13 options: a carbohydrate an amide linkage a hydroxyl group a phosphate group 16) Which of the following is true …

13) Which of the following statements is incorrect? 13) A) The solubility produc

13) Which of the following statements is incorrect? 13) A) The solubility product constant is the productof the concentrations of the ions involved in a solubility equilibrium B) …

13) Which one of the following substances is more likely to dissolve in benzene

13) Which one of the following substances is more likely to dissolve in benzene (C6H6)? A) HBr B) NaCI C) CCl4 D) CH3CH20H E) NH3 gas liquid and gas solid and liquid -solid Heat a…

13) Which one of the following substances is more likely to dissolve in benzene

13) Which one of the following substances is more likely to dissolve in benzene (C6H6)? A) HBr B) NaCI C) CCl4 D) CH3CH20H E) NH3 gas liquid and gas solid and liquid -solid Heat a…

13) a 0.10 HF solution is 8.4% ionized. Calculate the H+ ion concentration. Some

13) a 0.10 HF solution is 8.4% ionized. Calculate the H+ ion concentration. Someone solve this by working it out for me please, I have no clue where to even start. One more questi…

13,14,15,16 please explain answer lution in the cell 13. The salt bridge found i

13,14,15,16 please explain answer lution in the cell 13. The salt bridge found in many electrochemical cells is needed to A. transfer ions from one half cell to the other B. carry…

13,6. PLEASE ANSWER CORRECTLY. I HAVE POSTED THIS QUESTION 3 TIMES AND GOT WRONG

13,6. PLEASE ANSWER CORRECTLY. I HAVE POSTED THIS QUESTION 3 TIMES AND GOT WRONG ANSWERS. WILL LEAVE FEEDBACK. Aluminum metal and bromine liquid (red) react violently to make alum…

13-10. Hg 2+ can be measured in the presence of many other metal ions by selecti

13-10. Hg 2+ can be measured in the presence of many other metal ions by selective masking with I-7. A 100- mL unknown solution containing Hg2+ , Ca2+ , Al3+, Mg2+, Co2+ , Ni2+, C…

13-16 Autility in south Florida has converted its plant to sodium hypochlo- rite

13-16 Autility in south Florida has converted its plant to sodium hypochlo- rite because of community complaints about the safety of using chlorine gas. The hypochlorite is delive…

13-20 D) Phosphoric aid. Ka-7.3xo Which cone of these salts will f a fesie solut

13-20 D) Phosphoric aid. Ka-7.3xo Which cone of these salts will f a fesie solution upon dissolving in water? Ct s Which one of the following salis will form an acidic solution on…

13-20 a. 13. Monsoons are caused by: the Coriolis Effect c. Earth\'s rotational

13-20 a. 13. Monsoons are caused by: the Coriolis Effect c. Earth's rotational tilt b. the different specific heats of land and water d. seasonal variations in the height of the t…

13-20 please a, 13. Monsoons are caused by: the Coriolis Effect c. Earth\'s rota

13-20 please a, 13. Monsoons are caused by: the Coriolis Effect c. Earth's rotational tilt b, the different specific heats of land and water d. seasonal variations in the height o…

13. (a) When 1.00 L sample of water from the surface of the Dead sea is evaporat

13. (a) When 1.00 L sample of water from the surface of the Dead sea is evaporated, 179 g of MgCl2 is recovered. What was the molarity of MgCl2 in the water sample? (b) If the den…

13. 0/4 points| Previous Answers My Notes Ask Your Teacher Calculate AHon for ea

13. 0/4 points| Previous Answers My Notes Ask Your Teacher Calculate AHon for each of the following using data from Appendix B. (a) C2H6(g) + O2(g) CO2(g) + H2O(g) [unbalanced] Yo…

13. 15.0g of water at 60.0°C is mixed with 45.0g of water at 40.0°C. What will b

13. 15.0g of water at 60.0°C is mixed with 45.0g of water at 40.0°C. What will be the final temperature if no heat is lost to the surroundings? Use the reaction and the Al for the…

13. 2.s4 points I Previous Answers My Notes Ask Your I.) Find the energy (and wa

13. 2.s4 points I Previous Answers My Notes Ask Your I.) Find the energy (and wavelength) of the photon required to excite a hydrogen atom from the n 7 state to the a.) n 11 state…

13. 3/4 points | Previous Arswers My Notes AskYour Nitric oxide and bromine at i

13. 3/4 points | Previous Arswers My Notes AskYour Nitric oxide and bromine at intial pressures is as follows. of 98.4 and 41.3 tor, respectively, were allowed to react at 300K. A…

13. 3/4 points | Previous Arswers My Notes AskYour Nitric oxide and bromine at i

13. 3/4 points | Previous Arswers My Notes AskYour Nitric oxide and bromine at intial pressures is as follows. of 98.4 and 41.3 tor, respectively, were allowed to react at 300K. A…

13. 91 g of sodium nitrate is dissolved in 100 g of water at 8. 80Cand constant

13. 91 g of sodium nitrate is dissolved in 100 g of water at 8. 80Cand constant pressure. The enthalpy of dissolving is Hrxn = +?24.5 kJ/mol. How manygrams of ice will be formed a…

13. A sample of an ideal gas has a volume of 0.500 L at 25 degrees Celsius and 1

13. A sample of an ideal gas has a volume of 0.500 L at 25 degrees Celsius and 1.20 atm pressure. What is its volume at 75 degrees Celsuys and 3.60 atm? 14. In a mixture of N2 and…

13. A sample of solid Ca(OH) 2 was stirred in water at a certain temperature unt

13. A sample of solid Ca(OH)2 was stirred in water at a certain temperature until the solution contained as much dissolved Ca(OH)2 as it could hold. A90.8-mL sample of this soluti…

13. A single extraction with 100 mL of CHCl3 extracts or removes 88.5% of the we

13. A single extraction with 100 mL of CHCl3 extracts or removes 88.5% of the weak acid, HA, from 50 mL of aqueous solution. What is the partition coefficient, K, for HA at a pH 3…

13. A student carries out an experiment to standardize (determine the exact conc

13. A student carries out an experiment to standardize (determine the exact concentration) of a sodium hydroxide solution. To do this, the student weighs out a 1.3009 sample of po…

13. A thermodynamically controlled reaction will yield predominantly a. the most

13. A thermodynamically controlled reaction will yield predominantly a. the most stable product b. the product whose formation requires the smallest free energy of activation c. t…

13. According to the following cell notation, which species is undergoing oxidat

13. According to the following cell notation, which species is undergoing oxidation? Zn | Zn (aq) 11 Mn2 (aq)I Mno(s) | Pt(s) a. Mn2 (aq) b. Zn2(ag) c. Mno2(s d. Zn(s) e. Pt(s) 14…

13. An and oxygen atoms. nalze th oloing data for a 5.530 g sample ofa compound

13. An and oxygen atoms. nalze th oloing data for a 5.530 g sample ofa compound that contains only carbon, hydrogen alyze the following data for a 5.530 g sample of a compound tha…

13. Balance the following equation for a reaction that occurs in basic medium in

13. Balance the following equation for a reaction that occurs in basic medium in a nickel-cadmium alkaline battery. H2O + Cd + Ni2O3 --> Cd(OH)2 + Ni(OH)2 14. Balance the follo…

13. Below are four representations of stereoisomers of ephedrine a sympathomimet

13. Below are four representations of stereoisomers of ephedrine a sympathomimetic amine commonly used as a stimulant, appetite suppressant, concentration aid, and decongestant. I…

13. Below is the analysis of a natural water. Species Concentration (ppm) Na+ 15

13. Below is the analysis of a natural water. Species Concentration (ppm) Na+ 150. K+ 10.0 Ca2+ 32.0 Mg2+ 27.0 SO4 2- 280 Sr2+ 0.400 Cl- 15.0 HCO3 - 150. SiO2(aq) 19.0 pH 7.40 (a)…

13. Calculate the frequency of visible light having a Wavelength of 464.1 nm 14.

13. Calculate the frequency of visible light having a Wavelength of 464.1 nm 14. A police radar unit is operating on a frequency of 9.527 gigahertz. What is the wavelength of the …

13. Calculate the standard enthalpy of hydrogenation of cyclohexene to cyclohexa

13. Calculate the standard enthalpy of hydrogenation of cyclohexene to cyclohexane given that of combustion of both these compounds are -3752 kWmole for -3953 kJ/mole for cyclohex…