General Questions and Answers

6 Give the full electron configuration of the following atoms a Sc b Cl c Ca

An order is given to administer methylprednisolone an anti inflammatory drug by IV at a rate of 36 mg every 30 min The V bag contains 125 mg of methylprednisolone in every 2 0 mL What should the flow rate be in milliliters per minute mL min flow rate mL min

Structure Refinement Molecular replacement calculations or other calculations to Manually build model of protein structure Protein Purification Steps

An experimental plot of In Pvap vs 1 T is obtained in lab for an unknown liquid The slope of the best fit line for the graph is 4775 K What is the enthalpy of vaporization for the liquid in kJ mol

9 How many milliliters of 0 50 M potassium dichromate solution must be diluted in order to prepare 250 mL of 0 10 M solution 10 How many grams of ammonium sulfate NH4 SO4 are needed to make 0 25 L of a solution at a concentration of 6 M 132 145 198 299 0 24 broer WX 1 bata 11 If I dilute 250 mL of a 0 10 M lithium acetate solution to a volume of 750 mL what will the concentration of this solution be 250 0 10 750 750 12 How many mL of 9 0 M sodium phosphate solution are required to obtain 0 050 moles of sodium phosphate 6 31x1 2m 8 04 mol TX 0 033M 13 How many grams of copper II fluoride CuF2 are needed to make 6 7 liters of a 1 2 M solution 0 17mal o fl 101 543 Ihol 14 If I have 340 mL of a 0 5 M NaBr solution what will the concentration be if I add 560 mL more water to it 0 7470562 0 94 0 34 0 17 hal 20 11n0 2 0 19M 15 If I leave 750 mL of 0 50 M sodium chloride solution uncovered on a windowsill and 150 mL of the solvent evaporates what will the new concentration of the sodium chloride be 750 L 0 50m beo x 0 625M 600

You want to make a 2L of a phosphate buffer at pH of 11 20 with a buffer capacity of 1 0 M How many mL of 0 1M NaOH is required to exceed the buffer acid phosphoric acid 1 41 mL Onone of these 1410 mL 705 mL formula H3PO4 0 705 mL Kat 7 5 x 10 3 Kaz 6 2 x 10 8 Ka3 4 8 x 10 13

Determine OH in 0 25 M Sr OH 2 aq A OH 0 25 M B OH 0 25 M C OH 0 50 M OH 0 50 M D OD OA B OC

Consider the two coordination complexes CoF and Co en 3 In aqueous solution one of these complexes appears orange and the other appears green Which complex is which color

ssignment Submission Scoring Assignment Submission For this assignment you submit answers by question parts The number of submissions remaining for each ques Assignment Scoring Your best submission for each question part is used for your score 1 1 Points DETAILS AUFINTERALG9 10 5 018

What is the molarity of ions in a 0 847 M solution of MgSO4 assuming the compound dissociates completely

What are the coefficients for the chemical equation below once balanced CH3CH CH OH 1 O g CO g H O l A 1 5 3 4 B 2 9 6 7 C 2 9 6 8 D 2 11 6 8

The generic metal A forms an insoluble salt AB s and a complex AC5 aq The equilibrium concentrations in a solution of ACs were found to be A 0 100 M C 0 0360 M and ACs 0 100 M Determine the formation constant K of ACs Kf The solubility of AB s in a 1 000 M solution of C aq is found to be 0 178 M What is the Ksp of AB Ksp

5 Give the chemical formula for the following compounds or di a lithium sulfite b ammonium phosphate c calcium carbonate d aluminum dichromate

Identify each of the following as being a purine or a pyrimidine and name them Part C H NH Part D Opurine N Submit pyrimidine Request Answer

explanation which shows how pH pH 14 is derived using Kw H3O OH 1 0 10 14 log H3O OH log 1 0 10 14 A log H3O log OH 14 0 log H3O log OH 14 0 pH pOH 14 0 B H3O OH 1 0 10 4 log H3O OH log 1 0 10 4 log H3O log OH 14 0 pH pOH 14 0 D H3O OH 1 0 10 4 log H3O OH log 1 0 10 4 X C log H 0 log OH 14 0 log H3O log OH 14 0 pH pOH 14 0 H3O OH 1 0 10 14 log H3O OH log 1 0 10 14 log H3O log OH 14 0 log H3O log OH 14 0 pH pOH 14 0

1 Cu NO3 2 aq 2NaOH aq Cu OH 2 s 2NaNO3 aq 2 Cu OH 2 s Heat CuO s H O g 3 CuO s H SO4 aq 4 CuSO4 aq Zn s CuSO4 aq H O 1 Cu s ZnSO4 aq

3 In aqueous solution NiCl absorbs light at 702 nm and NiBr42 absorbs light at 756 nm Which complex has the greatest crystal field splitting energy A Does this make sense based on the spectrochemical series

For H3O 3 6x10 9 M determine the pH Express your answer using two decimal places 8 44 8 0 8 4 8 78

What is diprotic acid A diprotic acid contains two hydrogen ions that will dissociate in solution A diprotic acid does not contain any hydrogen ions that will dissociate in solution A diprotic acid contains at least two hydrogen ions that will dissociate in solution

What happens to OH in an aqueous solution when H3O increases decreases O increases don t change

The decomposition of ammonia can be used for the production of hydrogen gas in all fuel cells The decomposition reaction provides high power density and does not produce carbon dioxide making ammonia a desired fuel Answer the following word problems related to this reaction point values given with problem 1 Draw the MO diagram for the hydrogen gas molecule Be sure to include clear labels for each part of the diagram 6 pts 2 If an electron was added to the hydrogen gas molecule forming the H anion how would that affect the bond order 3 pts 3 Based your answer to the previous question rank the bond energies of H2 H and H 3 pts 4 BONUS Based on your MO diagram is the hydrogen molecule paramagnetic or diamagnetic Explain your reasoning 2 pts 5 The MO diagram for N is below Use this diagram to calculate the bond order for N2 4 pts N dy 0 N Energy 6 Draw the Lewis structure for N2 3 pts 7 Is the MO diagram for N consistent with this Lewis structure you drew Explain your reasoning 3 pts

A chemist must prepare 750 0 mL of sodium hydroxide solution with a pH of 12 70 at 25 C She will do this in three steps Fill a 750 0 mL volumetric flask about halfway with distilled water Weigh out a small amount of solid sodium hydroxide and add it to the flask Fill the flask to the mark with distilled water Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step Round your answer to 2 significant a

1 What is the difference between nuclear fusion and nuclear fission 2 Why must special isotopes of Uranium be used to make a nuclear bomb 3 Describe a chain reaction

9 8 10 11 12 13 7 1 What is the molar mass of ammonium phosphate NH4 3PO4 2 What is the molar mass of lithium sulfate Li SO4 3 What is the molar mass of aluminum oxide Al S3 Part B Balancing Chemical Equations 6 K Cl2 KCI 4 What is the molar mass of barium nitrate Be NO3 2 5 What is the molar mass of magnesium hydroxide Mg OH 2 NH3 H2SO4 NH4 2SO4 Fe Al2O3 Fe2O3 AlBr3 K2SO4 2 AICI 2 AI 3Cl MgF2 Li2CO3 MgCO3 Al HCl H KBr AIC13 Al CH4 02 CO2 H O Al2 SO4 3 LIF places Part C Mole to Mole Stoichiometry Calculate Give answers with 3 decimal places 14 Given this reaction 3 02 4 Al 2 Al2O3 How many moles of aluminum Al are needed to react with 4 60 moles of oxygen 0z 15 Given this reaction 1 Be 2 H 0 1 Be OH 2 1 H ow many moles of Be OH 2 can be produced from 9 28 moles of Be

29 2 points How many atoms would there be in 22 0 g of C H6 4 44x1024 4 44x1023 3 53 x 1024 2 83 x 1025 Previous

What is the daughter nucleus nuclide produced when 213 Bi undergoes alpha decay Replace the question marks with the prope integers or symbols daughter nucleus nuclide I

2 The crystal field splitting energy A which is the energy gap between the two sets of d orbitals for Ti H O 6 is 4 04 x 10 1 J a What wavelength of light will this complex absorb Hint use E hc to convert energy to wavelength b What color of light will the complex absorb c What color will the complex appear 3

A chemist is studying the following equilibirum which has the given equilibrium constant at a certain temperature N g 2H O g 2 H g 2NO g K 2 10 He fills a reaction vessel at this temperature with 9 0 atm of nitrogen gas and 4 7 atm of water vapor Use this data to answer the questions in the table below Can you predict the equilibrium pressure of NO using only the tools available to you within ALEKS yes no If you said yes then enter the equilibrium pressure of NO at right 0 atm Round your answer to 1 significant digit X P

1 Consider the chemical formula Naz Zn CN 4 and complete parts a b a Write the formula for the coordination complex and the counterion Make sure to include charges coordination complex counterion b In the table below draw the structure for the coordination complex CN coordinates through the carbon atom For the central metal ion give the coordination number oxidation state and number of d electrons Structure Coordination Number Metal Oxidation State Number of d Electrons

2 Al OH 3 Consider the following reaction Al SO 6 NaOH 3 Na SO A student mixes 6 51 mol Al2 SO and 2 75 mol NaOH and they react a What is the theoretical yield in moles of Na SO in this reaction

Write the pressure equilibrium constant expression for this reaction TiCl4 1 Ti s 2Cl g

Cryolite Na AIF s an ore used in the production of aluminum can be synthesized using aluminum oxide Balance the equation for the synthesis of cryolite equation 2Al O3 s 12NaOH 1 24HF g 4Na3AlF 18H O g

Draw the Lewis dot diagram for a H cation

Answer 6 3 BL 4 Consider the following reaction 2 AI 3 H SO4 Al SO4 3 3 H a How many moles of H SO4 are needed to react with 1 8 moles of Al Answer b If you produce 0 862 moles of H how many moles of H SO4 will you ne

What is the empirical formula of C8H1608 O CH2O2 O C H4O2 O CH2O

4 Consider the following reaction 10 Na 2 NaNO3 6 Na O N2 The chemical equation above shows the single replacement reaction between sodium and sodium nitrate If 2 52 moles of Na and 1 94 moles of NaNO3 mix a What mass of Na O can be produced b What is the limiting reactant c Explain how you know that this is the limiting reactant Be specific in your answer d What is the excess reactant

What is the work done when a volume decreases from 5 liters to 3 liters at 4 atm of pressure Conversion factor 1 liter atm 100J O 800 J of work done by the system O8J of work done by the system 800 J of work done on the system 81 of work done on the system

which of the following is true about moles a 12 01 moles of carbon 6 02x10 23 carbon atoms b one mole of carbon 6 02x1023 grams of carbon c the number of atoms in 1 mole of carbon the number of atoms in 1 mole of boron

Below is the Lewis structure of the hydrazine N H molecule H N N H Count the number of bonding pairs and the number of lone pairs around the left nitrogen atom in this mol bonding pairs lone pairs X S

8 35 36 37 38 20 D 39 HN 40 39 2 points The number of atoms in 32 0 g of O would be greater than equal to less than Previous the number of atoms in 48 0 g of 03

1 2 points Ag is one of the ions that is always insoluble in water O True O False

nswer 5 3 BL 2 AI 3 H SO4 Al SO4 3 3 H 1 Consider the following reaction a How many moles of H SO4 are needed to react with 1 8 moles of Al

which is true about molar mass a Molar mass is the same for every element b Molar mass is the mass of one mole c This number is the mass of particles in a mole

Practice Questions of mol to mol or mass to mass 1 In the chemical reaction of iron and sulfur how many moles of sulfur are needed to re with 1 42 mol of iron 2Fe s 3S s FeS s

Which of the following statements is CORRECT O I only 1 Increasing the volume of a piston does work on the surroundings II For a given amount of heat substances with large heat capacities have large temperature changes III The sign of heat added to a system is positive OI and III O Ill only O I II and III

2A 3B 50 4D 2 mol A produces 5 mol C 3 mol B produces 4 mol D 2 mol A reacts with 3 mol B 4 mol A produces 10 mol C 6 mol B produces 8 mol D 6 mol A reacts with 9 mol B 1 What do the coefficients of a balanced equation represent 2 If 6 mol A are reacted how many mol D are produced Explain as a group how you calculated this answer and show your work 3 If 15 mol B are reacted how many mol C are produced Make sure to show your work

44 2 points A 100 g piece of aluminum at a temperature of 100 C is placed in a beaker containing 100 g of water at a temperature of 0 C When the two reach the same temperature it will be less than 50 C impossible to determine without more information O O O 50 C greater than 50 C Previous

9 Excess oxygen is added to 34 5 grams of aluminum and heated under pressure How many grams of aluminum oxide are produced 10 How many grams of tin metal can be produced from the smelting heating of 4 5 kilograms of tin TV oxide

4 When 16 0 grams of sodium hydroxide are added to 34 1 grams of sulfuric acid how many grams of water will be produced 2NaOH H SO4 Na2SO4 2H O 5 How many grams of ammonia can be produced by reacting 45 9 grams of hydrogen with 26 6 grams of nitrogen

35 36 37 38 39 40 35 2 points What kind of reaction is shown below Ga NO 3 HC H302 precipitation acid base A double displacement no reaction Previous