General Questions and Answers

Phosphine PH3 undergoes a first order decomposition into phosphorus P4 and hydrogen at 680 C If the initial concentration of phosphine is 1 1 x 10 6 g L and after 180 s the concentration has dropped to 0 30 x 106 g L what is the rate constant for this process in s k i S1

radius 1 the largest atomic radius 3 the smallest atomic radius Ba CI AI Question 18 2 5 points Listen What is the electron configuration of the Al ion 1s 2s 2p63s 3p4 1s 2s 2p63s 3p6

Which wavelength of light has the highest frequency 20 km 20 pm 20 nm 20 cm 20 mm

Lab Report Abshir Factors Affecting Solution Formation 1 Independent variable Temperature Solute Salt E Introduction Type your introduction here Make sure to include the required items on the rubric and on the directions found in 2 03 Laboratory Factors affecting Solution Formation 1 ON PAGE 5 What is dissolution The process by which a solid enters solution What is collision theory Collision theory is the idea that particles must collide in order to react and they must collide hard enough with enough energy to break the bonds activation energy What was the purpose of your experiment To investigate the effects of salt crystal size degree of mixing and temperature on the rate of which I Experimental Methods Type the experiment methods here The lab instructions is the starting point but in this spot you type in exactly what you did in the experiment

Albuterol is commonly used in breathing treatments to treat conditions such as bronchitis and asthma Identify the major functional groups present in this molecule OH golx HO HO Answer Bank alkene ester aldehyde alkyne ketone alcohol aromatic amide alkane nitrile ether amine carboxylic acid

In the combustion of hydrogen gas hydrogen reacts with oxygen from the air to form water vapor hydrogen oxygen water If you burn 36 5 g of hydrogen and produce 326 g of water how much oxygen reacted mass of oxygen 298 6

Calculate the de Broglie wavelength of a 142 g baseball thrown at 44 m s

Which of the following elements is NOT a solid at room temperature CI Pt O AI Fe Ag Question 10 2 5 points 1 Listen The element that corresponds to the electron configuration 1s 2s 2p63s 3p64s 3d5 is Cu O Ti O Cr

Identify the spectator ions from the reaction above I Ag II CI III Na IV S2 O a III and IV only O b I and II only O c II and III only O d I and IV only QUESTION 4 What is the reaction type of the following H C O4 aq NaOH aq Na C O4 aq H O 1 rodox precipitation d gas evolution

Calculate the molecular weights for NH3 and SF NH 17 03 mass of NH3 X Incorrect g mol SF How many grams of NH3 are needed to provide the same number of molecules as in 0 55 g of SF g 146 07

Arrange these elements in order of increasing first ionization energy Al Cl Si Si Cl Al Al Si CI OAI CI Si OCI Si AI Question 4 2 5 points Listen Identify the element that has a ground state electronic configuration of Ar 4s 3d7 iron tungsten cobalt

The second order decomposition of HI has a rate constant of 1 80 x 10 M s How much Hl remains after 27 3 s if the initial concentration of HI is 4 78 M 4 55 M 3 87 M 2 39 M 0 258 M 2 20 M

What period 3 element has the following ionization energies all in kJ mol IE1 1012 IE2 1900 IE3 2910 IE4 4960 IE5 6270 IE6 22 200 P Mg Os Ca

The enthalpy of fusion of aluminum is 10 7 kJ mol How many grams of aluminum can be melted by adding 81 5 kJ of energy to the metal at its melting point Edit Format Table

A reaction is found to have an activation energy of 108 kJ mol If the rate constant for this reaction is 4 60 x 106 s at 275 K what is the rate constant at 366 K O 0 58 S 1 O 1 7 s 1 O 1 9 x 10 4 5 1 5 4 x 10 5 5 1 12 s1

Use Charles s Law to interpret the following problem and then select the correct answer below A 250mL compressed tank is filled with Hydrogen gas and has a pressure of 100kPa If all of the Hydrogen gas is removed from the tank and pumped into a 1L tank what happens to the temperature of the gas options The temperature in the 250 mL tank decreases The temperature in the 250 mL tank increases The temperature in the 1 L tank increases All of the above None of the above

Given the following information for benzene C6H6 AHvap 33 8 kJ mol AHfus 9 9 kJ mol Specific heat gas 82 4 J K mol Specific heat liquid 133 J K mol Specific heat solid 118 J K mol Boiling point 80 08 C Melting point 5 6 C Calculate the amount of heat needed in kJ to convert 16 000 g of solid benzene at 5 1 C to liquid benzene at 38 6 C Report your answer to 2 decimal places Your Answer

Good Master Dimmesdale the responsibility of this woman s soul lies greatly with you It behooves you therefore to exhort her to repentance and to confession as a proof and consequence thereof The directness of this appeal drew the eyes of the whole crowd upon the Reverend Mr Dimmesdale a young clergyman who had come from one of the great English universities bringing all the learning of the age into our wild forest land How do the people in the town consider Mr Dimmesdale 1 According to people Mr Dimmesdale is the bringer of knowledge to the town II People consider Dimmesdale as a symbol of civilization in the wilderness III People accept Dimmesdale as a man with both good and evil in him IV People do not trust Dimmesdale as he is the sinner in the town I and II OII and III III and IV

equilibrium BaSO4 s Ba aq SO2 aq 1 What occurs when Na2SO4 s is added to this system increasing the concentration of SO4 aq 2 2 H O 3 presenting a 4 The equilibrium shifts to the left and the concentration of Ba aq decreases The equilibrium shifts to the left and the concentration of Ba aq increases The equilibrium shifts to the right and the concentration of Ba aq decreases The equilibrium shifts to the right and the concentration of

What is the mole fraction of urea CO NH 2 MM 60 06 g mol in a solution prepared by dissolving 4 0 g of urea in 32 0 g of methanol CH3OH MM 32 04g mol 0 89 0 11 0 94 O 0 19 0 063

Substance H20 Grain Alcohol Ethanol Benzene 0 00 98 m p C 5 0 AHfus J g 333 98 7 126 5 b p 100 00 64 80 AHvap J g 2 260 841 394 Specific Heat C J g C Ice 2 09 Water 4 18 Steam 1 7 Solid 1 2 Liquid 2 4 Gas 1 9 Solid 0 55 Liquid 0 96 Gas 1 09 300 grams of liquid Benzene at 12 C is heated to 115 C How much energy was needed to make this change Show work for all steps

AS 19 8 KJ K molsill H g Cl g 2HCl g Does the above reaction increase or decrease in disorder Is it favorable or not favorable

A 7000 L weather balloon rises from the ground where it is at STP to the upper atmosphere where the temperature is 12 C and the pressure is 94 atms What will the volume of the balloon be at this elevation

What is the freezing point of a 0 19 m solution of glucose C6H12O6 in water Kf for water is 1 858 C m 0 71 C 0 18 C 0 35 C 0 18 C 0 71 C 0 35 C

Question 18 19 For the following unbalanced equation S s O g H O 1 H SO4 aq K At what temperature K does O have to be if the volume of the gas is 5 01 L with a pressure of 0 860 atm to produce 17 55 grams of H SO4

The image below shows a hypothetical biosynthetic pathway in which substrate A is converted to product D using enzymes 1 2 and 3 A AG 7 kJ mol B O2 and 4 AG 4 kJ mol 1 2 3 C AG 5 kJ mol 2 3 1 Based on overall AG of the pathway this reaction would proceed faster at a lower temperature 2 Overall the pathway is spontaneous 3 D compound has more potential energy than compound B 4 All the enzymes 1 2 and 3 of the pathway are encoded by a single gene D Which of the following statements about this pathway is correct

On top of Mt Yale in Colorado elevation 14 202 feet you step on a scale and weigh 183 pounds using the same scale in New Orleans elevation 4 feet you would weigh A more than on top of Mt Yale B less than on top of Mt Yale C the same as on top of Mt Yale

he half reactions involved in the lactate dehydrogenase LDH reaction and their standard reduction potentials are see attached Calculate AG at pH 7 0 for the DH catalysed reduction of pyruvate under the following conditions lactate pyruvate 1 and NAD NADH 1 Pyruvate 2 H 2e lactate NAD 2 H 2e NADH H co 0 185 V gor 0 315 V 29

2N2 g 602 g 2H g 4HNO3 1 Will the above reaction release or consume heat AH 696 KJ mol

The provider ordered olanzapine 7 5 mg PO daily Available is olanzapine 2 5 mg tablet How many tablets will the nurse administer per dose Record answer as a whole number Do not use a trailing zero Blank 1 Blank 1 Add your answer

91 9 Mark this and return Earning above 1 200 a year Earning below 1 200 a year What does the graph show about the distribution of income during the late 1800s Most people were in the low income bracket and only a few earned large incomes O Most people were in the high income bracket and only a few had low incomes The entire population earned low incomes Save and Exit Next Subm

ue or False The atoms in solids are moving med smuan102 10

13 De ionized water is added to a volumetric flask containing 8 60 g of KNO3 s until the final volume is 150 mL The concentration of KNO3 aq in the solution is mol L 0 0 0128 01 76 0 567

An unknown compound has the following chemical formula Fe NO3 where x stands for a whole number Measurements also show that a certain sample of the unknown compound contains 9 20 mol of nitrogen and 3 07 mol o Write the complete chemical formula for the unknown compound 0 00

Draw a phase change diagram and label all the parts Include which areas are breaking intermolecular bonds and in which KE increases

30 0 grams of Copper I and 25 0 grams Sulfur react a Predict the reaction and write a chemical equation b Which one is the Limiting Reagent Show all work in determining this c How much product will you obtain

Which is larger Na or Na bas agertz art lip zgners feinco citadel Br or Br 20hofshehintzaws

Which alomon deringe aloctrons more Si or N

table Experiment 1 2 3 4 5 4 HBr g O g 2 Br g 2 H O g HBr M 0 M 0 120 0 490 0 142 0 120 0 120 0 630 0 230 0 630 0 630 0 863 I a Find the order of the reaction with respect to HBr b Find the order of the reaction with respect to O Hint need to do long version not the shortcut to find rate order here Type equation here c What is the overall order of the reaction Rate M s aka mol L s 0 0267 0 00190 0 0442 0 0846 0 435 d Write the rate expression e Calculate the rate constant k Kinetics Dry Lab 2 f If the concentration of HBr and O are 1 5 x 10 M and 3 25 x 10 respectively what is the rate of the reaction

Rank the following from largest to smallest Co Ga Sr Ar S Cs Ne Will it require more energy to remove an electron from Ca or P

Calculate the number of fissions per second for a 2 kg quantity of natural uranium and a neutron flux of 1 0 x 1013 cm s given that the thermal fission cross section for 235 U is 548 b Estimate the power produced Natural uranium has an atomic mass of 238 029 u and contains 0 72 of 235 U

19 How many moles of hydrogen atoms are there in one mole of H O 20 The percentage composition of a substance is 54 5 carbon 13 6 hydrogen and 31 8 nitrogen The molecular mass of the compound is 88g Calculate the empirical formula and molecular formula

An aqueous solution containing glucose has a vapor pressure of 17 2 torr at 25 C What would be the vapor pressure of this solution at 45 C The vapor pressure of pure water i 23 8 torr at 25 C and 71 9 torr at 45 C Vapor pressure If the glucose in the solution were substituted with an equivalent amount moles of NaCl what would be the vapor pressure at 45 C Vapor pressure torr torr

What type of bond is depicted in the following picture What are two unique features it has 0

Suppose a hydrogen 2 nuclide transforms into a helium 3 nuclide by absorbing a proton Complete the nuclear chemical equation below so that it describes this nuclear reaction 0 He 3 2 CARENES ST P Y

Explain why water will intermolecular bond with itself but not with oil 2 1 X Y or X Y X Linear X Pyramidal X Bent X X Y X X Trigonal Planar Square Planar Which of the above molecules will evaporate more easily X X Tetrahedral Draw a lewis structure for NH3 and label its partial charges tell its shape and if it is polar or nonpolar Draw a lewis structure for CCl4 and label its partial charges tell its shape and if it is polar or nonpolar nhwolls

How many grams of C3H8 must be used to produce 1 25 x 1025 molecules of H O 1 25 x 1025

Complete the following neutralization reaction Predict the products Underneath explain how the acid and base became neutral HCl aq NaOH aq

2HNO3 MgO Mg NO3 H O 2 2 6 How many liters of MgO are needed to react with 38 moles of HNO3 1 Show Work 1 Final Answer

Identify each substance as an Acid Base or Neutral Solution and indicate it s relative pH 7 7 7 NaCl aq H3PO4 aq Ba OH 2 aq