General Questions and Answers

Which statement below regarding covalent bonds is FALSE Electrons in a single covalent bond are mutually attracted to two nuclei The average bond length is the distance between the nuclei when the energy is at a minimum The energy of the interaction between two neutral atoms continuously decreases as their separation decreases The covalently bonded atoms are at a lower energy than the separated atoms Electron nucleus attractions must overcome electron electron and nucleus nucleus repulsions

The equilibrium constant for the chemical equation N g 3H g 2 NH3 g is Kp 0 0544 at 213 C Calculate the value of Ke for the reaction at 213 C Kc Enter numeric value

Determine the name for N 05 Onitrogen II oxide dinitrogen pentoxide Onitrogen oxide Onitrogen tetroxide as a

new equilibrium equation Create the equilibrium constant expression K for the new equilibrium reaction Kc C A A Answer Bank A B B C B C If the initial reaction contains 1 79 M A 1 49 M B and 2 25 M C calculate K for the new equilibrium reaction

Procedure Overview Given the formula of the compound the proper names for a large number of compounds are to be written Given the name of the compound the formulas for a large number of compounds also are to be written Your instructor will assign the exercises you are to complete Answer them on a separate piece of paper Be sure to indicate the date your lab section and your desk number on your Report Sheet Use the rules that have been described 1 Name the following binary salts of the representative elements g Ca P j K S m NH Br h KCN k K Te n NH S i KOH 1 K O o NH4CN 2 Name the following salts according to the old ic ous system and the Stock system a CrS b Cr O3 c Crl 6H O d CuCl a Na P b Na O d CaC e Cal c Na N f CaH e Cul f CuBr 4H O g HgCl h Hg Cl i HgO j Fe O3 k FeS 1 Fel 6H O p AlCl3 q Al O3 r AIN m Coo n CoBr 6H O 0 SnF4 p SnO q Cu 0 r Fe OH 3

7 Write formulas for the following acids a sulfuric acid b thiosulfuric acid c sulfurous acid d periodic acid e iodic acid f hypochlorous acid g nitrous acid h nitric acid i phosphorous acid j phosphoric acid k carbonic acid 1 bromous acid m chromic acid n permanganic acid o manganic acid p boric acid q oxalic acid r silicic acid

Give an example of a gas liquid suspension

The following excerpt is taken from The Scarlet Letter The narrator describes Dimmesdale s attitude toward the people around him Trusting no man as his friend he could not recognize his enemy when the latter actually appeared What can you infer on comparing Mr Dimmesdale s behavior with the social norms of the Puritan society The strict social norms have made people sin and hide information to avoid punishments O People started to distrust everybody that they can avoid punishments O People started to focus on God so that they can lead a righteous life OStrict social norms have helped people recognize their enemies and punich th

Which has the highest molecular mass Br 08 CBr4 BrF5 OIBr2

CO concentration parts per million 8 400 350 3 00 250 200 150 wwwm M 800 000 600 000 400 000 Years before present 200 000 2016 1900 1800 I 18 Which of the following trends is observed in the data a A constant increase with a greater rate of increase starting around the year 1800 b A slight decrease with a sudden increase starting around the year 1800 c Consistent fluctuations between 200 and 300 ppm d Regular fluctuations between 200 300 ppm with a sudden increase to over 400 ppm since the year 1800 19 What conclusion would make the most sense based on this data a Humans were not collecting CO data thousands of years ago so these data are likely false b Historic ice core CO levels are constantly changing so no general patterns can be identified c CO concentrations in the last 200 years are significantly different from levels in the past d The CO levels in the atmosphere have varied in the past so changes today are also explained by natural processes Que C

Which statement below is FALSE lonic bonds are typically formed when metal and nonmetal atoms interact The attraction between ions is primarily electrostatic Larger ions typically form stronger ionic bonds than smaller ions lonic bond strength depends primarily on the radii and charges of the ions As ion charge increases ionic bond strength increases

1 A calorimetry experiment determined that the combustion of 1 01 g of H g reacting with excess O g gave qsoln 143 kJ Calculate AH for the reaction oratory 8 9 10 H g O g H O 0 AH 9 Soln 2 In the space provided below combine equations 8 9 and 10 to obtain equation 7 It is not necessary to calculate AH A H 143 KJ

Calculate the molar mass of H C 42 03 g mol 62 03 g mol 23 03 g mol 60 03 g mol

8 Write formulas and name the hodgepodge of compounds resulting from matching all cations with all anions for each set Set 1 Cations Lit Cd Na Cu2 Vs Mg2 Name as acids Anions CIT SO NO 0 CO I Cations Fe Fe2 A1 Zn K VO Set 2 Anions PO 3 HPO 2 HCO CN CH CO or C H O IO Set 3 Cations Pb NH H aq 3 Mn Hg2 Sr Anions SiO3 S MnO4 HSO4 2 Cr 0 2 C 04

Write formulas and name the hodgepodge of compounds resulting from matching all cations with all anions for each set Set 1 Cations Anions CIT SO NO Cd Nat Vs Mg2 Name as acids CO3 r Cations Fe Fe2 Al Zn K VO Set 2 Anions PO HPO HCO CN CH CO or C H O IO Set 3 Cations Pb NH H aq Mn3 Hg S Anions SiO S MnO HSO Cr 0 2 C 0

Copper roofs on houses form patina copper carbonates over the course of years due to the reaction with oxygen carbon dioxide and water in the air What can you say about the activation energy

d 5 Name the following acid salts Use the older system wherever po j MgHASO4 k KH ASO4 1 KHCrO4 d NH4HCO e NaHS f KHSO3 g NaHSO4 H O h Li HPO4 i LiH PO4 a NaHCO3 b Ca HCO3 2 c KHC O4 6 Write formulas for the following compounds a potassium permanganate b potassium manganate c calcium carbonate d lead II carbonate e ferric carbonate f silver thiosulfate g sodium sulfite h ferrous sulfate heptahydrate i iron II oxalate j sodium chromate k potassium dichromate 1 nickel II nitrate hexahydrate m chromous nitrite n vanadyl nitrate o uranyl acetate p barium acetate dihydrate q sodium silicate r calcium hypochlorite s potassium chlorate t ammonium oxalate u sodium borate V cuprous iodate

H3ASO3 1 H O H AsO 21 2H is one of a pair of reactions in an experiment called the iodine clock reaction an example of chemical chaos Which of the following statements concerning this reaction is true 1 As is being oxidized from 6 to 8 2 As is being reduced from 8 to 6 3 As is being oxidized from 3 to 5 4 As is being reduced from

Spell out the full name of the compounc Copper Nitride

6 Write formulas for the following compounds a potassium permanganate b potassium manganate c calcium carbonate d lead II carbonate e ferric carbonate f silver thiosulfate g sodium sulfite h ferrous sulfate heptahydrate i iron II oxalate j sodium chromate k potassium dichromates muiboni 7 Write formulas for the following acids Pypliot a sulfuric acid b thiosulfuric acid c sulfurous acid d periodic acid e iodic acid burogen mf hypochlorous acid g nitrous acid h nitric acid i phosphorous acid 1 nickel II nitrate hexahydrate m chromous nitrite n vanadyl nitrate 0 uranyl acetate p barium acetate dihydrate O q sodium silicate r calcium hypochlorite s potassium chlorate t ammonium oxalate astuttedne u sodium borate v cuprous iodate j phosphoric acid k carbonic acid 1 bromous acid m chromic acid n permanganic acid 0 manganic acid p boric acid q oxalic acid r silicic acid

9 Write correct formulas for the following hodgepodge of compounds from Dry Labs 2A 2B and 2C a vanadium V fluoride b stannic oxide c silicon tetrafluoride d mercuric oxide e lithium hypochlorite f iodine trifluoride g ferrous oxalate h cuprous oxide i copper I chloride j calcium hydride k cadmium iodide 1 barium acetate dihydrate m ammonium sulfide n vanadium V oxide o titanium IV chloride p scandium III nitrate q nickel II acetate hexahydrate r mercurous nitrate s lead II acetate t ferric phosphate hexahydrate u ferric chromate v dinitrogen tetrasulfide w chromous acetate x calcium nitride y ammonium dichromate 7 silver acetate

Lab Data Verify your concentration calculation Concentration of thiosulfate solution mm Concentration of hydrogen peroxide solution mm Temperature of iodide solution C Volume of iodide solution 1 used mL Volume of thiosulfate solution S 032 used mL Volume of DI water used mL Volume of hydrogen peroxide solution H O used mL Time s Observations Initial concentration of iodide in reaction mm Initial concentration of thiosulfate in reaction mm Initial concentration of hydrogen peroxide in reaction mm Initial Rate mM s Temperature Concentration of iodide solution mm Trial 1 31 5 176 5 25 0 10 0 1 0 2 5 7 5 17 6 change color 47 6 1 5 63 0 042 Trial 1 Trial 2 31 5 176 5 25 0 10 0 1 0 5 0 10 0 26 4 change color 47 6 1 5 34 Trial 2 2 Trial 3 31 5 176 5 Trial 3 X

b 2 998x108 m S X 60 s 1 min Calculator answer X 60 min 1 hr X 1 day X 1 yr

6 626 x 10 34 Js Calculator answer 89 57 S

How many moles are there in 5 00 g of ethanol CH3CH OH MM 46 07 g mol 0 109 mol 5 00 mol 11 5 mol 0 210 mol 1 02 mol

For the reaction A aq B aq C aq D aq the equilibrium constant is 21 1 at 25 and 35 3 at 50 C What is the value of the standard Gibbs free energy change in kJ of thi reaction at 75 C

4 Dain has purchased a minivan for 24000 The value V in dollars of the minivan as a function of time t in t 24000 How long will it take for his minivan to 2 marks years depreciates according to the function V t depreciate to a one quarter of its initial value

3 Find the hydrogen ion concentration of a mildly acidic solution with a pH of 4 2 pH log H 2 marks

10 Write the correct formulas for the following matched common name chemical name compound See Appendix B Common Name Chemical Name oxalic acid nitric acid barium sulfate dihydrate a acid of sugar b aqua fortis c barium white fixed white d bitter salt Epsom salts e blue vitrol f calomel g caustic potash h Chile saltpeter sodium nitre sodium nitrate i chrome yellow lead IV chromate j Indian red jeweler s rouge ferric oxide k lime calcium oxide sulfuric acid magnesium silicate sodium sulfate 1 oil of vitrol m talc or talcum 1 Glauber s salt magnesium sulfate heptahydrate copper II sulfate pentahydrate mercurous chloride potassium hydroxide

Date Lab Sec Name Desk No 1 On the blank periodic table clearly indicate six of the following element sections using your own color code a Representative elements h Alkali metals b Transition elements i Alkaline earth metals c Inner transition elements d Chalcogens e Coinage metals f Metalloids g Post transition metals j Halogens k Noble gases 1 Noble metals m Lanthanide series n Actinide series Periodic Table

In chemistry class you are given 3 liquids Liquid A Liquid B and Liquid C One of these liquids is water which has a density of 1 0 g mL You also have an ice cube with a density of 0 92 g mL and a piece of cork with a density of 0 85 g mL When all 3 liquids are mixed together Liquid B is on the bottom The ice cube will float in B and sink in the other two liquids A piece of cork will float in Liquid A but sink in Liquid C what is the approximate density of liquid A Less than 0 85 g mL Between 0 85 g mL and 0 92 g mL Between 0 92 g mL and 1 0 g mL Greater than 1 0 g mL

In lab students were asked to make a statement as to whether adding mentos to coke was a chemical or physical change Coke and Mentos Coke Mento Mento dropped into Coke Coke exploding because Mentos were dropped into it Coke Which gives the best compelling evidence to classify this reaction as a chemical or physical change Physical matter is not lost in the reaction of coke and mentos Physical nothing new is produced the gas or carbon dioxide is merely separating from the solution when mentos and coke combine Chemical whenever a gas is given off a chemical change is always produced Chemical a new product is produced as evident by the geyser of foam coming off of the reaction

5 Refer to Figure 11 1 Which of the following has the highest ionization energy a carbon or oxygen c magnesium or aluminum b phosphorus or sulfur d magnesium or calcium

When auscultating the examination 4 A raspy machine like or blowing sound B An extra beat just before the S2 heart sound CA prominent S1 sound in the aortic and pulmonic areas D An S4 gallop Question 4 What is the part of the cardiac cycle in which the ventricles are contracting and pushing blood out of the chambers A Systole B Diastole C Hypotension 1 Point

nonbonding electrons H CO N2 NO 02 Question 6 1 point Listen Draw the Lewis structure for the nitrate anion NO3 Include resonance structures if necessary

What would be an expected finding on auscultation of the heart A The S1 heart sound is louder at the apex of the heart B The S3 heart sound sounds like Ken tucky A low pitched blowing sound is heard over the abdominal aorta A high pitched vibration is heard over the base of the heart Question 2 B What heart action results in the second heart sound S2 Beginning of diastole Closure of the mitral and tricuspid valves Isometric contraction Closure of the aortic and pulmonary valves 4

In the early 1900s what did it mean for cities to be dry Cities had severe water shortages and restricted water usage Cities imposed extremely high taxes on water usage Cities restricted the sale and consumption of alcohol Cities allowed consumption of alcohol as long as it was taxed

Latent heat of vaporization of a liquid at 500 K and 1 atm pressure is 10 0 kcal mol what will be the magnitude of change in internal energy in kcal of 4 mole of the liquid at the same temperature

55 50 g of sulfuric acid how many grams of hydrochloric acid will be produced

Where it the point of maximal impulse PMI located A B C D The 5th intercostal space left midclavicular line The 2nd intercostal space left costal margin The 4th intercostal space right midclavicular line The 3rd intercostal space midsternal area Question 8 In what situation would the nurse hear a rub when auscultating the heart A A murmur reaches a Grade VI B The pericardium is inflamed The left ventricle is enlarged The client holds their breath

Fumerase catalyzes the conversion of fumerate to malate fumerate H 0 malate The turnover number kcat for fumerase is 8 00x102 sec The Km of this enzyme for fumerate is 5 00x10 mol mL a In an experiment using 2 00x10 3 mol mL 1 what is Vmax mol ml sec 1

A student needs to determine the density of an irregularly shaped object This student prepares a solution mixture where the object is suspended The collected data is shown in the table below Object s density Liquid Determine the density of the object Dichloromethane Methanol g mL Density g mL 1 326 0 791 Volume mL 7 01 3 33

Draw a phase change diagram and label all parts

a 971 kg 68 2 kg 3 24 kg Calculator answer 1042 44 ite

What is the sound created by turbulence of blood flow through a malfunctioning heart valve A Bruit Murmur Hum Rub Question 14 Starting at the top of the chest what order does the nurse auscultate the heart valves A Aortic tricuspid mitral pulmonic B Mitral tricuspid pulmonic aortic

7 a Proceeding from left to right across a period of the periodic table the elements become more less metallic b Proceeding from top to bottom in a group of the periodic table the elements become more less metallic 8 Consider the generic equation for the reaction of the halogens X and Y X g 2Y aq 2X aq Y g Is X or Y the more reactive halogen Explain

Fill in the blanks by selecting one option from each menu ab Part 1 2 points aby Part 2 2 points ab Part 3 3 points aby Part 4 3 points 10 points Aluminum is a common metal used for everyday items such as aluminum soda cans and aluminum foil An aluminum soda can has a mass of 13 68 g and a small piece of aluminum foil has a mass of 2 41 g Which has the smaller specific heat Which has the smaller heat capacity A small piece of an unknown metal has the same mass as a small piece of aluminum foil 2 41 g Each piece of metal absorbs the same amount of heat and the aluminum foil undergoes a larger increase in temperature ww Which has the larger specific heat If both pieces of metal are cooled in a refrigerator and undergo the same decrease in temperature which will undergo the larger change in thermal energy

Allotropes of an element have different structures Allotropes of an element have different chemical and physical properties Not all elements have multiple allotropes Oxygen and ozone are examples of allotropes Carbon dioxide and carbon monoxide are examples of allotropes Question 2 1 point Listen Which bond below is longest The number in parentheses is the bond energy C C 348 kJ mol C F 453 kJ mol C H 411 kJ mol CI 339 kJ mol C 0 358 kl mol

Compound names for Cr203 HNO2 B216

How many Protons neutrons and electrons Phosphorus 33