Practical Detection Questions and Answers

A binding energy curve is a plot of binding energy per nucleon versus atomic number In what region of the binding energy curve are the most stable elements found A in the lower left region low atomic mass B in the central top region moderate atomic mass C in the lower right region heavy atomic mass D binding energy is not dependent on atomic mass

31 A student forgot to add the reaction mixture to the round bottom flask at 27 C but instead he placed the flask on the flame After a lapse of time he realized his mistake and using a pyrometer he found the temperature of the flask was 477 C What fraction of air would have been expelled out a 60 b 30 c 100 d 75

find out weather there is a reaction if there is complete and balance it if there is no reaction write down no reaction Ca HCI Sb H2o with heat Al H2o with heat Pb CuNo5 Fe NaCl

The standard biological reaction Gibbs energy for the removal of the phosphate group from adenosine monophosphate is 14 kJ mol 1 at 298K What is the value of the thermodynamic standard reaction Gibbs energy

Rupa took 3 mL of sodium sulphate solution in a test tube and added about 3 mL of barium chloride solution to it She observed hat The solution turned black O Red precipitate was formed O White precipitate was formed The solution turned red

The value of van t Hoff factor i will be equal to 2 for Ourea Oglucose O sucrose NaCl Which one of the following salts would have the same value of the van t Hoff

Osmotic pressure for colloidal solution comparing to true ones is Select one O a less O b more c equal d an addition information is needed Previous page Next page

Which of the following is a strong electrolyte O AgNO3 O NH3 OC H O HF O O O

The following reaction then occurred 3H g N g 2NH3 g The equilibrium concentrations are NH3 g 0 80 M H g 2 8M N g 1 6M The value for K for the formation of ammonia is a 0 018 Ob 0 047 O c 55 d 8 8 e 0 18

Ozone decomposes to oxygen according to the equation 203 g 302 g Select the equation that relates rate of O3 in terms of the rate of formation of O2 a rate 03 Ob rate 03 Oc rate 03 Od rate 03 O e rate 03 rate 0 rate O 2 rate 02 3 rate O rate O

Which of the following is true for a system whose equilibrium constant is relatively large a It will take a short time to reach equilibrium O b It will take a long time to reach equilibrium Oc The equilibrium lies to the left d The equilibrium lies to the right

Which of the below diagrams would represent the catalyzed reaction when compared to the uncatalyzed reaction diagram baker Energy kJ O b 04 50 45 40 35 30 25 20 15 10 5 0 Energy kJ Energy kJ Energy kJ 50 45 40 35 30 25 20 15 10 5 0 2458425950 35 30 15 10 50 H 45 40 35 30 Extent of reaction Extent of reaction A Extent of reaction

Indicate the mass action expression for the following reaction X g Y g 2W g V g O a 2W V x y O b XY w v Oc W v X Y Od X Y W V O e W V X Y

What is the pH of a solution with an H of 1 0 x 10 M 01 3 O 11

Under certain conditions the decomposition of ammonia on a metal surface gives the following data NH3 M 1 0 x 10 32 0x 10 3 3 0 x 10 Rate M h 1 5 x 10 61 5 x 10 61 5 x 10 6 Determine the reaction order with respect to NH3 a 0 Ob 1 Oc 2 Od 3

What happens at the equivalence point in an acid base titration the pH of the solution is 1 the indicator is most colorful there is an equal amount of moles of acid and base the indicator has changed color

What is the H concentration for a solution that has a pH of 10 4 1 02 M 3 98 x 10 11 M 1 04 x 10 1 M 1 02 M

2 Calculate the theoretical mass percentage of potassium chloride in potassium chlorate Show all steps include measurement units and follow the significant digits convention

Given the following reaction at equilibrium 4NH g 50 g 4NO g 6H O g According to Le Chatelier s principle what will happen to reaction if ammonia NH gas is added to the system O a More oxygen will be produced Ob The value of the equilibrium constant will be changed Oc The equilibrium would shift to the products right Od The equilibrium would shift to the reactants left e No change

References A steel cylinder cont mixture of nitrogen oxygen and carbon gases The total pres he tank is 1690 torr pressure exerted by nitrogen and oxygen and 540 torr respect What is the partial p n torr of the carbon dioxide in the mixtu Enter your answer t significant figures PCO Submit Answer to

What ions go into solution when potassium carbonate solid dissolves in water OK Co OK CO3 OK CO3 OK C 0 OK C

A solution of water and a nonvolatile nonionizing compound is placed in a tube with a semipermeable membrane on one side The tube is placed in a beaker of pure water What initial net effect will occur Water will flow from the beaker to the tube Water will flow from the tube to the beaker The compound will pass through the membrane into the solution Nothing will move through the membrane either way Equilibrium is immediately established

Which structure is consistent with this IR spectrum O O 0 8 0 6 0 4 0 2 0 0 OH OH fo 3000 2000 Wavenumber cm 1 1000

How many millimeters are in 9 221x10 5 km 4

What is the mass of 1 25 L of kerosene Kerosene has a density of 0 820 g mL

How many pints are in 635 mL

Which of these liquid compounds will give a orange precipitate when treated with Br2 in presence of NaOH ethylacetate Benzaldehyde butanal pentan 3 one

Perform the following calculations and round off the answers to the proper number of significant figures Report answers in scientific notation 124 65 756 12 86 0 7805 0 01 4 03 x 10 2 2 04 x 10 2 2 31 x 10 1 999 x 10 8 15 x 104 x 4 0 x 10 5 2 30 x 10 9 2 x 10

The following 3 molecules are dissolved in ether and extracted with 3M NaOH Which of the following correctly describes the compositio of the two layers 1 OH 3 O Aqueous 1 Organic 2 3 O Aqueous 3 Organic 1 2 Aqueous 2 Organic 1 3 O Aqueous 1 2 Organic 3 2 NH

Which of the following can impact the rate of reaction select all that apply Doubling the concentration of the reactants Adding a Catalyst Lowering the reaction temperature Doubling the reaction volume of an aqueous phase reaction all liquids Doubling the reaction volume of a gas phase reaction

Which solid will be least soluble in water O CaSO4 FePO4

Explain the Dynamic Equilibrium that exists in a saturated solution

The equation below is known as the EA k Ae RT a Van t Hoff equation Ob Arrhenius equation Oc rate law d Henderson Hasselbalch equation e Clausius clapeyron equation

Estimate the Average Rate of disappearance of A between Os and 35s given the below data for the reaction of A 2B M 1 2 1 0 8 0 6 0 4 0 2 0 0 a 0 0053 M s Ob 0 045 M s c 45 M s S d 189 M s 0033 M 10 15 20 time s 25 T 30 6 35 40

What is the multiplicity of the protons on the indicated carbons in the H NMR spectrum O I doublet II singlet III singlet OI doublet II doublet III singlet OI singlet II singlet III singlet OI singlet II doublet III singlet

Consider the reaction 8 H S g 4 O g 8 H O g Sg g The average rate of consumption of O is 18 9 M s over the first two minutes What is th average rate of formation in M s of Sg during the same time interval Enter your answer to 2 decimal places

Use the information and samples to answer the following question The process of freezing is shown for two samples The smaller circles represent a solute Which statement predicts and explains which would have the lowest freezing point Sample A has the lowest freezing point because more energy must be removed to have the particles line up in a solid arrangement Sample A has the lowest freezing point because to have the particles packed close together you need to have only one type of particle or solute Sample B has the lowest freezing point because the solute particles interfere with the attractive forces among the solvent particles Sample B has the lowest freezing point because the solute particles freeze at a lower temperature

If you have 16 2 mol copper I oxalate what mass of copper I ions is in the sample

The molar mass of S F10 is OA 358 60 g mol B 254 10 g mol OC 127 05 g mol OD 222 04 g mol

Scarlet Letter and answer the question These words are spoken by Hester to Dimmesdale when the townspeople wanted to separate Hester and her child Speak thou for mel cried she Thou wast my pastor and hadst charge of my soul and knowest me better than these men can I will not lose the child Speak to me Thou knowest for thou hast sympathies which these men lack thou knowest what is in my heart and what are a mother s rights and how much the stronger they are when that mother has but her child and the scarlet letter Look thou to it I will not lose the child Look to it Which among the following lines phrase that Hester speaks to convey a subtle message to Dimmesdale Speak thou for me cried she Thou knowest for thou hast sympathles which these men lack

on Posttest Points 2 Question 3 Why do you think Hester refused to name her lover and his identity when asked by the Puritan society Hester does not want her society to know about her personal life Hester has multiple affairs and therefore she does not want to reveal all the information to the society which will create a problem for everybody Hester is aware that if her secrets are revealed the punishment that Dimmesdale would undergo will be far worse than hers Hester is aware that Dimmesdale and his family will not like her reveal their secret life and therefore Hester remains silent 0

What is the pH of a 0 00065 M solution of HCI

A student is trying to convert nanometers into meters and she knows that there are 1 10 nm in 1 m She 1 m 1x10 nm 1 m expresses this ratio as either 1x10 nm This ratio is called a n O molar ratio O unit O dimensional factor O conversion factor O Avogadro factor or

D S 2 methyl 1 butyn 3 ol the percent composition of a mixture of S 2 butanol a 25 13 52 and R 7 anol a 13 52 with a specific rotation a 25 6 760 observed A 75 R 25 S B 25 R 75 S C 50 R 50 S D 67 R 33 S E 33 R 67 S utyn 1 ol

What is the result of the following calculation to the correct number of significant figures 4 3 105 8 01 106 9 114 107 3 0018 10 O 1 3x10 5 O 1 1x1014 O 1 25x1027 K

4 What is the density of a solid in g mL with a mass of 2174 mg and a volume of 1 632 cm

What is the volume of 8 25 kg of isopropyl alcohol Isopropyl alcohol has a density of 0 786 g mL A

What is the density of a solid with a mass of 314 mg and a volume of 1 26 cm

How many kilograms are in 5 71x1012 ng

Complete the following unit conversion 7 65 1011 nm to km to