P Block - Group 15 Questions and Answers

An atmospheric scientist decides to study the reaction between NO and O that produces dinitrogen pentoxide N O5 She fills a stainless steel reaction chamber with 3 3 atm of nitrogen dioxide gas and 3 2 atm of oxygen gas and raises the temperature considerably At equilibrium she measures the pressure of dinitrogen pentoxide to be 1 2 atm Calculate the pressure equilibrium constant K for the reaction that produces nitrogen dioxide at the final temperature of the mixture 2 NO2 g 1 2O2 g N2O5 8 Enter your answer to 2 decimal places

3 H The Lewis representation above depicts a reaction between hydrogen blue and a main group element from group electron s to complete its octet and gains these electrons by forming In this representation each Y atom needs atoms of H There are unshared electron pair s and The bonds in the product are H Y H jonic bonding electron pair s in the product molecule red bond s w

aved Ammonia has many applications from fertilizer to a refrigerant The following reaction describes how nitrogen and hydrogen react to make ammonia N2 g 3 H2 g 2 NH3 g The following statement regarding the Haber process which is used by humans to manufacture ammonia contains an error Statement The Haber process changes the state of ammonia from gas to liquid which prevents the forward reaction from occurring Select the option that corrects the error in the statement The Haber process changes the state of hydrogen from gas to liquid which prevents the forward reaction from occurring The Haber process changes the state of ammonia from gas to solid which prevents the forward reaction from occurring The Haber process changes the state of ammonia from gas to liquid which prevents the reverse reaction from occurring The Haber process changes the state of ammonia from gas to liquid which allows the forward reaction to occur

Which of the following classes of organic molecules is broken down during the industrial process of thermal cracking Alkane Amine Aldehyde Alcohol

Which of the following is the correct condensed electron configuration for nickel Ni using the Diagonal Rule Ne 4s 3d4p NeJ45 30 4p O Ar 4s 3c 4p6 Ar 4s 3d

Estradiol is a female sexual hormone that causes maturation and maintenance of the female reproductive system Elemental analysis of estradiol gave the following mass percent composition C 79 37 H 8 88 O 11 75 The molar mass of estradiol is 272 37 g mol Part A Find the molecular formula of estradiol Express your answer as a chemical formula 0 A O

Which of the following represents the spin quantum number Oms

Determine AHO kJ for the following reaction using the listed enthalpies of reaction 2NO2 g 4 H O 1 AHO kJ 180kJ AHO kJ 112kJ AHO kJ 571 6kJ N2 g 2O2 g N2 g O2 g 2NO g 2NO2 g 2NO g O2 g 2H2 g O2 g H O l

Review Topics Refer to the following phase diagram not to scale for xenon P atm 57 6 1 00 0 37 152 0 161 3 165 0 289 7 Choose all that apply T Kolvin A sample of xenon at a pressure of 0 370 atm and a temperature of 173 K is compressed at constant temperat of 62 5 atm Which of the following are true References The sample is initially a solid The sample is initially a gas The final state of the substance is a liquid The solid initially present will vaporize One or more phase changes will occur

c i HNO2 can have few possible structures Based on their formal charges an considerations which structure is more stable other Show the process for formal charge calculation for at least one of the atoms Formal H N O H N Charge N H 0 of N O i O ii 0 A B ii What advantages of this stable structure has over others C

8 What is the hybridization of the As atom in the ASF molecule A sp B sp C sp D sp d F 3 12

48 2 points What is the conjugate base in the following equation HCI NH3 NH4 Cl CI NH4 HCI

50 2 points What is the base in the following equation 3 PO4 HNO3 NO3 HPO4 PO 3 HNO3 HPO4 NO3

How many unpaired valence electrons are there in a phosphorous atom? 0 1 2 3 4

Heat of Formation Worksheet Use a standard enthalpies of formation table to determine the change in enthalpy for each of these reactions. a) NaOH(s) + HCl(g) ----> NaCl(s) + H₂O(g) b) 2 CO(g) + O2(g) ---> 2 CO₂(g) c) CH4(g) + 2 O2(g)---> CO₂(g) + 2 H₂O(l) d) 2 H₂S(g) + 3 O2(g) ---> 2 H₂O(1) +2 SO2(g) e) 2 NO(g) + O2(g) ---> 2 NO₂(g)

From the plausible electronic configuration of yet undiscovered element number 165, predict which of the elements from the second row in the periodic table has chemical properties similar to properties of this undiscovered element. N U Be C O F Ne

Which of the following neutral elements would be expected to have three unpaired electrons? (Hint: Draw the electron diagram for each) boron (B) lithium (Li) nitrogen (N) neon (Ne) chlorine (CI)

A student is describing a molecular geometry of the nitrate ion as having four electron regions. Do you agree with this statement? Justify your answer and provide any corrections details if you need to.

When 5.5 g N₂ reacts with 2.2 g H₂ in the reaction shown below, how many grams of ammonia (NH3) will be produced? Show your work or explain your process. N₂ + 3 H₂ --> 2 NH3

Choose the least polar bond. C-N F-CI OH H-CI

A compound is found to contain 19.73 % nitrogen and 80.27 % fluorine by mass. To answer the question, enter the elements in the order presented above. QUESTION 1: The empirical formula for this compound is QUESTION 2: The molar mass for this compound is 71.01 g/mol. The molecular formula for this compound is

For the molecular compound phosphorus triiodide, what would you multiply "grams of PI3" by to get the units "moles of PI3" ? grams PI3 ?

A compound is found to contain 14.88 % phosphorus and 85.13 % chlorine by mass. . QUESTION 1: The empirical formula for this compound is_____? QUESTION 2: The molar mass for this compound is 208.2 g/mol. The molecular formula for this compound is_____?

With respect to periodic properties, the CORRECT statement is Electron affinity order is F>O > Cl First ionisation energy order is Al> Mg > K Atomic radius order is N> P > As Ionic radius order is K+ > Ca2+ > Mg²+

A sealed chamber contains an equilibrium mixture of NO₂ and N₂O4 at 300 °C. The partial pressures of NO2 and N2O4 are 1.8 and 24.1 atm, respectively. What is the value of Kp for the dimerization of NO2 2 NO₂(g) = N2O4(g), at 300 °C?

Which of the following statement is incorrect regarding allotropes ? Rhombic sulphur is the most stable at room temperature. White phosphorus is the most reactive among allotropes of phosphorous. Yellow phosphorus is soluble in CS₂ while red phosphorus is not Graphite have sp2 while diamond has sp hybridised 'C' atom.