Solution: Identify the suitable reagent for the given transformation. The equilibrium between water vapour and liquid water in a closed container is an example of heterogeneous equilibrium. Why does the acetylation of —NH2 group of aniline reduce its activating effect? The NH2- anion is the conjugate base of ammonia (NH 3). All solutions are explained using step-by-step approach. At positive excitation bias, more-than-one emission peaks are observed and the excitation and emission mechanisms become complicated. Not all acids are created equal. The Ka for a weak acid is much less than one. First, assign a value of −1 to each acidic residue (Asp [D], Glu [E], and the C-terminal –COOH). 39 Likes, 2 Comments - Stanford Family Medicine (@stanfordfmrp) on Instagram: “Congratulations to our residents Grace and Jenny on completing their first rotation as intern and…” NCERT Exercises Questions. Polyprotic acids contain more than one ionizable hydrogen. The Ka for a strong acid is extremely large. Question 1.3 Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass. Academia.edu is a platform for academics to share research papers. Solution: The acetylation of —NH2 group of aniline reduces its activating effect because the lone pair of electrons on the nitrogen of acetanilide interacts with oxygen atom due to resonance. However, in the materials developed to date, the activation of CO 2 typically requires elevated temperatures (>100 °C) and pressures. More recently, MOF-based catalysts active at ambient conditions, i.e., room temperature and 1 atm of carbon dioxide, have been developed. a) ch3ch2 ch2oc(ch3)3 b) ch3ch2oc(ch3)3 c) ch2=c(ch3)2 d) ch3ch2 ch=c(ch3)2 Read the passage given below and answer the following questions: (1x4=4) The amount of moisture that leather adsorbs or loses is determined by temperature, relative humidity, degree of porosity, and the size of the pores. Next, assign a value of +1 to each basic residue (Arg [R], Lys [K], His [H], and the N-terminal -NH2), and then calculate the overall charge of the peptide. Question 1.1 Calculate the molecular mass of the following : (i) H2O (ii) CO2 (iii) CH4 Question 1.2 Calculate the mass per cent of different elements present in sodium sulphate (Na2SO4). the potential of a reducing fluid of Sodium Dithionite in seawater to alter surface wettability. In this study, the adhesion of polar (-NH2 and -COOH) and non-polar (-CH3) crude oil components to the pore surfaces of Bandera Brown, an outcrop of similar mineralogy to reservoir sandstones, was investigated using Atomic Force Microscopy to det. Find the training resources you need for all your activities. what is the ionization constant at 25oc for the weak acid (CH3)2 NH2+, the conjugate acid of a weak base (CH3)2NH,kb= 7.4 \times 10^-4? If any step of the reaction yields two (or more) products, indicate the major product (the one that you will use for the next step). Get NCERT Exemplar Solutions for Class 12 Chapter Amines here. Studyres contains millions of educational documents, questions and answers, notes about the course, tutoring questions, cards and course recommendations that will help you learn and learn. The reaction of CO 2 with epoxides is an example where MOFs have been found to be especially efficient catalytic systems. (Note that although I’m talking about NaNH 2 here, the bases LiNH 2 and KNH 2 … Ionization of the substituent increases solubility, e.g. Explain why MeNH2 is a stronger base than MeOH? + Polar groups such as –OH capable of hydrogen bonding with water molecules impart high solubility Non-polar groups such as –CH3 and –Cl are hydrophobic and impart low solubility. If the overall charge of the peptide is … Ionization of a polyprotic acid occurs in a stepwise manner, where each step is characterized by it own equilibrium constant (Ka1, Ka2, Ka3). If you’ll recall, the weaker the acid, the stronger the conjugate base – and since NH 3 has a pKa of 38, NH 2 is a strong base indeed. All above The transformation reaction is efficient when benzene with D on C1 and CH2CH2CH2CH3 on C4 1. –COOH and –NH2 are slightly hydrophilic whereas –COO– and –NH3 are very hydrophilic. BeTrained.in has solved each questions of NCERT Exemplar very thoroughly to help the students in solving any question from the book with a team of well experianced subject matter experts. Practice Amines questions and become a master of concepts. 46. Equilibrium in a system having more than one phase is called heterogeneous equilibrium. 45. H 2 O(l) H 2 O(g) In this example, there is a gas phase and a liquid phase.