Nh4 - Study guides, Class notes & Summaries

NH4Cl is being dissolved in water and this process is being studied in a styrofoam coffee cup with NO lid and the heat absorbed is measured by means of a thermometer immersed in the reaction mixture. Enter the correct thermochemistry term to describe the item listed. Answer: 1. NO lid = open system 2. Heat absorbed = Endothermic process Question 2 Not yet graded / 10 pts You may find the following resources helpful: Scientific Calculator Periodic Table Equation Table Links to an ext...

Chapter 3: Chemical Reactions 1. Which of the following cannot be determined from a balanced chemical equation? a. b. c. d. e. ANSWER: POINTS: TOPICS: OTHER: The number of molecules of reactants and products. The number of atoms of each element reacting. The number of moles of reactants and products. The relative mass of each reactant and product. Whether the reaction will proceed as written. e 1 3.1 Chemical Equations Comprehension 2. In the reaction given below, if 12 moles of aluminu...

PNP401 / PNH400 Exam prep Questions And Answers Graded A+

IB Chemistry SL: Topic 4 Latest Version Graded A Ionic Bond Electrostatic attraction between oppositely charged ions Covalent Bond Electrostatic attraction between a pair of electrons and positively charged nuclei, formed as a result of electron sharing Metallic Bond Electrostatic attraction between a lattice of positive ions and delocalized electrons Polyatomic ions ions with more than one element e.g. CaCO3, Al(OH)3, Mg(NO3)2, (NH4)2SO4, Ba3PO4, LiHCO3 Lattice ions arran...

CEM 141 Final Exam Questions and Answers Already Passed If one carbon wants 4 bonds, how many bonding orbitals can it have? A. 1 B. 2 C. 3 D. 4 D In graphite how many carbons is each carbon attached to? A. 2 B. 3 C. 4 D. 5 B How many orbitals should "mix" to form 3 bonds? A. 2 B. 3 C. 4 D. 5 B How many different compounds can you draw from C5H12? A. 2 B. 3 C. 4 D. 5 E. 6 B What is the formal charge on H for NH4+? A. +1 B. -1 C. +2 D. -2 ...

compound interest - 30 60 90 triangle 45 45 90 triangle - Solubitlity Rules - 1) group 1, NO3-, NH4+, ClO4-, C2H3O2- (acetate) soluble salt 2) Most Ag+, Pb2+, Hg2 (2+) salt insoluble (exept when paired with above). Plant Hormones (A CAGE) - Auxin / IAA (indoleacetic acid): plant growth, elongation, phototropism

(Lecture 3-5) A water contains two nitrogen species. The concentration of NH3 is 30 mg/L NH3, and the concentration of NO3 - is 5 mg/L NO3 - . What is the total nitrogen concentration in units of mg N/L? Correct Answer-25.8 mg N/L (Lecture 3-5) What pH is required to reduce a high concentration of dissolved Mg2+ to 43 mg/L? Ksp for the following reaction is 10-11.16. Mg(OH)2(s) Mg2+ + 2OH Ksp = 10-11.16 Correct Answer-Ph=9.79 (Lecture 3-5) How long will it take the carbon monoxide (CO) con...

Electron configuration for cations - Answer-Subtract 1 from exponent of highest n-value orbital (ex. remove from 4s before 3d) Ag+ = [Kr]5s^1 4d^9 Electron configuration for anions - Answer-Add 1 to closest orbital Cl- = [Ne]3s^2 3p^6 Atomic orbitals - Answer-s, p, d, f Primary vs secondary structures of proteins - Answer-Primary - AA chain (linked by peptide bonds) Secondary - stabilized by non-covalent bonds (alpha helices & beta sheets) Most bonds in organic compounds are - Answer-cov...

Which of the following is a surrogate test that is used to detect donors at high risk for transmitting transfusion-related disease? a) Нерatitis b) HIV c) CMV d)Malaria e) Syphilis - correct answer e) Syphilis Which of the following is a transfusion science test? a) AFP b) DAT c) NH4 d) retic e) CRP - correct answer b) DAT Which of the following items is NOT found in cryoprecipitate? a) Factor 1 b) Factor V c) Factor VIII d) Factor XII e) Fibrinoge...

By what process are LDL particles removed selectively from the blood serum? A. through targeted digestion by serum lipases B. by receptor-mediated endocytosis C. They are replenished with triacylglycerols and never removed. D. They form atherosclerotic plaques. correct answers by receptor-mediated endocytosis The sterol regulatory element (SRE) is a(n) __________ and the sterol regulatory element binding protein (SREBP) is a(n) __________. allosteric activator; enzyme transport activato...