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Chapter 4 – Chemical Composition
Chapter 4 – Chemical Composition

... for us to see and manipulate. If you could count 1000 water molecules per second for slightly over 20 billion years, you would have counted the molecules in one small drop of water (about 0.020 mL). Instead, because we know the mass of one mole of any substance, we can carefully weigh out an amount ...
CHAPTER 3 STOICHIOMETRY OF FORMULAS AND EQUATIONS
CHAPTER 3 STOICHIOMETRY OF FORMULAS AND EQUATIONS

... © 2013 by McGraw-Hill Education. This is proprietary material solely for authorized instructor use. Not authorized for sale or distribution in any manner. This document may not be copied, scanned, duplicated, forwarded, distributed, or posted on a website, in whole or part. ...
Chapter 1
Chapter 1

... 1.49 A balanced chemical equation must have equal numbers of atoms of each element on each side of the arrow. Balance each element in turn, beginning with those that appear in only one reactant and product, by adjusting stoichiometric coefficients. Generally, H and O are balanced last. When balancin ...
Chapter 4 Solution Manual
Chapter 4 Solution Manual

... Plan: Compounds that are soluble in water tend to be ionic compounds or covalent compounds that have polar bonds. Many ionic compounds are soluble in water because the attractive force between the oppositely charged ions in an ionic compound are replaced with an attractive force between the polar wa ...
CHAPTER 3 MASS RELATIONSHIPS IN CHEMICAL REACTIONS
CHAPTER 3 MASS RELATIONSHIPS IN CHEMICAL REACTIONS

... Strategy: We are given grams of ethane and asked to solve for molecules of ethane. We cannot convert directly from grams ethane to molecules of ethane. What unit do we need to obtain first before we can convert to molecules? How should Avogadro's number be used here? Solution: To calculate number of ...
CHAPTER 3 MASS RELATIONSHIPS IN CHEMICAL REACTIONS
CHAPTER 3 MASS RELATIONSHIPS IN CHEMICAL REACTIONS

... Strategy: We are given grams of ethane and asked to solve for molecules of ethane. We cannot convert directly from grams ethane to molecules of ethane. What unit do we need to obtain first before we can convert to molecules? How should Avogadro's number be used here? Solution: To calculate number of ...
Chapter 4 - Chemistry
Chapter 4 - Chemistry

... Strategy: Hydrogen displacement: Any metal above hydrogen in the activity series will displace it from water or from an acid. Metals below hydrogen will not react with either water or an acid. Solution: Only (b) Li and (d) Ca are above hydrogen in the activity series, so they are the only metals in ...
Chapter 3 - Chemistry
Chapter 3 - Chemistry

... Strategy: We are asked to solve for the number of N, C, O, and H atoms in 1.68  104 g of urea. We cannot convert directly from grams urea to atoms. What unit do we need to obtain first before we can convert to atoms? How should Avogadro's number be used here? How many atoms of N, C, O, or H are in ...
CHAPTER 4 REACTIONS IN AQUEOUS SOLUTIONS
CHAPTER 4 REACTIONS IN AQUEOUS SOLUTIONS

... In order to work this problem, you need to assign the oxidation numbers to all the elements in the compounds. In each case oxygen has an oxidation number of −2 (rule 3). These oxidation numbers should then be compared to the range of possible oxidation numbers that each element can have. Molecular o ...
Stoichiometry
Stoichiometry

... Balanced chemical equations: for example, for a given mass of a reactant, calculate the amount of produced. Limiting reactants: calculate the amount of product formed when given the amounts of all the reactants present. The percent yield of a reaction. Reactions in solution: given the molarity a ...
Chapter 4 - Chemistry
Chapter 4 - Chemistry

... (a) is a strong electrolyte. The compound dissociates completely into ions in solution. (b) is a nonelectrolyte. The compound dissolves in water, but the molecules remain intact. (c) is a weak electrolyte. A small amount of the compound dissociates into ions in water. When NaCl dissolves in water it ...
Purification and Characterization of Chorismate
Purification and Characterization of Chorismate

... crude extracts of E. gracilis due to the presence of low molecular weight inhibitory material. To determine chorismate synthase activity in the crude extract, this material could be removed by gel filtration and it was lost during ammonium sulfate precipitation. Chorismate synthase activity eluted a ...
Moles Workbook
Moles Workbook

... We can picture the hydrogen atom - the simplest of all atoms with one electron, and one proton in the nucleus - by considering a pea placed in the centre of a football pitch, to represent the nucleus with its proton. On this scale the electron will revolve in a circular orbit round the goal posts. B ...
CHAPTER 3 STOICHIOMETRY
CHAPTER 3 STOICHIOMETRY

... Solution: Let's first calculate the number of N atoms in 1.68  10 g of urea. First, we must convert grams of urea to number of molecules of urea. This calculation is similar to Problem 3.26. The molecular formula of urea shows there are two N atoms in one urea molecule, which will allow us to conve ...
1 Ag PO 7.5 10 1.79 10 418.57 mol x gL x M g
1 Ag PO 7.5 10 1.79 10 418.57 mol x gL x M g

... Silver chloride is an insoluble solid. However, any Ag+ ions present react with added NH3 to form the Ag(NH3)2+ complex ion. According to Le Châtelier’s Principle, as NH3 is added to a solution containing Ag+ ions, the complex ion forms using up the Ag+ ions. This disrupts the equilibrium and forces ...
volume 2 - PianetaChimica
volume 2 - PianetaChimica

... numeric results in the original solutions showed to be obviously not correct. Although the numbers of significant figures in the results of several solutions do not obey the criteria generally accepted, they were left without change. ...
Sample Chapter 3
Sample Chapter 3

... much as 1 NaCl formula unit, and 1 mol of H2O weighs 18.02/58.44 as much as 1 mol of NaCl. The two key points to remember about the importance of the mole unit are • The mole lets us relate the number of entities to the mass of a sample of those entities. • The mole maintains the same numerical rela ...
Stoichiometry - Normal Community High School Chemistry
Stoichiometry - Normal Community High School Chemistry

... Balanced chemical equations: for example, for a given mass of a reactant, calculate the amount of produced. Limiting reactants: calculate the amount of product formed when given the amounts of all the reactants present. The percent yield of a reaction. Reactions in solution: given the molarity a ...
volume 2 - HotNews
volume 2 - HotNews

... numeric results in the original solutions showed to be obviously not correct. Although the numbers of significant figures in the results of several solutions do not obey the criteria generally accepted, they were left without change. ...
chapter 5 gases and the kinetic
chapter 5 gases and the kinetic

... Plan: To find the mass of PH3, write the balanced equation, convert mass of P4 to moles, solve for moles of H2 using the standard molar volume (or use ideal gas equation), and proceed with the limiting reactant problem. Solution: P4(s) + 6 H2(g) → 4 PH3(g) Moles hydrogen = (83.0 L) (1 mol / 22.4 L) ...
PDF
PDF

... amounts of zinc acetate and/or acetic acid that were present from the neutralization step in the preparation of the ionomer. Two-dimensional X-ray diffraction patterns for the blends revealed that chain-packing within nanoparticles was different than that of the LCP or the homopolymers prepared from ...
Chapter 4
Chapter 4

... (a) is a strong electrolyte. The compound dissociates completely into ions in solution. (b) is a nonelectrolyte. The compound dissolves in water, but the molecules remain intact. (c) is a weak electrolyte. A small amount of the compound dissociates into ions in water. When NaCl dissolves in water it ...
Answers to Problem-Solving Practice Problems
Answers to Problem-Solving Practice Problems

... (4) Check your answer: Because the density is a little less than 1.00 g/mL, the volume in milliliters should be a little larger than the mass in grams. The calculated answer, 4.92 mL, is a little larger than the mass, 4.33 g. 1.2 Substance A must be a mixture since some of it dissolves and some, sub ...
chapter 5 gases
chapter 5 gases

... Measure the conductance to see if the solution carries an electrical current. If the solution is conducting, then you can determine whether the solution is a strong or weak electrolyte by comparing its conductance with that of a known strong electrolyte. Since HCl dissolved in water conducts electri ...
CHAPTER 4 REACTIONS IN AQUEOUS SOLUTIONS
CHAPTER 4 REACTIONS IN AQUEOUS SOLUTIONS

... Measure the conductance to see if the solution carries an electrical current. If the solution is conducting, then you can determine whether the solution is a strong or weak electrolyte by comparing its conductance with that of a known strong electrolyte. ...
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Size-exclusion chromatography



Size-exclusion chromatography (SEC) is a chromatographic method in which molecules in solution are separated by their size, and in some cases molecular weight. It is usually applied to large molecules or macromolecular complexes such as proteins and industrial polymers. Typically, when an aqueous solution is used to transport the sample through the column, the technique is known as gel-filtration chromatography, versus the name gel permeation chromatography, which is used when an organic solvent is used as a mobile phase. SEC is a widely used polymer characterization method because of its ability to provide good molar mass distribution (Mw) results for polymers.
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