ANS_EX_6 - Swieter P 1 OF 5 CHM1040 Answer to Exercise Set...

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Swieter; P 1 OF 5 X:\~Natsci\ADJUNCT\bhaskar\pdf\1041\ANS_EX#6.DOC CHM1040 Answer to Exercise Set 6 QUESTIONS INVOLVING SOLUTIONS 1. The liquid state is usually the easiest state in which to carry out reactions. Physical State Advantages Disadvantages Gas Particles in rapid motion. Gases occupy large volumes. Therefore, particle mix Special container needed to and react rapidly. contain gases. Solid Solids occupy small volumes. Particle movement nearly absent. No special container needed. Therefore, reaction very slow. Liquid Particles in motion. ???????? Therefore, particles mix and react reasonably fast. Volumes occupied by liquids are almost as small as solids. No special equipment needed. 2. A solution is defined as a homogeneous mixture . This definition does not specify the physical state. T herefore, a solution may be a solid, liquid or a gas mixture (as long as it is homogeneous). 3. The two components of a solution are the solvent and the solute. The distinction between them is arbitrary. The distinction is often based on the relative amounts of the two components with the solvent being present in a larger amount. Sometimes, the difference is based on the final physical state of the mixture. For example, if one of the components is a solid and the other a liquid then the distinction is made based on the state of the mixture. If the mixture is a liquid then the solvent is considered to be the iquid. If the mix is a solid then the solid is the solvent. l 4. Reactions are generally carried out in the liquid state for the advantages listed in problem 1. If one or more of the reactants are gases or solids, they are converted into a liquid solution by dissolving them into a liquid solvent. 5. Since chemicals combine by number and not by mass it follows that one would wish to determine the moles of the various reactants present in the reaction. Furthermore, since the most convenient property to measure for a liquid is volume (see reasons for using liquid solutions above), it follows that one would need a conversion factor to convert between the volume of liquid used and the moles of solute dissolved in the solution. Therefore, molarity (M) is the most convenient concentration unit for chemists. 6. Molarity (M) = Moles of solute/Liter of solution, mols/L 7. 8.
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Swieter; P 2 OF 5 X:\~Natsci\ADJUNCT\bhaskar\pdf\1041\ANS_EX#6.DOC 9. 10. The classification of a sample as ionic or molecular is not always easy . It is often done through a series of observations. The first step is to determine the physical state of the pure substance. If the pure substance is a gas or liquid under normal laboratory conditions, then this is considered as proof that it is a molecular compound. However, if it is a solid, the sample can still be either ionic or molecular. At this point the chemist usually resorts to conductivity measurements. If the sample is soluble in water and the resulting solution does not conduct, this is evidence that it is molecular. If the sample does
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This note was uploaded on 12/11/2011 for the course CHM 1045 taught by Professor Staff during the Spring '10 term at Santa Fe College.

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ANS_EX_6 - Swieter P 1 OF 5 CHM1040 Answer to Exercise Set...

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