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Textbook Solution:


Answer:


Interpretation Introduction

Interpretation:

In the column chromatography, the use of Teflon or ungreased stopcock instead of a greased stopcock on the column needs to be explained.

Concept Introduction :

Chromatography is a versatile method of separationextensively used to get pure compounds from mixtures.

Explanation

In the column chromatography, the eluted components of the solute mixture are collected in separate containers as they come out from the bottom of the column.

If greased stopcock is used instead of Teflon or ungreased stopcock, the organic solvents used as eluants might dissolve some grease and pure components can get contaminated. Also, the solute components might get adsorbed on the greased stopcock decreasing the yield.

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QUESTION 6 (a) The bar shown in Figure Q2(a) is subjected to tensile load of 150 Kn. If the stress in the middle portions is limited to 160 N/mm², determine the diameter of the middle portion. Find also the length of the middle portion if the total elongation of the bar is to be 0.25 mm. E E = 2.0 + 105N/mm². (12 marks) 150 KN 10 cm DIA 10 cm DIA 150 KN 45 cm Figure Q6(a) (b) A brass bar, having cross-section area of 900 mm², is subjected to axial forces as shown in Figure Q2(b), in which AB = 0.6 m, BC = 0.8 m, and CD = 1.0 m. Find the total elongation of the bar. E = 1.0 + 105N/mm2 . (8 marks) Page 4 of 5 B D 40 KN 70 KN 20 KN 10 KN Figure Q6(b) (TOTAL = 20 MARKS)

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  Introduction To find incremental revenue and cost, we subtract Current revenue and cost from Projected revenue and cost. Answer Current Situation Projected Sales and Profit Incremental Revenues and Costs Total Revenue Php1,500,000 Php1,800,000 + Php3000,000 Variable Cost 575,000 425,000 - Php 332,000 Direct Fixed Costs 625,000 700,000 + Php 75,000 Indirect Fixed Costs 100,000 100,000 No change Profit Php 200,000 Php 575,000 + Php 375,000 Profit increases by Php 375,000, thus a new camera and coffee maker must be purchased.

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