Question

need answer to number 7

8.93 On the grid below, make a graph of density vs. 4. Cu. The graph should include the following points: density of pure Cu at 100% Cu and density of pure Za at 016 Cu. Draw a straight line connecting these 2 points. In order to determine an estimate of the composition of the brass simply find the density of the brass on the y-axis and find the copper on the x-axis that corresponds to this point on the straight line you have drawn. or on the x-axis the simply tina points. In and density of pho brass unknown (identifyy: 1.900/mL % copper in brass sample: 107 0 H 100% CO 9 w 70% Cuin HIITID bars 6. 1 2 20 40 50 76 FOTO 100 Zinc has a higher molar mass (and thus a higher atomic mass) than copper Yet copper has a higher density. Speculate on the reason for this seeming incongruity? The answer is not as difficult as you might think at first. Copper has a higher density because it has a greater mass thain zinc.com 7. What are the assumptions about brass that are made when using the density of brass to determine its % composition? List at least two and explain how they are related to the answer you found for the copper in your alloy. (i.e. If the assumption is wrong would it cause the % copper to be too high or too low?)

the graph has nothing to do with the quedtion its a critial thinking question

Answer 1

solution to Density is defined as mass upon volume. As mass increases, density also increases but copper has high density than zince it only when the volume of copper is less than that of zinco for a given mass. This is because the sparung because the spacing byw the copper atoms is less in copper anometal as compared to that of since morale