II. DENSITYA. Our bones' density is a measure of their health and strength. Our bones are constantly gaining and losingcalcium, magnesium, and phosphate. In childhood, bones form at a faster rate than they break down. As weage, bone breakdown occurs more rapidly than new bone forms. As bone loss increases, bones begin to thin,causing a decrease in mass and density. Thinner bones lack strength, which increases the risk of fracture.Hormonal changes, disease, and certain medications can also contribute to the bone thinning. Eventually, acondition of severe bone thinning known as osteoporosis, may occur. Scanning electron micrographs (SEMS)show(a) normal bone And(b) bone withminerals.osteoporosis due to loss of boneBone density is often determined by passing low-dose X-rays through the narrow part at the top of the femur(hip) and the spine(c). These locations are where fractures are more likely to occur, especially as we age. Bones with highdensity will block more of the X-rays compared to bones that are less dense. The results of a bone densitytest are compared to a healthy young adult as well as to other people of the same age. Recommendationsto improve bone strength include calcium and vitamin D supplements. Weight-bearing exercise such aswalking and lifting weights can also improve muscle strength, which in turn increases bone strength.Problem:(1pt blood contains 473.2ml)Question: John has a blood volume of 4.8 qt. If the density of blood is 1.06 g/mL, what is themass,in grams, of John's blood?B. Consider two samples of palladium (Pd), an element used in automobile catalytic converters. Sample A is aCylindrical bar with a mass of 97.36 g. The bar is 10.7 cm high and has a radius of 4.91 mm. Sample B is anirregular solid with a mass of 49.20 g. A graduated cylinder has 10.00 mL of water. When sample B is added to thegraduated cylinder, the volume of the water and the solid is 14.09 mL. Calculate the density of each sample.

Question: John has a blood volume of 4.8 qt. If the density of blood is 1.06 g/mL, what is the mass, in grams, of John's blood? B. Consider two samples of palladium (Pd), an element used in automobile catalytic converters. Sample A is a Cylindrical bar with a mass of 97.36 g. The bar is 10.7 cm high and has a radius of 4.91 mm. Sample B is an irregular

Question: John has a blood volume of 4.8 qt. If the density of blood is 1.06 g/mL, what is the mass, in grams, of John's blood? B. Consider two samples of palladium (Pd), an element used in automobile catalytic converters. Sample A is a Cylindrical bar with a mass of 97.36 g. The bar is 10.7 cm high and has a radius of 4.91 mm. Sample B is an irregular

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Use the chart if needed A rock, weighing 41.3 g, is placed in a graduated cylinder containing 100.0 mL of water. The volume then reads120.3 mL. What is the density of the rock in g/cubic centimeters? A) 0.41 B) 0.49 C) 2.03 D) 0.34 The mass of the pycnometer with water is 38.5 g, while the mass of the pycnometer is 36.5 g. What is the mass of the water in the pycnometer? A) the mass of the water in the pycnometer can’t be determined B) the mass of the water in the pycnometer is 6 g C) the mass of the water in the pycnometer is 2 g D) the mass of the water in the pycnometer is 2.5 g
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