What is the identity of the piece of wood? The specific gravity of a patient\'s

Question

What is the identity of the piece of wood? The specific gravity of a patient's urine sample was measured to be 1.008. Given that the density of water is 1.000 g/mL at 4 degree C, what is the density of the urine sample? The density of grain alcohol is 0.789 g/mL. Given that the density of water at 4 degree C is 1.00 g/mL, what is the specific gravity of grain alcohol? The density of mercury is 13.6 g/mL. If a sample of mercury weighs 272 g, what is the volume of the sample in mL? You are given three bars of metal. Each is labeled with its identity (lead, uranium, platinum). The lead bar has a mass of 5.0 times 10^1 g and a volume of 6.36 cm^3. The uranium bar has a mass of 75 g and a volume of 3.97 cm^3. The platinum bar has a mass of 2140 g and a volume of 1.00 times 10^2 cm^3. Which of these metals has the lowest density? Which has the greatest density? Refer to Problem 1.131. Suppose that each of the bats had the same mass. How could you determine which bar had the lowest density or highest density?

Explanation / Answer

Q1.128

By definition, specific gravity = Density of sample / Density of water

so

S.G urine = 1.008

D water = 1 g/mL

so

D urine = S.G.*D = 1.008*1 = 1.008 g/mL

Q1.129

Similarly...

S.G. alcohol = D alcohol / D water = 0.789 g/mL / 1 g/mL = 0.789 g/mL

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