A student was given the list of items below and was asked to determine density o

Question

A student was given the list of items below and was asked to determine density of at least one of them. The student chose the stone. He she weighed the stone by hanging it from a spring balance and found the weight to be 17.40 g. The stone was lowered into a graduate cylinder containing water, A(see below). The water was displaced as shown in B. What is the density of the stone? Water has a specific heat of 1 cal/gm degree C and iron has a specific heat of 0.107 cal/gm C. If we add the same amount of heat to equal masses of iron and water, which will have the larger change in temperature? You must show calculations in order to receive credit and select the correct answer below: The iron They will have equal changes since the same amount of heat is added to each. The Water, None of the above A student in chemistry 150-02 measured out 200 g of water at 95 degree C. The water has a specific heat of 1.00 ca/g C A 100 g piece of iron (specific heat of iron is 0.107cal/g degree C)at 35 degree C was added to the water at 95 degree C. What is the final temperature of the iron and water after mixing?

Explanation / Answer

Q1.

Density = mass / volume

mass of rock = 17.4 g

Volume = Volume displaced = Vfinal - Vinitial = 9.5-6 = 3.5 mL

so

D = 17.4/3.5

D = 4.97142 g/mL

Q2.

specific heat is nothing more than how much heat can a specie receive without changing temperature

so

Cp for iron is lower, meaning it requires lesss heat to change T

so larges dT will be iron

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