Chemistry, 02.09.2019 19:00 deanlmartin

A50.00 g sample of an unknown metal is heated to 45.00°c. it is then placed in a coffee-cup calorimeter filled with water. the calorimeter and the water have a combined mass of 250.0 g and an overall specific heat of 1.035 cal/g•°c. the initial temperature of the calorimeter is 10.00°c. the system reaches a final temperature of 11.08°c when the metal is added.

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Answer from: maya4321

First, in order to calculate the specific heat capacity of the metal in help in identifying it, we must find the heat absorbed by the calorimeter using:
Energy = mass * specific heat capacity * change in temperature
Q = 250 * 1.035 * (11.08 - 10)
Q = 279.45 cal/g

Next, we use the same formula for the metal as the heat absorbed by the calorimeter is equal to the heal released by the metal.

-279.45 = 50 * c * (11.08 - 45) [minus sign added as energy released]
c = 0.165

The specific heat capacity of the metal is 0.165 cal/gC

Answer from: juan2730

The specific heat capacity of the unknown metal has been 0.164 cal/g. $\rm ^\circ C$ .

Specific heat can be defined as the amount of energy required to raise the temperature of 1 gram of a substance by 1 degree celsius.

The expression can be given as:

heat = mass $\times$ specific heat capacity $\times$ change in temperature

The heat absorbed by Calorimeter can be given as:

Heat absorbed = 250 grams $\times$ 1.035 cal/g. $\rm ^\circ C$ $\times$ (11.08 $\rm ^\circ C$ - 10.00 $\rm ^\circ C$ )

Heat absorbed by calorimeter = 250 $\times$ 1.035 $\times$ 1.08

Heat absorbed by calorimeter = 279.45 cal

The heat absorbed by calorimeter has been equal to the heat released by metal.

Heat released by metal = 279.45 cal

Heat released = mass $\times$ specific heat capacity $\times$ change in temperature

279.45 cal = 50 g $\times$ specific heat capacity $\times$ (11.08 $\rm ^\circ C$ - 45.0 $\rm ^\circ C$ )

279.45 = 50 $\times$ specific heat capacity $\times$ -33.92

Specific heat capacity = 0.164 cal/g. $\rm ^\circ C$ .

The specific heat capacity of the unknown metal has been 0.164 cal/g. $\rm ^\circ C$ .

For more information about the specific heat capacity, refer to the link:

link

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

the answer is c.) 1575 j.

explanation:

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A50.00 g sample of an unknown metal is heated to 45.00°c. it is then placed in a coffee-cup calorime...

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