Latent Heat And Specific Heat Capacity Assignment

 Specific Heat Capacity

AIM To identify solids by measurement of specific heats.
THEORY
The specific heat capacity c of a substance is the amount of heat, Q which must be added to per unit mass the substance to raise its temperature by 1 K.

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c =Qequation 7
m  T

The specific heat of a substance may be found by the “method of mixtures”. A mass mm of the material is heated to a temperature TW contained in a calorimeter with stirrer (of same material) of mass mC and specific heat cC. The complete system is allowed to come to a final temperature Tf.
Now provided no heat is lost to the surroundings then the total heat for the system is
Q=0
Qm+Qw+ Qc=0
mm cm(T f Tm)+ mwcw(T f Tw)+ mc cc(T f Tc)=0                                               equation 8
Solving this equation for cm we have an expression for the specific heat capacity of the material

 

cm(mccc+mwcw )(TfTw)
=equation 9
mm(TmTf)

specific heat of water, CW = 4.18 x 103 J kg-1 K-1 specific heat of copper, CC = 0.38 x 103 J kg-1 K-1
PROCEDURE
Note NO error calculations are required in this part but ensure that a suitable number of significant figures are used.

  • Add enough tap water to the calorimeter so as to just cover the thermometer bulb (or temperature sensor) and weigh it. Determine the mass of water using the calorimeter mass determined in part A.
  • Record the temperature of calorimeter and water.
  • Quickly and carefully use tongs to transfer the first sample of heated metal to the calorimeter.
  • Stir the water and record the resulting maximum temperature.
  • Repeat steps 1 to 5 for the other metal samples using fresh water each time, and tabulate results.
  • Calculate cm for each of the pieces of metal and determine from the table below the type of metal.

TABLE OF SPECIFIC HEATS

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Materialc (J kg-1 K-1)
Copper380
Lead160
Aluminium900
Gold125
Magnesium980
Iron440
Stainless steel510
Brass368

Lab proforma and answers:
H8 – LATENT HEAT AND SPECIFIC HEAT CAPACITY
Student Name __________________________________________________________

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Student Number ________________________Date___ / ___ / _______
Partners Name(s)____________________________________________________
Assessment Criteria
Tables
1.0Clearly entered data values
1.0Correct units and multipliers in column/row headings
1.0Data quoted to an appropriate number of significant figures
____ / 3 marks
Graphs
1.0Informative graph titles
1.0Axes clearly labelled
1.0Correct axis units and multipliers stated
1.0Data plotted correctly
1.0Appropriate lines of best fit drawn
1.0_Appropriate uncertainty lines drawn
____ / 6 marks
Data Analysis
1.0Calculations clearly set out
1.0Correct formulae or relationships used
1.0Values consistent with data substituted correctly into formulae
1.0Realistic uncertainty values stated or calculated
1.0Uncertainty calculations clearly shown

____ / 5 marks
Learning Outcomes
2.0  Technique efficient and accurate
3.0  Answers to questions show understanding of concepts
1.0  Conclusions consistent with results and aims
____ / 6 marks
Total = _________ / 20                                            Demonstrator Sign: ____________________
H8 – LATENT HEAT AND SPECIFIC HEAT CAPACITY
RESULTS
Part B                  Specific Heat Capacity

  • Record your measurements in the table below. Use published data to identify each material in the final row.
123
Mass of Wooden Lid (g)30.930.9 30.9
    
Mass of Calorimeter, stirrer and lid (g)139.7139.7 139.7
    
Mass of Calorimeter and stirrer (g)80.580.5 80.5
    
Mass of Calorimeter, stirrer, lid and water (g)249.0242.7 242.2
    
Mass of Water (g)109.5102.9 102.5
    
Temperature of the Calorimeter and water (oC)22.322.1 22.1
    
Mass of material (g)8.633.3 30.7
    
Max Temp of water and calorimeter (oC)23.524.3 23.9
    
Specific Heat capacity of the material (JKg-1 K-1)891402 354
(show calculations below)    
MaterialAluminumCopper Brass
Show sample calculations for specific heat capacity (for one material) here

Specific heat of water, CW = 4180 J kg-1 K-1
Specific heat of copper, CC = 380 J kg-1 K-1
Mass of Calorimeter, stirrer and lid, MC = 80.5 g = 0.0805 Kg
Mass of Water, MW =109.5 g = 0.1095 Kg
Max Temp of water and calorimeter, TF = 23.5 oC
Temp of the calorimeter and water, TW = 22.3 oC
Mass of material, MM = 8.6 g = 0.0086 Kg
Temp of material, TM = 100 oC
Specific heat capacity of the material, CM= ?
JKg-1 K-1     Aluminum

Experimental Discussion

  • Your answers to any questions asked in the experimental instructions
  • Direct comparison of your final result(s) with accepted or published value(s) or trends
  • Identification of factors limiting reliability of measurements and results and any measures taken to increase this reliability.
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