Academic Honesty Pledge I understand that students are expected to refrain from all forms of academic dishonesty as defined in the college policies and as explained and defined by college policies and procedures and directions from teachers or other college personnel. By signing this cover page I am confirming that the work presented here, including all the figures, tables, calculations, data and text, is mine and mine only. I hereby state that all work submitted in this report is mine and solely mine. Signature: Note: Only reports that include a signed cover sheet will be graded. 1 2 3 Objective of Evaluation Report presentation (must be typed) Observation and Analysis (Part I) Observation and Analysis (Part II) Total HCT PHY1203 PHYSICS II LAB 1 202210 Max. marks 5 65 30 100 Marks obtained 1 Objective: To determine the specific heat of a solid body. Background The specific heat of a substance is the quantity of heat necessary to raise a unit mass of the substance by a unit temperature difference. When a heat interchange takes place between two bodies initially at different temperatures, the quantity of heat lost by the hot body is equal to that gained by the cold body, and some intermediate equilibrium temperature is finally reached. This is true provided no heat is gained from or lost to the surroundings. In this case, we can apply the principle of conservation of energy. Heat lost by hot body = Heat gained by cold body Experimental setup and theory In this experiment, a solid sample of known mass (ml) is heated to a certain temperature near the boiling point of water (Ts). It is then quickly transferred to a calorimeter of known mass (mcal), which contains cold water of known temperature (Tw) and mass (mw). It should be assumed that temperature of calorimeter is the same as (Tw). When the solid sample and the calorimeter (including water) come to thermal equilibrium, the final temperature (T;) is noted. It is assumed that the heat loss to the thermometer is negligible and if the heat exchange with the environment is kept small, then the heat lost by the solid sample (-Qsol) is equal to the total heat gained by the calorimeter (Qcal) and the water (Qw). Thus, applying the principle of conservation of energy to our isolated system (the net heat gained by the system is zero): Q=mcAT Qw-Q sol+Qcal=0 W mwcw T-Tw-m sol sol Tsol-Tf+m calcat (T-Tw=0 W f W C sol mwcw Tf-Tw+mcal Ccal Tf-Tw W msol (Tsol-Tr If we ignore the heat gained by the calorimeter, the equation becomes: mw Cw Tf - Tw W C sol m sol T % error= sol Calculate the percentage error in experimental value - accepted value accepted value HCT PHY1203 PHYSICS II LAB 1 202210 × 100 (3) (1) (2) (5) (4) (6) 2 Apparatus: 0 0 0 0 0 000 Calorimeter Stirrer Thermometer Hotplate Metal sample Water Weighing scale Measuring cylinder Figure 1: Simulation of the specific heat capacity Experiment Experiment Step 5 300mL 200mL Run Demonstration 100ml LIQUIDS SOLIDS SOLUTIONS Unknown metal I Procedure and implementation 1. Follow the simulation link given below. Mass (g) Temp (°C) Show specific heat (J/g°C) 0.388 Overview Learning Outcomes Experiment Please choose one: HCT PHY1203 PHYSICS II LAB 1 202210 12.5 100. 20.92°C Run Experiment -600mL 500mL 400mL 300mL 200mL 100mL LIQUIDS Water - H₂O SOLIDS SOLUTIONS Mass (g) Temp (°C) XShow specific heat (J/g°C) 4.184 _chem/chem_sim/calorimetry/Calor.php 2. Click experiment and then run the experiment, as shown below. Chemistry Simulations: Calorimetry Click here 100. 20.0 RUN EXPERIMENT Then click here Show graph view Show microscopic view Replay 3. Then click on the solid and choose unknown metal 1. Also fix the mass of the solid (ms) and the temperature of the solid (Tl) to record in the table 1. This temperature is the initial temperature of the solid (Tsol). 4. Then click next to choose the liquid. Select water and fix the mass of the water (mw). Reset 3 5. Record the fixed initial temperature of the water (Tw) at around 20 °C. 6. Now click 'next' to run the experiment and wait until the system reaches to thermal equilibrium and record this temperature as the final temperature (T₁) Observation and Analysis (Part I) (20 marks) Enter your measurements into the following table. Remember to enter the correct units. Mass (…............ ..) Specific Heat c (J/g °C) Initial temperature T (…….........…... ..) Final temperature (............ ..) Metal Water 4.186 Table 1: Data collected with the metal, water and calorimeter. HCT PHY1203 PHYSICS II LAB 1 202210 1) Insert the screen shot of the system when it reaches the thermal equilibrium. marks) (5 2) Using equation (5), (considering only the water and metal), calculate the specific heat of the metal (ignore the heat loss due to calorimetry). You must show sufficient working to score full credit. (10 marks) 4 3) Determine which of the metals listed in the table (in appendix) has been used in this experiment. Give a justification for your choice. (5 marks) 4) Using equation (6), calculate the percentage error between the calculated value (in table 1 above) and the theoretical value of the specific heat of the solid metal used (refer to appendix). (5 marks) 5) Now use the same simulation link above and choose unknown metal 2 to enter your measurements into the following table. Remember to enter the correct units. marks) (20 Mass (…............ ..) Specific Heat c (J/g °C) Initial temperature T (.............….....) Final temperature (…....….... HCT PHY1203 PHYSICS II LAB 1 202210 .) Metal Water 4.186 5

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