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# Need help with the following lab questions please.  Please be sure...

Need help with the following lab questions please.  Please be sure to answer all parts of each question.

2. Using the heat capacity value that you determined in part II of the lab (attached) , what is the most probably identity of the metal that you examined? Please explain your reasoning in complete sentences.

3. Based on your answer in question 2, determine the percent error of your calculated specific heat capacity value of your unknown metal using the specific heat capacities of known metals below.

Percent Error = experimental value – actual value x 100

actual value

 Metal Specific Heat Capacity Nickel 0.440 Tin 0.210 Silver 0.237 Magnesium 0.140 Calcium 0.650 Mercury 0.140

Metal you examined:

• Experimental specific heat capacity:
• Metal identity:
• Known specific heat capacity value:
• Percent error (Show ALL work):

1 Attachment
Part II Data and Observations: Initial temperature of hot metal: 100 °C Volume of water in calorimeter: 24 ml Initial temperature of water in calorimeter: 25 °C Unknown Letter (A, B, or C): A Mass of metal: 25.605 Final Temperature in calorimeter: 29.1 °C Part II Calculations: 1. Calculate the energy change (q) of the surroundings (water). We can assume that the specific heat capacity of water is 4.18 J/ (g · °C), and the density of water is 1.00 g/mL. q = m × c × Δt (Use values for water) m = 24 ml c=4.18 Δt = 29.1 – 25 = 4.1 24 * 4.18 *4.1 = 411.31 joules 2. Calculate the specific heat of the metal. q surroundings = - q system q = m × c × Δt c = q metal / (mass metal * temp change of metal) c=Q/m*temp change Q=411 joules m=25.61g Δt =100-29.1=70.1 c=411/(25.61 *70.1) c=411/1697 c=0.242 J kg -1o C
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