This was also supported using a student's t-test. Overall, I feel this labexercise should be considered successful. Use this data to determine the temperature at the time of mixing using a trend line in a graphing software program. Please read for more information about how you can control adserving and the information collected. Experiment 1: Determination of Specific Heat of a Metal After completing the Procedure and Post-Lab equations, compare the specific heat of the unknown metal to a table containing values of specific heats for several metals in order to determine the identity of your metal.
Step 8: The copper sample was removed from the calorimeter, dried, and its massmeasured. However, distilled water is very pure and contains only watermolecules, the very reason it was used in this experiment. We are going to bring several objects of different temperature together. You need to build your immersion heater by winding the NiCr-wire around a pencil say 8 to 10 times. Most, like solar power and wind power, require certain weather conditions not common in many locations. I noticedthat the specific heat of H20 is quite large when compared to many other substancesused in chemistry. Laboratory January 14, 2013 B.
It does so because students use the specific heat equation to calculate the specific heat of an unknown metal. The constant variables are the voltage and current. Step 9: Using the percent error equation and the theoretical values of specific heat,determine the percent error for the copper sample tested and see how accurate wewere in our measurements during the lab. Also the temperature of the metal was close in numbers to some other possible metals which could possibly result in a mistake being made in the metal identified. To add to the accuarcy, each side of the cube is measured if it is a three-demensional square. Be careful to ensure that the thermometer is not touching the metal, only the water.
This is precisely why the public should consider other more efficient, abundant and cheaper fuels capable of giving off larger amounts of heat energy through combustion. The Einstein-Debye model of describes the low temperature behavior. When five minutes have passed, record the temperature of the water in your calorimeter in Table 2. Hold or secure the thermometer in place so that it is in the liquid but not touching the bottom of the cup. Heats of fusion or vaporization, heats of solution, and heats of reaction are examples of the kinds of determination that can be made in calorimetry.
Method: 1 Place a Joule heater in the 1Kg lead block and connect it to a power supply 2 Put a little bit of glycerol on the thermometer this makes the temperature reading more accurate and place it in the 1Kg lead block. All the necessary data are gained by measuring from the actual experiment. Table 6 — B : Determination the Specific Heat of Materials. Error is mostly due to heat loss in surroundings and variations in actual specific heats. Variables: The Dependent Variable is the temperature of the water, and since the Energy is calculated using temperature it is a dependent variable as well.
Since we know that heat energy is related to temperature change by: you can calculate the specific heat of the metal. Also different metals are made up from different material, so these made be one of the reasons for them to have different specific heats. Using the equations listed above, we were able to determine the specificheat capacity Cp of Copper. Research: In today's world, almost everything we do needs power from fossil fuels or waterfalls. Construct a table or a chart in which data could be properly labeled and read before conducting any measurements. Some possiblesources of error could have been in the thermometers not being accurately read, theheat lost to the air was not factored in, also possibly altering the results.
The relationship between heat and temperature changed is usually expected in the form shown. In this experiment, a weighed amount of copper is heated to a certaintemperature and then quickly placed into a calorimeter which contains a measuredamount of H20 at a known temperature. I told them that this water must be measured and the temperature of this water will be the initial temperature of the water. Step 4: As the temperature of the calorimeter and water eventually come to equilibrium,read and record this temperature; this was used as the initial temperature of the water. Hypothesis: Since all metals have different densities and makeups I think that the heat capacity will greatly vary. Calculate the average heat capacity of the unknown metal. Hayworth Research Question: Does the number of hydrocarbons that a fuel is composed of affect how much it will ignite? We also found that placental mammals had the highest oxygen consumption rates and marsupials had the lowest.
Conclusion~ First of all, calorimeter was not completely isolated and heat was lost also before the hot water was poured into calorimeter and the room temperature air-conditioned is the one which affects the values of our results. The research led to the understanding of a calorimeter, the answer to if density could identify a meatl, and charts of specific heat and density of different metals and alloys. In a Styrofoam cup, record the temperature of the 200 ml of cold water. Remember: the temperature changes for the metal block and the water are different! Adjust the voltage across the immersion heater around 12 to 15 volts. Wait until the temperature no longer rises thermal equilibrium , and record the temperature increase. Cookies are only used in the browser to improve user experience.