Heat Capacity of An Unknown Metal Purpose: The purpose of performing this lab was to find the specific heat capacity of an unknown metal. Hypothesis: Since all metals have different densities and makeups I think that the heat capacity will greatly vary. The makeup of iron is very different than aluminum so the heat capacity will be quite different. Also, a lot of metals are not completely pure and that will also have some effect on the heat capacity. Materials: -Hot Plate -Two (2) Beakers -Water -Metal Objects -Two (2) Thermometers -Pencil -Paper -Calculator Design: A hot plate is acquired and plugged in and if left to warm up. Fill two beakers with 0.075kg of water and record the temperature using a thermometer and record it. Place one of the beakers onto the hot plate and drop one of the metal objects in. Wait for the water to boil and wait two minutes. Take the object out of the water and drop it into the other beaker. Take the temperature of the beaker and record the rise in temperature. Repeat this exact process for how ever many objects you have to test. Procedure: 1. Plug in the hot plate 2. Fill two beakers with 0.075kg of water 3. Select your metal objects 4. Record the starting temperature of the water 5. Place a beaker onto the hot plate and drop a metal object in 6. Wait until the water boils and record the temperature to make sure that it is 100 degrees 7. Wait two minutes 8. Remove the metal object from the first beaker and insert it into the second one. 9. Record the change in temperature after the object has been placed into the water. 10. Repeat this exact process for how ever many objects you have to test. Observations: In this lab I observed that the temperature ... ... middle of paper ... ... possible was our thermometer that was used to measure the cold water temperature change. When it was set down for all of our experiments it was put near the hot plate which was making the counter quite hot. This could have given some skewed readings when it was used to measure the temperature. As stated in the hypothesis it was thought that all of the metals have a different makeup so the heat capacity was going to vary between metals. The findings in this lab prove this to be true. So if one is trying to determine what an unknown metal is made up of, this experiment would be an adequate solution. Once you find your values, compare them to a thermal conductivity chart and compare to find the metal. Based on the data collected throughout the lab, I can conclude that my hypothesis was correct. A metals heat capacity is determined by the makeup and density of a metal.
First, 100 mL of regular deionized water was measured using a 100 mL graduated cylinder. This water was then poured into the styrofoam cup that will be used to gather the hot water later. The water level was then marked using a pen on the inside of the cup. The water was then dumped out, and the cup was dried. Next, 100 mL of regular deionized water was measured using a 100 mL graduated cylinder, and the fish tank thermometer was placed in the water. Once the temperature was stabilizing in the graduated cylinder, the marked styrofoam cup was filled to the mark with hot water. Quickly, the temperature of the regular water was recorded immediately before it was poured into the styrofoam cup. The regular/hot water was mixed for a couple seconds, and the fish tank thermometer was then submerged into the water. After approximately 30 seconds, the temperature of the mixture leveled out, and was recorded. This was repeated three
The metal cylinder was removed from the boiling water and placed in the Styrofoam cup using tongs.
put in the pot. If the person knew if changing the volume of a substance will not change the boiling point, but only alter how much time it takes for the substance to reach the temperature. Then the person would know that it would be better to not put too much water in the pot, because it would take longer for the water to boil.
6. Place the test tube in the beaker. Secure the test tube and thermometer to the retort stand using clamps. Begin heating the water bath gently.
Aluminum is a lightweight, silvery metal. The atomic weight of aluminum is 26.9815; the element melts at 660° C (1220° F), boils at 2467° C (4473° F), and has a specific gravity of 2.7. Aluminum is a strongly electropositive metal and extremely reactive. In contact with air, aluminum rapidly becomes covered with a tough, transparent layer of aluminum oxide that resists further corrosive action. For this reason, materials made of aluminum do not tarnish or rust. The metal reduces many other metallic compounds to their base metals. For example, when thermite (a mixture of powdered iron oxide and aluminum) is heated, the aluminum rapidly removes the oxygen from the iron; the heat of the reaction is sufficient to melt the iron. This phenomenon is used in the thermite process for welding iron .
A thermometer * A clamp * A Bunsen burner * A stop clock Method = =
on how long it takes to heat up. If we heat a large volume of water it
water has risen to 60°c I will then put the lid on the spirit burner
Plan 1. Collect 4 different sized beakers 2. Boil some water in the kettle 3. Pour 50ml into each beaker 4. After 1 minute check temperature 5.
After the water, has been boiling for 10 minutes, and the temperature inside the test tube has been stable for 5 minutes, record the temperature and remove the thermometer.
Rinse your beaker thoroughly to wash any excess powder. 12. Repeat steps 7-11 3 more times for reliability. To make sure the temperature still stays hot by continue heating the water a little bit using the hot plate. 13.
In a 250ml beaker place 100mls of water, measure the temperature of the water and record this initial temperature onto a table. Set the timer and add one teaspoon of Ammonium Nitrate to the water, stir this continuously until the Ammonium Nitrate has dissolved. After 1 minute measure the temperature and record it, do this for a further 2 minutes (3 minutes in total). Repeat this process for a total of 10 teaspoons.
ball in the beaker. I heated it up to 50°C, when the ball was at the
By exposing the chocolate and the cookies before the light and heat of the 60-watt light bulb, the students will be able to progressively observe the process of the material melting and make records at every stage of the experiment. Using the 15 seconds step, the students can identify the melt temperature and time of the chocolate under the lab conditions as well as make and analyze their records in the final part of the experiment. The experiment is expected to establish, which of the chocolates and cookies melt faster, and make conclusions about the influence of the consumables ingredients on their physical properties. This corresponds with the TEK 112.11 (5B) procedure, which allows students to “observe, record, and discuss how materials can be changed by heating or
3. Why are the crucible and lid heated at the beginning of the experiment before being weighed?