Calorimetry 1 The purpose of this experiment is to identify the mystery metal given to us (metal A). We are going to identify the mystery metal by looking at both its physical properties as well as its heat capacity. The heat capacity of the metal will be calculated using a setup/method described below. We will also look at the physical properties of the metal such as its magnetic properties, density, whether it is lustrous or dull, etc. by observation. Our mystery metal is not very lustrous and non-magnetic as it is not attracted to or repelled by the permanent magnet. We also measured the mass and dimensions of the mystery cylindrical metal. The metal has a radius of 1.05cm and a height of 3.2cm, while it has a mass of 79.7grams ± 0.5g. …show more content…
This can have significant effect since the thermal conductivity of metals are much higher than that of water. The heat dissipating from the hot metal will most likely be conducted by the metal surrounding the insulator due to a higher thermal conductivity. By elevating the metal via the string and the retort stand we can minimise the effects since the metal won’t be touching the bottom of the insulating container and be entirely surrounded by water. Another source of error would be the transferring of the mystery metal from the hot water to the insulating container. While transferring the mystery metal there were a lot of droplets of water that would be extra mass of water placed in the calorimeter that wasn't accounted for. This would effects our results when carrying out calculations to determine specific heat capacity. To overcome this error, we would have to quickly dry the metal but ensuring that the temperature cooling is small that has negligible effects. Biggest source of error in calorimetry experiments is that heat dissipates to the surrounding area, this could be while transferring the hot metal or during the actual transfer of heat energy from the metal to the …show more content…
This metal is Zinc. Zinc has the same physical properties as our mystery metal; it is non-magnetic and it is not lustrous. Zinc has a heat capacity of 376.812 J/kg-Co[1] which is well within the range of uncertainty of our specific heat capacity of (395.0141332 J/Kg Co ± 99.03469293 J/Kg Co). We calculated the percentage deviation; [Abs (395.0141332 J/Kg C - 376.812 J/kg-Co[1] ) / (99.03469293 J/Kg Co)]*100 = 18.37955232%, and it is 18. 38%, which is small enough for us to consider Zinc as our mystery metal. At the same the density of Zinc is 7.140[2] g/cm3, and again this value falls within our uncertainty range as the calculated density is 7.190844084g/cm3 ± 0.1072655086g/cm3. The percentage deviation of the density is 47.40021741%, as this deviation is less than 100%, it is safe to say that zinc on the bases of density could be our mystery metal. As zinc’s physical properties match that of our mystery metal and both its heat capacity and density values fall within our calculated values, we can confidently conclude that Zinc is our mystery
The purpose of the lab is to acquire the percent composition of zinc and copper. The procedure included obtaining a post 1983 penny and washing it with soap and water. Using a triangular file, we made an X on the penny. Then, we cleaned the top and bottom of the penny with steel wool until it was shiny. We rinsed the penny in acetone and dried it with paper towel.
Deductive reasoning was used by determining the identity of an unknown copper mineral by looking at different possible copper minerals in the database with observations that were taken throughout the entire lab. Through roasting, the percentage of mass could be found through the mass of copper contained in an unknown copper containing mineral sample by gravimetric analysis of the copper (II) oxide produced. Through the idea of smelting and spectroscopy the identity of the unknown copper could be found through careful calculations and analysis of the lab.
The goal of this experiment is to find out what is the identity of the unknown hydrate? To answer this question first, we should know what a hydrate, and how to identify a hydrate using the law of constant proportions. A hydrate is a pure substance because it contains water molecules embedded in its crystal structure that does not vary. By heating the unknown hydrate, we can calculate the mass of the hydrated, and the percentage of water in the hydrate.
METHOD: The following procedure was taken from the 2017 Millsaps College lab manual.1 The experiment was split into two parts, part A and part B. Part A was to find the heat capacity while part B determined the specific heat of an unknown metal. This was the final goal of the lab. To start, a temperature probe had to be connected to a LabQuest2 data collection device. 100.0 mL of deionized had to be added into a Styrofoam cup.
The Controlled Variable for this experiment was mass and volume. When identifying an unidentified object finding the density is the easiest way to do it because, any pure substance has a specific density at a specific temperature and each element and compound has a unique density associated
Rocks are intriguing to many individuals all over the world. Being made up of one or even many minerals, rocks draw an overwhelming amount of attention to themselves. When a probe brought back samples of rock from Planet X the task of identifying the rock was assigned. With no prior knowledge of the type of rock presented one will need figure out the identity of the rock based only on its density and physical properties. With an experimental process, one will begin to compare and uncover the identity of the rock samples brought back.
Thermochemistry What is the specific heat of platinum if 1092 J of heat were released into a calorimeter when it was cooled by 65.2 C A 185 g sample of copper at 98.0 C was added to 102 g of water at 20.0 C in a calorimeter. The final temperature of the copper-water mixture was 31.2C. Calculate the specific heat of copper using this data. How much heat in kJ is required to raise the temperature of 250.0 g of Hg 52.0 C? the heat capacity of Hg is 0.14 J/gC.
According to the observations recorded, the metal ion Cesium is present in the “unknown samples”. Unknown sample number five produced a violet color when placed in the flame. Unknown sample number four produced an orange color when placed in the flame. Unknown sample number one produced a violet color when placed in the flame. This evidence supports the claim that the metal ion Cesium is present in the unknown samples according to table two, the Flame Spectra of the Alkali and Alkaline-Earth Elements.
We calculated the density of the metal ball to be 7.83 g/cm3 using methods IV and V and concluded it was iron. C. The density of the plate was calculated to be 2.667 g/cm3 using methods IV and V. Thus we concluded that it was aluminum. 3.
Description Pennies have undergone design and composition changes over the years. Just like pennies have several versions, atoms of elements also have different versions of each other called isotopes. In this lesson, we will learn how to find the average atomic mass of the elements from its isotopes. !!! Average Atomic Mass Have you ever gone through a whole bag of multi-colored M&M’s?
In this week’s lab we had to determine the density of a quarter, penny, and dime. My question was “How does is each coin?” Density is the amount of mass in an object. To find the density of each coin in this lab, we used a triple beam balance to find each coin’s mass and a graduated cylinder to find their volumes. With all this information, I can now form a hypothesis.
From this graph there is a clear difference in the mass of the pennies depending on their year of manufactoring. We can see that there is a clear decrease in mass in the early 1980’s. Since we were not able to collect data for pennies manufactured for the years 1980, 1981, or 1982 in our random stack, it is clear there was a change in the mass of the pennies between in a year between 1980-1983. Even though there is slight variation between the two definite groups of the mass in the pennies, the small differences could have been from external factors explained in the errors section. 4.)
Today, however, the penny consists of ninety-seven and a half percent zinc with only a thin copper skin. Copper holds the third spot in most consumed industrial metals, according to U.S Geological Survey. In fact, electrical wires, telecommunication cables and electronics make up three-quarters of copper. Besides gold, copper is the the only other element that is not naturally silver/grey. Today, about two thirds of copper comes from is found in volcanic rocks.
The purpose of this lab was to change pennies from copper to silver to gold, like alchemists have attempted to do in history. Through the data and observations gathered throughout this experiment, it can be concluded that the pennies were not changed into a different element. For example, the density of the penny from 2005; which was the penny that was experimented on to see whether or not it could turn into silver; was 4.62 g/cm3 before the experiment and 4.89 g/cm3 by the end of the experiment. If this copper penny really would have turned into silver, then the density of the penny would be 10.49 g/cm3; which is the density of silver; by the end of the experiment. The penny may have turned silver in color, but this was only because it was plated in the zinc that was added to the beaker of water in the experiment.
This coil has an electrical resistor which resists the flow of electricity, which in effect converts electrical energy into heat as energy goes through the coil. Due to this, the heat energy produced by the resistor heats up the water within the kettle to boiling point. The heating element is controlled by a bimetallic thermostat, which contains a variable resistor inside it. Integrated at the bottom of the kettle, it consists of a disc of two different metals bonded tightly together, curved in a particular direction. As temperature inside the kettle rises, one metal expands faster than the other, set up in a manner