In this lab, we found the Heat of Vaporization of liquid nitrogen, supported by the data we obtained. First, we calculated the amount of heat absorbed by the 60.00 g of liquid nitrogen we received. To do so, we had to add the liquid nitrogen to a Styrofoam cup containing hot water at 54.3 °C. We took the temperature of the water and nitrogen until it got to its lowest point, 20.2 °C. The water decreased by 31.5 °C after the liquid nitrogen vaporized. The mass decreased as well. After, we found the amount of heat the cup and water released to be 11,400 J, and the measured heat of vaporization to be 191 J/g or 45.6 cals./g. After, we compared this new heat of vaporization with the theoretical value of 199.9 J/g and attained a low negative percent error of -4.5%. In conclusion, this lab experiment was a success. We …show more content…
This warm air entering the cup would increase the temperature of the nitrogen. Temperature is the same as the average kinetic energy, therefore when the average kinetic energy of the nitrogen in this lab came in contact with the air, its molecules began to speed up, increasing the rate of vaporization. This means that some amount of liquid nitrogen vaporized, leaving less in the cup with the water. This would in turn, make the water not reach the lowest temperature that it should have reached because the water and the cup didn’t have as much nitrogen energy to consume. This would make the joules of heat released less, as well as the heat of vaporization values I obtained lower than the theoretical ones. Since the measured heat of vaporization was less than the accepted one, it caused my percent error to be negative. My second unique error has to do with the vaporization of the liquid nitrogen. Once the nitrogen leaves the storage vacuum tank, it begins to boil or vaporize. To accurately calculate the results for this lab, all of the liquid nitrogen we assume, stayed within the cup to cool the
Thermodynamics is essentially how heat energy transfers from one substance to another. In “Joe Science vs. the Water Heater,” the temperature of water in a water heater must be found without measuring the water directly from the water heater. This problem was translated to the lab by providing heated water, fish bowl thermometers, styrofoam cups, and all other instruments found in the lab. The thermometer only reaches 45 degrees celsius; therefore, thermodynamic equations need to be applied in order to find the original temperature of the hot water. We also had access to deionized water that was approximately room temperature.
The purpose of this lab was to calculate the specific heat of a metal cylinder
The data which was collected in Procedure A was able to produce a relatively straight line. Even though this did have few straying points, there was a positive correlation. This lab was able to support Newton’s Law of Heating and Cooling.
Evaluation I think that the method used in the experiment is not very accurate because the way we measure the amount of gas produced is not very
Repeat step 4 after another minute continue this for 5 minutes Beaker Start 1 2 3 4 5 Temperature change 1 59°c 57°c 56°c 55°c 52°c 50°c -9°c 2 72°c 71°c 66 °c 63°c 60°c 57°c -15°c 3 86°c 71°c 64°c 58°c 56°c 52°c -34° c 4 72°c 68°c 65°c 60°c 57°c 53°c -19°c Main Investigation ------------------ Aim To find out weather a beaker with a larger surface area cools quicker than one with a smaller surface area. Fair test To make it a fair test we will keep the following the same: Colour of tin - we will use clear beakers Amount of water - we will use 100ml
The porpoise of these is to determine the Specific Heat. Also known as Heat Capacity, the specific heat is the amount of the Heat Per Unit mass required to raise the temperature by one degree Celsius. The relationship between heat and temperature changed is usually expected in the form shown. The relationship does not apply if a phase change is encountered because the heat added or removed during a phase change does not change the temperature.
heat will stay in the cup and can only escape by rising to the surface
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.
Introduction: Respiration, commonly known as the inhalation, exhaling or breathing, has a little known definition. This is the definition that involves the cellular level of eukaryotic cells. Cellular respiration may best be described by the following equation: C6h1206+602-6CO2+6H20+36ATP. ATP is the energy needed for a cell to function as part of cellular respiration. ATP is needed to power the cell processes.
In a 100ml beaker 30mls of water was placed the temperature of the water was recorded. 1 teaspoon of Ammonium Nitrate was added to the water and stirred until dissolved. The temperature was then recorded again. This was to see the difference between the initial temperature and the final temperature.
It is based on physics, and the 2nd law of thermodynamics. A liquid is vaporized through compression, which requires kinetic energy. This draws the energy needed from the direct area; causing a loss in energy and then it
Also, when we put the insulation cans in warn water the water heated up the can. And lastly, in the insulated can experiments, both cooling and heating, when the cans temperature was changed it in turn changed the air temperature
Gases take one form of physical appearance for substances. By definition, a gas represents a grouping of molecules at a high energy such that the volume it occupies is determined by container, and can be molded and compressed into smaller packages via reduction of energy. Manipulating energy is the gases results into a change in form and physical appearance, which engages various phases from solid, liquid and gas. In the gaseous form the pressure (P), volume (V), absolute temperature of the gas (T), molar gas constant (R) and the number of moles (n) are the factors that can be manipulated to derive various characteristics of the gas to establish a relationship between the characteristic of the gas (Castka, Metcalfe, Davis, & Williams, 2002).
Heat energy is transferred through three ways- conduction, convection and radiation. All three are able to transfer heat from one place to another based off of different principles however, are all three are connected by the physics of heat. Let’s start with heat- what exactly is heat? We can understand heat by knowing that “heat is a thermal energy that flows from the warmer areas to the cooler areas, and the thermal energy is the total of all kinetic energies within a given system.” (Soffar, 2015) Now, we can explore the means to which heat is transferred and how each of them occurs. Heat is transferred through conduction at the molecular level and in simple terms, the transfers occurs through physical contact. In conduction, “the substance
that the rate of reaction must be fast enough to make as much of the