Experiment 1: Heat Associated with Chemical Change In this experiment, the heat of combustion reaction of a wax candle was measured. First, a clean 7.7180 g metal can was obtained, and into it a 100 ml of cold water was placed. The mass of the can and water was measured to be 112.9789 g. For all temperature measurements, a calibrated thermistor connected to the LabWarksTM interface was used. The temperature of the cold water before heating was 17.8 °C. Further measurement, including the mass of the candle before heating was also recorded and equal to 7.1954 g. Moreover, an experimental setup was prepared by placing the metal can on a ring stand with clay triangle to hold it, the wax candle placed as close as possible to the candle, and the thermistor placed inside it to measure the water change in temperature. While burning the candle, and stirring the water with the thermistor, a …show more content…
First, 125ml Erlenmeyer flask with a rubber stopper that had a hole in it was immersed for ~ six minutes in a previously heated 200 ml of water. With the hot plate on, and after 6 minutes of boiling, the temperature of the boiling water was measured to be 98.0°C using calibrated thermistor connected to the LabWarksTM interface. Moreover, the flask was transferred into an upside position to an ice bath in a large beaker, it was immersed for ~five minutes where water drawn into the flask was observed. Using a thermistor, the temperature of the cold water was 3.2°C. Then, the volume of the water that was drawn into the flask was determined by transferring it into a 100ml graduated cylinder, it turned to have a volume of 42.0 ml. However, the volume of the full flask with the stopper in place was 155.0ml as the flask was filled with water to its neck, then poured it into the graduated
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
It was learned that changing the volume of the same substance will never change the boiling point of the substance. However having two different substances with the same volume will result in two different boiling points. The purpose of this lab was to determine if changing the volume of a substance will change the boiling point. This is useful to know in real life because if someone wanted to boil water to make pasta and did not know how much water to
On the lid of the calorimeter, there were two holes and one was being used for the thermometer, and the second one was left open. This hole could have let heat to escape as the reaction was taking place which would have lowered the final temperature value. These conditions would have led to a lower final temperature value. To prevent even the slightest anomalies in the future, any holes on the calorimeter can be covered by tape or another item that could block the passage. The top of the calorimeter could also be covered with aluminum and this would not only cover the holes but would secure the space under the lid so any heat that may escape would stay within the area due to the aluminum. Aluminum could also be tucked in the space between the lid and the calorimeter to once again lock the heat in. This way, the calorimeter will be more effective and maintain all the heat of the reaction resulting in values that are completely accurate and decreasing even the slightest
When the amount of hot water released and cold water absorbed do not coincide, then it means the calorimeter is absorbing some of the heat. The amount of heat that is actually released depends to the mass, specific heat of the substance, and the change in temperature.
A precipitation reaction can occur when two ionic compounds react and produce an insoluble solid. A precipitate is the result of this reaction. This experiment demonstrates how different compounds, react with each other; specifically relating to the solubility of the compounds involved. The independent variable, will be the changing of the various chemical solutions that were mixed in order to produce different results. Conversely the dependent variable will be the result of the independent variable, these include the precipitates formed, and the changes that can be observed after the experiment has been conducted. The controlled variable will be the measurement of ten droplets per test tube.
To gain reliable results we needed a temperature rise of 50 degrees centigrade in the quickest time. possible. Then we can do it. Using the Propanol burner with different volumes of water we. tested the flame at varying distances under the calorimeter measured.
The objective of this experiment will be to combine various substances, liquids and metals, and to observe their behavior when they are combined. The types of reactions observed shall determine the nature of these reactions: physical or chemical.
Experimental Summary: First, my partner and I put the marshmallow and cheese puff on T-pins and used the Electronic Balance to measure the mass of each of them. Next, we put 100 mL of water in the 100 mL Graduated Cylinder and poured it into the 12 oz. soda can. We measured the temperature of the water with the thermometer. After
Chemical kinetics is a branch of chemistry that involves reaction rates and the steps that follow in. It tells you how fast a reaction can happen and the steps it takes to make complete the reaction (2). An application of chemical kinetics in everyday life is the mechanics of popcorn. The rate it pops depends on how much water is in a kernel. The more water it has the quicker the steam heats up and causes a reaction- the popping of the kernel (3). Catalysts, temperature, and concentration can cause variations in kinetics (4).
A Comparison of the Laboratory and Industrial Processes When going through the process of fermentation in a laboratory they use certain methods to achieve their goals and some of the methods that they use are completely different from the ones that are used in the industry of fermentation. A fermenter is a container that maintains optimum conditions needed to grow a particular organism I will be using different criteria’s to compare the laboratory and industrial process of fermentation in this assignment; some of them are listed below: * Equipment Used * The Quantity of the Product * Method Used * Quality of the Product Before I get right on into the assignment I will firstly talk about penicillin is and what it is used for today in our society because penicillin will come up. Penicillin was discovered by Alexander Fleming in 1929 and penicillin is one of the earliest discovered and widely used antibiotic agents, derived from the penecillium mold and the use of penecillium did not begin until the 1940s. Penicillin kills bacteria by interfering with the ability to synthesis the cell wall and this will disallow it from splitting and reproducing and it will only lengthen longer Below are is a table that shows the most obvious differences in fermentation in a laboratory and fermentation in the scientific industry: Laboratory Fermentation: Industry Fermentation: It is a batch culture They use a Ph sensor The Ph level is not being controlled The equipment used is more expensive The temperature is not being measured They use a thermometer The yeast population isn’t been given O² They equip the fermenter with an exit gas and an exit liquid flow The food supply is not being replenished They also equip it with a antifoam and gas flow It also has a dissolved O² sensor Equipped with an Sparser In industry they have a fresh media feed
First, a calorimeter was constructed with three standard styrofoam cups. One cup was stacked within the second for insulation, while the third cup was cut in half to be used as a lid. The lid was made to increase accuracy when recording the temperature. The temperature probe hooked up to Logger Pro software poked a hole in the top of the calorimeter by applied force with the end of the probe through the Styrofoam. Meanwhile, 40mL of deionized water were measured out in two clean 50 mL graduated cylinders, and poured into 100 mL beakers. The beakers and graduated cylinders were cleaned with deionized water to avoid contamination that may cause error. One of the beakers was placed onto a hot plate, which was used to heat the water in the beaker. The other beaker rested at room temperature. Once heated and at room temperature, the initial temperature was measured with the probe. Next, the two 40 mL of deionized water were poured into the calorimeter, quickly sealed with the lid, and the temperature probe emerged through the top of the calorimeter into the water to measure the temperature so the calorimeter constant would be determined. The equations used to determine the calorimeter constant were Δq = mCΔT and Δq =
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.
During the experiment I will be taking a number of measurements, I will firstly take the initial temperature of the water and initial mass of the alcohol I will then burn the alcohol until an increase in temperature of 20oc has occurred in the water I will then reweigh the alcohol.
Objects that are not the same size but have the same surface area to volume ratios loose heat at the same rate. So a flask, with a volume of 200cm3 with a surface area of 160cm2 and a surface area to volume ratio of 1.25:1, will loose heat at the same rate as a similar flask of volume 625 and a surface area of 500 which also has a surface area to volume ratio of 1.25:1. However, generally when you increase the size of an object the surface area to volume ratio decreases so in this example it is very likely that the two flasks in question are different shapes.
borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may