Comparison Between Observation And Interpretation

For the test tube with the ratio of Acetylene to air is 1:3, a flame traveled down a test tube even slower, there was a slight popping noise and black residue . For the test tube with the ratio of Acetylene to air is 1:7, a flame traveled quickly down a test tube, popping noise and less black residue. Refer to table 1 for the specific lab results.

The experiment can also be done to compare the burn rate of different colored candles.

If the difference between the recorded times are more than 10%, add a third trial. Repeat these steps with each size beaker. Calculate the average time for each beaker and record the data. The next step of the lab exercise is determining the exact volume of the beakers used in the burn time experiment. Fill a beaker to the top with water. Carefully pour the water from the beaker into a graduated cylinder. Reading the meniscus, record the exact volume into a data sheet. Repeat this step with each size beaker until all volumes are recorded into the data sheet. The final process of the Graphing and Estimating lab is plotting the recorded data onto a graph. Using the data recorded for burn time, in seconds, place the data on the vertical axis. Use the horizontal axis for the volume in milliliters. With the data points plotted determine whether a straight line or a simple curve will best represent the data. Now, obtain a jar and determine the volume. Fill the jar to the top with water. Carefully pour the water into a graduated cylinder. Precisely record the data. Using the plotted data on the graph and the simple curve or straight line to predict how long it would take for the flame to burn out on the candle if it was covered with the jar that was just measured.

Examine a piece of nichrome wire. On the data sheet, record the color and the luster of the metal. Use a forceps to hold the wire in the flame of your burner for about two minutes (recall where the hottest part of the flame is located). Describe the appearance of the wire while held in the hottest part of the flame. Allow the wire to cool and reexamine it. From your observations, determine if there was a physical or a chemical change. Give specific reasons for your conclusions. Save the nichrome wire for step #2.

The atom of an element has electrons that are found around the nucleus in regions known as orbitals. When energy is absorbed by the electrons of an atom they begin to jump to higher energy levels. When this happens the electrons are in an excited state. However when the electrons begin to release the energy and drop in energy levels they emit electromagnetic radiation. If the radiation that is emitted falls between 400 to 700 nanometers then the electrons emit photons which we can see as visible light.

Place the test tube containing cold water in a test tube clamp and hold the test tube above the burning alcohol. Observe the outside of the test tube for evidence of product formation.

Trial 1: A dish was filled with approximately 2 cm water and a candle mounted on clay was place in it. The candle was lit and a jar was placed over top of the candle so that it was resting on the dish. When the flame went out the water level inside the jar was measured. This process was repeated three times.

I study the flame as it seems to embrace and engulf the shape of the rounded end. Inside the bulb of the pipe is a friend that provides no

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This lab was not very fun, but it helped in learning the information. After this lab I learned how to find the heat gained/lost and I also learned how to calculate the heat of combustion of the candle and the molar heat of combustion of paraffin. Going into this lab I had no idea what these terms meant. After research, I discovered that heat of combustion is the amount of energy released in burning completely one mole of substance.

12) At this point, the temperature of the water may go above 40oC. If this happens, take the beaker of water off the flame and let it stabilise at 40oC again (try and maintain this temperature)

Observation is a fundamental and highly important method in all qualitative inquiry. It is used to discover complex interactions in natural

12. The crocodile clips are attached to the copper electrodes of the experimental apparatus and the power supply is turned on. Simultaneously, the stopclock is started. The thermometer is checked every 30s. 13. After 300s the stopclock is stopped and the power supply is turned off. The negative cathode is carefully removed and is dried using a hair dryer. 14. When dry the negative cathode is placed on the electronic milligram balance and its final mass is recorded. 15. The positive anode and negative anode of the experimental apparatus are disposed and the electrolyte is poured out to ensure that the anode slime (impurities) does not contaminate the solution. 16. The electrodes of the experimental apparatus are replaced with new copper strips. 17. Steps 7 to 16 are repeated. However, this time, the rheostat is adjusted using the calibration apparatus until the multimeter shows approximate readings of 0.40 A, 0.60 A, 0.80 A and 1.00 A respectively. 18. Time permitting, the entire experiment is repeated. Safety Copper sulphate may cause irritation and burns if it comes into contact with the eyes. As standard lab procedure, safety goggles and lab coats must be worn at all times. Control of Variables Volume of Electrolyte Used

In this field, professionals would determine what is true or worth knowing by means of empiricism, which is knowledge through direct sensory experiences. These senses include sight, smell, taste, touch, and sound. Chemistry uses those senses to understand different processes, such as breathing, digesting, etc. Such processes and many more interpretations will help understand and explain our world a little better. Knowledge comes from our observations and perceptions. Similar to what Aristotle has believed, we must look around us to understand. We must observe, record, analyze, and repeat. Evidence is the key in this field. During labs, collecting and recording data is so important. This would allow one to have a set of data points that may or may not show a relationship to whatever one is studying. Equations are made and used to better understand the data that was received and is reported. Repetition and patterns will then verify our accuracy and precision of our data. Protocols are made so that experiments can be repeated. This all relates to play a role within the scientific method as well. The scientific method is a

In the past, candle played an important role in each family whenever power cut and brought us precious and unforgettable memories with shadow games. Nowadays, candle has become a dispensable presence as its role to bring light in the dark has been replaced by torch and flashlight. But sometimes when we want to revive our childhood memories or have a candlelight dinner with our loved ones, we could not find a single candle because we did not buy a new one when the old candles burnt out. This is the moment when we need a candle that is reusable so we can use it for plenty times.