Firstly to calculated a sample for heat of combustion (-∆H) the heat (Q) needs to be calculated. Using the first tests’ results.…
If the test tube is closer to the watch glass then the temperature of the water will increase because more heat is being conducted and less heat is being released to the surrounding atmosphere. Using the equation q=M×C×ΔT, we can determine the calories used in Flaming Hot Cheetos.…
There were a numerous amount of observations and patterns in the data throughout the candle lab. The hypothesis was if the amount of candles inside the jar increases by an increment of one, then the weight of water in the jar will increase as well. The hypothesis was proven to be true, since for every candle added there was about 33 grams of water more. Every time the jar was placed over the candles, there would always be bubbles around the rim, also as more candles were used, the jar became cloudier and the bottom of the jar became more charred. The bottom of the jar also got hot, and after the jar was taken off the candles there would be grey smoke. The flame got larger as more candles were added, and the smell remained constant.…
Purpose: The aim of the laboratory exercise is to determine the time it takes for the flame of a candle to die out. The purpose of the experiment is to observe the burning flame and to determine the rate, in seconds, at which the flame of a candle burns out once it’s oxygen supplies has been depleted. To obtain the data, several beakers arranging in size will be used to help exhaust the oxygen supply to the flame. The purpose of the Graphing and Estimating lab is to consider what happens to the burn time as the beaker size gets smaller. The objective is to put the acquired data into a form of a graph and to use said graph to predict burn time of an unknown beaker size.…
Have you ever wondered whether a candle burns more quickly on a hot day, than on a cold day? Or is it the other way around? This science fair project was carried out to compare how quickly a candle will burn at different room temperatures. The experiment was done by measuring how much of a candle will melt in 30 minutes when placed in an environment with surrounding temperatures of 20°C, 25°C and 30°C.…
Hypothesis: For this Lab, my hypothesis was that the candles are going from solid to gas because of a high and quick rise in temperature.…
The data from this experiment demonstrates that the almond will produce a higher increase in the temperature of the water, when compared to the marshmallow. As shown in the observation chart, the change in temperatures for each almond trial is significantly higher than the marshmallow trials. It is also worth noting that the mass of the marshmallows are similar to that of the almonds. In fact, in trials one and three, the marshmallow has a larger mass than the almond. This information is significant in proving that the mass of the object is not an impactful factor in the amount of heat given off or the duration of the combustion of the object. During this experiment, it was determined that the almond required more thermal energy to combust…
For the unknown light source, it had almost every color, so it might have been be mercury because they have similar color beams and their color from the naked eye appeared as purple, which mercury, a light blue, is very close to in terms of it's color on the spectrum. For the unknown flame crystals, it may NH4+ because the colors that appeared are very similar to the crystals. Next, chemicals have to be heated in the flame for the color to emit because heat adds energy to the substance making the electrons more excited, allowing for the electrons to transition faster. Then, the method of lighting the substance on fire is far better than using the spectroscope. Not only does the fire burn it's colors more obvious, but also, light pollution tremendously…
The very first experiment had the hypothesis that the temperature of a burner flame can be controlled by adjusting the ratio of gas to air in the mixture to be burned. During this experiment, my partner and I gathered our materials of the paper matches, straight pins, copper wire, laboratory burners, rubber tubing, tongs, and evaporating dish. Making sure we had our safety goggles on and the material we needed, we connected the Tirrill burner into the gas and lit the burner with the match, having the air vents closed and the gas on. When the burner was lit, we noticed that the flame had a luminous, smoky yellow appearance. We then used a pair of tongs to hold the evaporating dish towards the top of the flame for 10 to 20 seconds. We observed…
Measurements were relatively accurate and closely linked to quantitative values. When measurement was a little higher, value resulted a little higher. The Styrofoam for this experiment was necessary because it insulates leading to less energy loss to the surrounding of the system. Because there was a change in temperature from the initial and final results, there cannot be an assumption that there was no heat exchange with the surroundings. To improve accuracy of result from this experiment, a better calibration and calorimeter may be used to reduce the amount of heat absorbed during the process.…
2. I don’t think that all the energy from the burning food went into heating the water. Some of it also heated the test tube and the air around it. Not all of the energy went into the heat; also some went into the light of the fire.…
Investigation of Combustion of Alcohols Aim The aim of this experiment is to investigate the combustion of various alcohols. The alcohols will be burnt to heat up a test tube of water, I aim is to find out how much energy is produced when burning the following alcohols: Methanol, Ethanol, Propanol, Butanol, and Pentanol. Any form of burning is an exothermic reaction (heat is given out), this means that the reactants energy is higher than that of the product. Alcohols react with oxygen in the air to form water and carbon dioxide.…
A firework is an incendiary device or material that can be used for signalling or entertainment. There are chemicals in the top of the firework that explode, which makes the colours seen. Fireworks, first originated in ancient China, with the first explosive being created from a mixture of black powder during the Sung dynasty. The firework was created by a combination of sulfur, saltpeter and charcoal. The Chinese found that the combination of these ingredients was very flammable and would blow up if its fuse is set alight. Fireworks were originally created for the purpose of entertainment and today they are still widely used in celebration to mark special occasions like independence day. The excitement produced by fireworks like , brightening the night sky and plunging it with vivid displays of colour and insignificant, which makes them a crowd pleaser. Behind all the excitement of fireworks, chemistry plays an important role in creating the vivid colours we witness lighting up the sky. The actual chemical reactions that take place in the explosions require the use of oxidisers, reducing agents and binders. The additions of varying metal chlorides add the colours. An oxidizing agent producing the oxygen required to burn the mixture. An agent e.g. Sulphur, that burn the oxygen and produce hot gases. Binders are required to hold the mixture in a lump. The ability of producing coloured light from the principles of fireworks have allowed this technology to be used for both industrial and military uses. Fireworks are now used for flares and smokescreens in our modern society. In Australia the non-authorised use of fireworks are banned due to the possibility of death or injury caused by stray rockets and uncontrollable explosions. Care is also needed because fireworks can damage your hearing and the fumes produced are toxic. The production of light in fireworks, rely on basic chemical principles such as redox reactions, combustion and the excitement of electrons in…
The amount of heat needed to increase the temperature of an object exactly 1°C is the heat capacity of that object. The specific heat capacity of a substance is then the amount of heat it takes to raise the temperature of 1g of the substance1°C. Caliometry is the precise measurement of the heat flow into or out of a system for chemical and physical processes. Heat flow is measured in two common units, the calorie and the Joule. 1 calorie= 1 kilocalorie = 1000 calories. A calorimeter is the device used to measure the absorption or release of heat. In this lab, the water in aluminum can “calorimeter” gains the heat lost during the combustion of a Cheeto.…
The first step in this experiment was to weigh and record an empty 100mL beaker. Then fill the beaker approximately halfway, weigh it and record the weight. Record the weight of the water in the beaker. Place a piece of aluminum foil on a table top. Place a wire burner stand with the beaker full of water in the center of the aluminum foil and place a candle next to the rack. Measure the weight of one marshmallow and the weight of one fork. Record both measurements. Then place the marshmallow on the fork measure and record the weight of the marshmallow and fork together. That weight should equal the measurements of the fork and marshmallow combined in the previous measurement. Measure and record the temperature of the water in Celsius and record it. Light a candle. Put the fork with the marshmallow over the candle flame. Remove the marshmallow from the flame right after it sets on fire and place it under the beaker of water. Hold it under the water until it is completely done burning. Make sure to stir the water frequently with the thermometer. When the marshmallow has burned down as much as possible, remove from under water and record the temp of the water. Then record the weight of the fork with leftover marshmallow on it. Subtract that measurement from the previous measurement of the fork with pre-burned marshmallow. Record the measurement of the marshmallow residue.…