What Is The Caloric Content Of Food Lab

Combustion Reaction: A chemical reaction between a fuel and an oxidizing agent that produces heat.

Diffusion is a high concertation of molecules spreading randomly to a lower concertation. This an example of passive transport that does not require ATP. A lipid bilayer can only easily allow small molecules that are non-polar through it. Water is an exception because it can defuse through with a process called Osmosis. Special aquaporin proteins allow the water through the semi-permeable membrane. Starch is a polysaccharide made of many glucose monosaccharides bonded together. It is insoluble in water. Glucose is soluble in water and is also a monosaccharide.

The purpose of this experiment was to test multiple brands of popcorn under the same setting in order to conclude which one statistically popped the most kernels. I tested the butter flavor of Orville Redenbacher, Wal-mart’s Great Value brand, and Pop Weavers. The different bags of popcorn were popped in the same microwave for the same amount of time, 3 minutes and 15 seconds. Then, the popped corn was counted, as well as the un-popped kernels, in order to determine a ratio, and then I recorded the results in the data table. I repeated these steps two more times for a total of 3 trails for each brand. Then I compared the ratios of all the bags to determine which brand yielded the most popped corn. The statistical technique used to evaluate the data was to find a ratio between the number of kernels in the bottom of the bowl and the number of popped kernels. To find this, I divided the number of the actual popped corns by the total number of kernels left in the bottom of the bowl. The ratios and percent were then compared. Once all my results were in the data table, I averaged the 3 trials for each brand of popcorn.

    One possible source of error that can affect the results was that a mercury thermometer was used instead of an electronic one. The use of a mercury

The purpose of this experiment was to find, compare, and contrast the mass, volume, and densities of copper and zinc pennies. Information about the pennies was acquired before the start of the lab. The pre-lab research stated that any pennies that were minted before 1982 are composed of pure copper, while any pennies after 1982 are made out of zinc. The densities of copper -- 8.96 grams per centimeters cubed -- and zinc -- 7.13 grams per centimeters cubed -- were also information that was acquired before starting the experiment. With knowing the density of the two metals, this hypothesis was formed: If the mass and volume of pennies made out of zinc and copper are both measured, then the copper pennies will have a greater mass, because copper has a greater density than zinc. This hypothesis was formed because density equals mass over volume and if the mass is greater in an object that has the same volume, then the density of the object will be greater than the other.

The objective of this lab was first to convert the mass of a compound to the number of moles and number of molecules and then determine the concentration of salt and its component. The first thing we did was get the mass of an empty container by using a scale and it came out to be 16.87g. Next thing we did was pick a substance which in this case it was Potassium Chloride and placed it on the scale to get a total mass of 31.20g. The container the Potassium Chloride was in only had a mass of 16.87g which means that the mass of the substance was 14.33g. To convert the mass to the number of moles we took the amount of the substance 14.33g and divided it by the mass of Potassium Chloride 74.55g and figured out that the number of moles was 0.192.

The percent mass of each component of the mixture was 23% iron, 61% sand, and 8.7% salt.

The boiling point elevation constant for water that was experimentally determined in this analysis was 0.4396 °C/m, which was derived from the slope of the trend line in Figure 2. This is slightly lower than the constant provided in lecture of 0.51 °C/m. This could be due to further evaporation of water from the solutions tested via refractive index after the boiling temperature was recorded.

Aim: To plan, conduct, evaluate and report on an investigation of chemical changes, and make recommendations for their use as an energy source in Heat-and-Eat meal packs.

Combustion is the chemical process of a combustion reaction in which a fuel burns with the aid of an oxidiser to yield a particular product. When an alkanol is burned, the product will consist of carbon dioxide, water and heat, as shown in figure 2.

When the fuels are burnt, energy is given off. I will be calculating the energy given off using the formula above. The specific heat capacity is the energy

Heat is a form of energy that is transferred between two substances at different temperatures. The flow of the energy is from the object of higher temperature to the object of lower temperature. The heat is measured in units of energy, usually calories or joules. Temperature on the other hand, is how cold or hot an object is. The temperature is the average kinetic energy per molecule of a substance. This is measured in degrees on the Celsius or Fahrenheit or in Kelvins.

mimimum temperature was recorded as 11 °C. Although there is only a slight rise in

Thermochemistry is the quantitative study of heat and enthalpy changes in chemical reactions. Enthalpy (H) “… is a measure of the total energy possessed by a substance or group of substances.” (Smith 2006, pp. 289). The change in enthalpy (∆H) of a substance is defined as the heat absorbed or released during a chemical reaction.

Carefully add all of the acid to the base in the calorimeter being careful not to splash any acid on the upper sides of the calorimeter. Stir the mixture gently with the thermometer observing the temperature every 15 seconds for the next 2 minutes. Seconds: 15s: 31, 30s: 31, 45s:31, 60s:31, 75s: 31, 90s: 31, 105s: 31, 120s: 31, 135s: 31