Lab Report: The Heat Is On Experiment

The independent variable in the experiment was the mass (or amount) of the cheese and bacon balls.

Cold Working Lab Report Name Institution Table of Contents Abstract 3 Introduction 3 Experimental Procedure 4 Results 4 Discussion 6 Conclusion 6 Acknowledgement 6 Cold Working Lab Report Abstract The goal of this experiment was to establish and compare the material hardness versus % of cold work for 110 copper alloy copper and 260 cartridge brass. The aim was to predict the material that would almost satisfy the requirements of a Rockwell hardness of 40 HRB for a component. From the experiment, the thickness, average HRB, and percentage cold work were tabulated for both copper and brass.

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.

In this lab, there are two days. In the first day, there are is part A and part B. Part A is further divided into three experiments. In experiment one, we were to figure out the heat capacity of the calorimeter that we made. The next two experiment’s goal was to calculate the enthalpy of 2 reactions and using hess’s law, figure out the heat of formation of magnesium oxide. In a reaction, there are

Is this reaction endothermic or exothermic? What does that mean and how do you know? (~3 sentences)

Because it is dangerous to burn magnesium, it is not possible to directly record heat change. Our lab team suggests an indirect way of determining the heat of combustion for magnesium. To accomplish this, we need to perform two separate trials. One uses a solid (powder) version of MgO, while the other uses Mg ribbon. With the results from these, we can use Hess’ Law to determine q=∆H. This provides both a safe and successful way of indirectly determining the heat of combustion for magnesium.

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.

In the show, the respondents gave the pasta, and then they measured the levels of blood sugar every 15 minutes. Those who ate freshly cooked pasta had twice as higher blood sugar than those who ate the same amount of pasta which was first cooled and then heated again.

To my way of thinking, the answer is definitely no to the a） question. Our observation site and the weather observed there are not enough representative of the whole city of Tempe. There are two reasons for my opinion.

Discussion: When objects are placed under the microscope, it appears upside down and backwards. In part A, the letter E is placed right side up. But, when viewed through a microscope it looks as if it was placed upside down and backwards. In part B, the cotton strands with low power appears sharper when there is less light from the diaphragm. This is because with less light there is a sharper focus and when there is too much light coming from the diaphragm, the object can get blurry and out of focus.

We will be using 6 different fuels to heat up 100ml of water, and find out the changes of the temperature. We will measure the temperatures of the water before and after the experiment. We will burn heat the water for exactly 2 minutes, and check the changes in temperature. The change in temperature will allow us to work out the energy given off the fuel by using this formula:

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.

The overall purpose of the lab is to have the students practice designing an experiment, gathering data, and then analyzing that data to form a conclusion using the scientific method. It also served to understand key terms such as hypothesis, dependent variable, and independent variable. The specific objective of this lab is to determine whether certain human body parts experience allometric or isometric growth. Allometric growth defines when certain parts of an organism grow at unequal rates in comparison to its whole, while isometric growth is when all parts of an organism grow at the same rate in comparison to the entire organism. The specific purpose of the lab is to determine whether or not specific human body parts experience allometric or isometric growth by comparing the ratios of height to two specific body parts, in the students’ case the right hand length and head circumference, in students and newborns. The students formulated the tentative answer that if a team of four compared their height to right hand length ratio, as well as, their height to head circumference ratio, to those of a newborn’s, then the students will discover that the right hand and head experience allometric growth in humans.

Purpose: To measure the heats of reaction for three related exothermic reactions and to verify Hess’s Law of Heat Summation.

Although the investigation was able to provide more knowledge and understanding regarding the relationships between energy, activity levels and carbohydrate intake in order to contribute towards a solution to the problem of obesity, there were many limitations to this experiment that needed to be considered. For the personal data, the dietary observations collected over the two experimental days were not substantial to represent their lifestyle as a whole. Studies led by Burke et al., (2001) demonstrated that individuals can make inaccurate reports in various ways such as altering their dietary intake during period of recording, omitting or underestimating their intake and quantification errors of their consumption. As the group data was a collation of individual’s two-day dietary records, variability and inaccuracy increased considering the wide range of influences each individual may have been subjected to. There were 359 females and 195 males involved in the