A 125 mL flask was obtained. The square of aluminum was fashioned over the flask by laying the foil over the mouth and folding the sides down. A pin was then obtained and was used to poke a tiny hole in the center of the aluminum cap.…
Abstract: A 50mL (we used 100mL) volumetric flask was used to determine the amount of sugar in a can of Coke per mL in 5 different solutions. Using the calibration curve we determine the amount of sugar per mL in a can of coke. This experiment concluded that there is 43.83g of sugar in a 12oz can of Coke.…
Paul Fitts’ was the first to discover the relationship between the speed of movement and accuracy requirements. This has become one of the most fundamental principles of motor control. Fitts claims a relationship between task difficulty and movement time. He quantified task difficulty as “index of difficulty” which consists of the ratio of twice the amplitude over width of the target (2Amplitude/Width). This relationship states that when movement amplitude decreases or when target width increases movement time is shorter (Fitts, 1954). Fitts found that the relationship between amplitude and width was given by the equation: MT= a + b[log2(2A/W)]. The empirical constants a and b represent the y-intercept and the slope (Schmidt & Lee, 2011).…
5) The atomic umber of sulfur is 16. Sulfur combines with hydrogen sulfide. Based on the electron configuration of sulfur, we can predict that the molecular formula of the compound will be…
If an air bag has a volume of 36 L and is to be filled with nitrogen gas at a pressure of 1.15 atm at a temperature of 26.0°C, how many grams of NaN3 must be decomposed?…
In this experiment we were wanting to find the specific heat of an unknown metal and determining what metal it was by using the formula q=c X m X change of temperature. We did two trials to compare the two and see what we come up with.…
Double-replacement reactions commonly occur when one of the products is not soluble and precipitates out of the reaction solution as a solid:…
1. Determine the mass of the samples to the nearest 0.01 gram. Record. 2. Fill a 100 ml graduated cylinder about three quarters full with water. Measure the volume, and record as “volume of water alone” in the data table. Tilt the cylinder and carefully slide one of the samples down the side. Make sure the sample is completely submerged in the water. Measure the volume and record as “volume of water + sample” in the data table.…
The activation energy obtained in Part C, 138.6 kJ/mol is not too far below the theoretical activation energy of 148.526 kJ/mol[6], while Part A confirms the theory that k is dependent on the initial concentration of reactants, since it is a first order reaction. This is clearly depicted in Figure 3, where the alteration of the amount of t-butyl chloride being added to the reaction vessel clearly produced a different rate constant. The findings from Part B of the experiment proved that the reaction followed the SN1 mechanism, with the increased concentration of water in the water/acetone mixture causing the reaction rate to increase due to the usage of polar solvents to stabilize the carbocation being produced during this mechanism in the slow, rate-determining step [5]. However, there were errors in the experiment, which led to the results being slightly off from theory, such as the lower than expected value for the activation…
ESSAY. Write your answer in the space provided or on a separate sheet of paper. 1) Explain the difference between a qualitative and a quantitative measurement. Provide examples to illustrate this difference. Answer: A qualitative measurement is a measurement that gives descriptive, nonnumeric results; a quantitative measurement is a measurement that gives definite, usually numeric results. "The rock is heavy" would be a qualitative measurement. "The rock weighs 110 grams" would be a quantitative measurement.…
reports of their laboratory work in such a fashion that the reports can be readily reviewed.…
Heat always flows spontaneously from matter at a higher temperature to matter at a lower temperature.…
In this lab the standard heat of combustion of magnesium was calculated by using the calorimeter. Also, the point of combustion of magnesium was to see how much heat would be released from fireworks such as sparklers. The concept of this lab was to find the difference in temperature from the beginning to end of combustion of magnesium and calculate the standard heat of combustion of magnesium by using the calorimeter and a thermometer. By using the thermometer, we found out the change in temperature which helped to find the specific heat of water. The reactions were exothermic because of heat that was released into the surroundings from the reaction. Exothermic is a reaction of process that releases energy in the form of heat. Also, the Q that was measured is –Q of the reaction because Q system = -Q Water. After the difference in temperature from beginning to end of the reaction was taken, the Q = m∙c∙ΔT was used to find the Q of Water and system. Then 1 mole was converted into kilojoule per mole. The kilojoule per mole calculated was used in Hess’s law in order to calculate delta H. As there are always some errors in a lab, the amount of hydrochloric acid could have been off by ±1 or 2mL. When the thermometer was put into the calorimeter, it made a hole which helped the heat to escape from the calorimeter. Also the initial temperature of the water could have been different for every reaction. The percent error in our lab was -4.89%.…
.2400 grams of the unknown compound. This is done in duplicate and purple-tinted precipitates are placed in Gooch crucibles. The precipitates are suction dried using ethyl alcohol then acetone to…
Lastly, I am a strong academic student with a plan to go to college, therefore, taking the most challenging courses I can take in high school is a wise plan that I have thought out. Being in a honors course helps me to be more academically inclined. Rigorous and challenging work is the best way to prepare for college, and is heavily weighted by college admissions. Many colleges recalculate applicants’ GPAs, giving extra points for honors courses.…