Outlines the physical properties of the isotope The Physical properties of Plutonium 239 Colour: Plutonium is an actinide metal of silver colour, it forms an outer coating of dull grey appearance and begins to tarnish when exposed to oxygen. Melting Point: 639.5°C Boiling point: 3228°C. Density: 19.816 g/cm3 (at room temperature) Half-Life: 24110
The objective of the Bromocresol Green Equilibrium System Lab was to determine if the equilibrium constant, K, was a true constant at constant temperature. To determine this, the value of the constant was found at different concentrations of HIn, HIn-, and at varying pH, which was used to determine the concentration of H+. K was found using the equation K= [HIn]/([In-][H+]). In order to be a true constant, none of the values of K found should differ from the average by more than two standard deviations. The values of K for solutions 1-5 and U were 4.39E4, 4.53E4, 4.23E4, 4.70E4, 6.35E4, and 4.03E4 respectively.
“Accordingly two samples of hydrogen were prepared by evaporating large quantities of liquid hydrogen and collecting the gas which evaporated…” (Urey, H., Brickwedde, F. G., and Murphy, G. M., 1932), and then analyzed by the chemists, whom were searching for evidence of deuterium. The initial sample was not successful at proving deuterium’s existence; it was evaporated at -423.7°F (20 K or -253.2 °C), at a pressure of one standard atmosphere (100 kPa), and showed no enrichment of hydrogen-2 whatsoever. The second sample, however, was successful. It was evaporated at −434.5 °F (14 K or (−259.1 °C), at a pressure of 53 mmHg (7.1
Then 35 ml of 1.00 M of Sodium hydroxide was measured and set aside. Using the calorimeter, the hydrochloric acid was stirred heartily and its temperature was recorded as the initial temperature. The temperature of the Sodium hydroxide was assumed to be similar because they were both in the same conditions (lab) for the exact amount of time. Next the Sodium Hydroxide solution was added to the hydrochloric acid solution in the cups and stirred until the temperature stabilized. This was recorded as the final
The Effect of Alkaseltzer Tablets on the Boiling Point of Water Zackary Zambrano Chemistry Honors Mrs.Gregor Period-3 10/5/16 Introduction Statement of Purpose: The purpose of this experiment is to see whether or not alkaseltzer tablets have an effect on the boiling point of 100 mL of water. The control is just water, the variable groups are 100 mL of water with one tablet, and 100 mL of water with two tablets. “What exactly is boiling? The technical definition is what occurs when the vapor pressure of a liquid is greater than or equal to the atmospheric pressure.”(Lopez,k) Simply put water, boils when enough energy is released to cause bubbles and then turn to vapor. When water begins to boil, the water will continue to boil at
The theoretical yield for Zinc Sulfide is 0.49 grams but the actual yield is 0.38 grams. So if 0.38 is divided by 0.49 and multiplied by 100 then the percent yield for Zinc Sulfide would be 77.6%. When it comes to Sodium Chloride, the theoretical yield is 0.58 grams and the actual yield is 0.45 grams. So when 0.45 grams is divided by 0.58 grams and multiplied by 100, the percent yield would be 77.5% of Sodium chloride. The actual yield is directly taken from the mass of the products in the experiment while the theoretical yield is determined by using stoichiometric calculations.
This method is nearly always incorrect because it is difficult to obtain a perfectly saturated solution. In most cases, the solution remains unsaturated or it does not dissolve all the way. Also, for measuring the molar mass using freezing point depression for ionic compounds, it is important to determine the concentration of the particles of the solute, as the Van Hoff factor is not one, as it is for molecular solids. According to Atkins Peter, author and chemist of the book, Physical Chemistry says, “In predicting the expected freezing point of a solution, one must consider not only the number of formula units present, but also the number of ions that result from each formula unit, in the case of ionic compounds.” Therefore, this method works, but it is approximate and it works better for low solute concentrations. The presence of solute lowers the freezing point, which in turn affects the calculations to determine the molar mass of the unknown.
Name: Institution: Course: Instructor: Date of Submission: Absolute zero Abstract The purpose of this laboratory was to apply the ideal gas law and temperature and pressure measurements to extrapolate absolute zero value on a Celsius scale. This was done by recording Pressure and temperature measurement values for different n values. In addition, linear fit graphs of pressure versus temperature were plotted for the different n values. The absolute temperature value was then determined from the equation of the linear fit. The equipment used for this lab were: Vernier caliper, Rigid sphere, thermistor sensor, absolute pressure sensor, 4 buckets, water and ice.
He thought that the electrons must exist somewhere within this empty space. Rutherford thought that the negative electrons orbited a positive center in a manner like the solar system where the planets orbit the sun.Rutherford knew that atoms consist of a compact positively charged nucleus, around which circulate negative electrons at a relatively large distance. The nucleus occupies less than one thousand million millionth of the atomic volume, but contains almost all of the atom's mass. If an atom had the size of the earth, the nucleus would have the size of a football stadium.Not until 1919 did Rutherford finally identify the particles of the nucleus as discrete positive charges of matter. Using alpha particles as bullets, Rutherford knocked hydrogen nuclei out of atoms of six elements: boron (B), fluorine (F), sodium (Na), aluminum (Al), phosphorus (P) and nitrogen (N).
Doing some algebra, we can then reduce to the expression 〖nτ〗_E≥L T/σv where L is a constant, T is the temperature of the system, σ is the nuclear cross section, or chance that two particles have to collide, and v is the relative velocity of the two particles. Multiplying both sides by T then gives the triple product as a function of temperature. This is useful because it provides a minimum value for the product of 〖nTτ〗_E for a fusion reaction to occur (Lawson, J. “Some”). The exact value of this minimum will change depending on the type of fuel used in the reaction.