Nathan Bahn Beer’s Law Study Lab Introduction: In this lab, we used a spectrometer to observe the transmittance of light at a certain wave length. We experimented to see if the molarity of a solution changes the transmittance of light and the absorbance of that light by the solution. By observing the percent transmittance and the amount of light absorbed, we can calculate the amount of color absorbing components in the solution. Through this process is how we are able to discover the amount of copper in the solution. Experimental Procedure: 250 mL of the copper solution was made by creating 100 mL of the solution, reacting CuO with HNO3, and then diluting to the mark of 250 mL.
Density of Pennies Lab Introduction “The one cent coin, commonly known as the penny, was the first currency of any type authorized by the United States.” (www.pennies.org, pg.1)The first penny was made in 1787, composed of pure copper. They continued to produce pure copper pennies until 1837 when they switched to bronze. In 1857 they began using copper and nickel. The composition of a penny changed twice more before 1982. The pre-1983 penny was made of an alloy of copper and zinc.
2: First you measure the mass of the copper tacks and also try to get the mass of the water in the thermos as close to 0.1 kg since 1 dl of H20 = 0.1kg H20. 3: Using the test tube holder, sink the test tube with the copper in it into the 4: The electric kettle is now supposed to make the water boil and raise the temperature of the copper as close to 100ºC (T1cu) but it is not very likely that you will get exact 100ºC due to heat loss. This step will almost certainly take a couple of minutes. 4: Measure the temperature of the water in the thermos (T1w) and then add the tacks to the water in the thermos. 5: Now measure the temperature of the water (T2cu and T2w will have the same temperature).
History and Uses: Rubidium was discovered by the German chemists Robert Bunsen and Gustav Kirchoff in 1861 while analyzing samples of the mineral lepidolite (KLi2Al(Al, Si)3O10(F, OH)2) with a device called a spectroscope. The sample produced a set of deep red spectral lines they had never seen before. Bunsen was eventually able to isolate samples of rubidium metal. Today, most rubidium is obtained as a byproduct of refining lithium. Rubidium is used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes.
Its melting point is at 1357.77 Kelvin and boiling point is at 3200 Kelvin. The electron configuration for copper is 1s2, 2s2, 2p6, 3s2, 3d9. Copper has 2 isotopes, Cu-63 and Cu-65, and they are used to study copper metabolism and gastrointestinal diseases. Cu-63 can be used to make Cu-64 which is used in cancer diagnosis and treatment. Copper plays a very important in our lives.
Design Lab-Chemistry HL Date; 27th February and 1st March 2013 Grade 11 Increasing the temperature to increase the rate of reaction between sulfuric acid and iron powder Experiment; To investigate the effect of temperature of reactants on the rate of reaction Focus Question; How does temperature (30, 35,40,45,50 degrees Celsius) affect the rate of reaction of H2SO4 (1.0M, Volume; 20ml) and Fe (2.5g) in 6 minutes? Fe (s) + H2SO4(l) FeSO4(l) + H2(g) Variables; Independent Variable- Temperature Dependent Variable- how much hydrogen gas is produced Controlled Variable-Sulfuric Acid (1.0M, Volume; 20ml), Iron powder (2.5g), and time (6 minutes) Materials; 3 100ml Flasks 1 cork 1 tube 1 100ml graduated cylinder 1 25ml graduated cylinder 1 clamp stand 1 spatula 1 apron A pair of gloves 1 dropper 1 tub of water 1 waterbath 1 balance scale Stopwatch 3 pieces of paper 2 thermometers 37.5 grams of Iron Powder (Fe) 300 ml of 1.0M H2SO4 Procedure; 1. Wear an apron, gloves and goggles for safety reasons 2. Obtain all materials which are 3 100ml flasks, 1 cork, 1 tube, 1 100ml graduated cylinder, 1 25ml graduated cylinder, 1 clamp stand, 1 spatula, 1 dropper, 1 tub of water, 1 waterbath, 1 balance scale, 1 stopwatch, 2 thermometer to your work place 3. Then obtain 37.5 grams of iron powder, and 300 ml of 1.0M H2SO4 to your work place 4.
Proving the Law of Conservation of Mass using the Copper Cycle Introduction Copper is used in many important industries such as agriculture, petroleum, ceramics, and even in medicine. In this experiment, different forms of copper will be observed throughout the copper cycle. For the experiment, copper will be reacted through the copper cycle where it will go through different reactions in order to return back into pure copper at the starting point of the cycle. The purpose of the experiment is to demonstrate the law of conservation of mass, which states that while matter can change from one form to another, during a given reaction, the total mass must remain the constant. Materials/Equipment: 50 ml beaker, hot plate, plastic funnel, aspirator, rubber tubing, ring stand, clamp, iron ring, weighing boats, magnetic stir bar, disposable pipet(s), filter flask, Buchner funnel, filter paper, distilled water bottle, stirring rod, watch glass, litmus paper- red, 10 ml graduated cylinder.
The calorimeter was designed in 1780 by a chemist named Antoine Lavoisier with help from a mathematician by the name of Pierre Simon de Laplace. Now a widespread tool, we will be using the calorimeter, and our knowledge of equations to find the specific heat of zinc and aluminum. OBJECTIVE/GOAL In this experiment we will Measure the mass and temperature of water in a calorimeter Heat a metal sample of a known mass to a specific temperature Calculate the change in water temperature caused by adding the hot metal sample Calculate the specific heat of the metal using your mass and temperature data PROCEDURE 1. Prepare a data table as directed in the Analysis. Safety goggles and lab apron must be worn for the experiment.
Determination of the pKa of Methyl Red by UV-Vis Spectroscopy February 16, 2010 (Partner:) ABSTRACT The purpose of this experiment was to obtain the pKa for an acid-base indicator. A spectrometer was used to determine the pKa of methyl red. The calibration curves were created by analyzing samples of known concentration at pH’s well above and below the pH indicator range for methyl red. Then samples of known pH were analyzed. By, solving the system of equations using linear algebra, the concentrations of the indicator and the conjugate base were determined.
For example, he put iron (Fe), which is a metal, in the same group as oxygen (0) and sulfur (S), which are two non-metals. As a result, his table was not accepted by other scientists. Mendeleev In 1869, just five years after John Newlands put forward his Law of Octaves, a Russian chemist called Dmitri Mendeleev published a periodic table. Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful. He realised that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.