What are the identities of the substances found after electrolysis and heating? The identities of the substances found were Iodine, Iodide ion (I-), Triodide ion(I3-), Zinc metal and Zinc ion(Zn2+) Post Lab questions: 1. What did this experiment convincingly show about the composition of the white solid? I put that the experiment showed us the white substance was comprised of Zinc ions and iodide ions, and that the two ions and be separated back into their respective elements 2. During the electrolysis, a gray solid formed on the negative wire of the battery and the dark red solution formed at the positive wire of the batter.
These tests consisted of a wafting test, a solubility test in deionized water, and a pH test. The unknown’s characteristics, discovered through the physical tests, were then compared with known cations: Sodium, Potassium, Calcium, Ammonia, and Magnesium. Flame tests were performed in order to classify the unknown cation. A small amount of the solid unknown ionic compound was placed on a watch glass. A wet swab was used to collect a small sample of the compound.
The string is tied onto a thin metal bar at A and fixed at B. A vibration generator causes the bar to oscillate at a chosen frequency. Explain how a stationary wave is formed. Then describe the key features of the stationary wave shown in Figure 4. * Waves reflect off the clamp and the rod * Waves travelling in opposite directions superpose * Waves have same wavelength and frequency, similar amplitude * Always cancellation at nodes and constructive superposition at antinodes * Energy is not transferred along string * 4 nodes where there is zero amplitude * 3 antinodes where amplitude is maximum * Wavelength 0.80m * End antinodes in phase and middle and ends in antiphase * Between node and antinode, amplitude of oscillation increases On her next jump the gymnast decides to reach a height above position B.
A separator membrane will then be infiltrated between the negative electrode gel and positive electrode preventing them from being mixed together which would make the battery useless if not in place. Silver oxide batteries are often quite small and produce a voltages of around just 1.5-6 volts which will remain flat over the lifespan of the cell which will not be as long as others such as the mercury cell which roughly is the same size and weight but may not be used as often as mercury is a toxic substance which can be harmful to humans. Silver oxide batteries have a low internal resistance which is quite constant throughout its lifespan as well as having a low temperature when in usage. These batteries will often be very small or described as button like which have a moderate capacity and in turn has a good pulsed discharge capacity. Silver oxide cells are great for usage in portable applications as they are very small which allows them to be fitted into small items such as watches calculators and other items.
Place one end of the filter paper in the zinc sulphate solution and the other end in the copper sulphate solution (making sure the filter paper is not touching the metals) - Using the voltmeter, touch both metals with the connecting wires so there is positive reading. Record the voltage, anodic metal and cathodic metal. - Repeat this process using an Iron metal strip in 50ml of Iron nitrate solution and a lead metal strip in 50ml of lead nitrate solution. - Combine the most reactive (anodic) metals from the first two cells, to create the next cell. This combination will determine the overall 1st and 2nd most reactive.
Copper (II) sulfate is a bright shade of blue, and very toxic to the environment, irritating to the eyes and skin, and also can cause damaging effects if swallowed. The lab involved calculations with mole ratios, the mass of water, and comparing the actual and theoretical masses. Also this lab dealt with determining the mass of the compound before and after heating had occurred. PURPOSE The purpose of this lab is to determine the mass of water that is contained in a sample of a hydrate of copper(II)sulfate MATERIALS •large test tube •utility clamp •iron stand •bunsen burner •flint lighter •balance •hydrated copper(II)sulfate •stirring rod PROCEDURE 1. The mass of a clean dry test tube was accurately measured.
If there wasn’t enough solution to react with it then that would explain why we still had some left over that didn’t. For the zinc, the handbook says that it is insoluble in water but soluble in acid. Likewise we observed the same thing, the zinc did not dissolve at all in the water but became somewhat soluble in hydrochloric acid. The Zinc began to fizz but in the end not all of it was dissolved although there was significantly less than we started
Jose Flores 6th period 1-27-14 LAB REPORT Introduction: A substance can conduct an electrical current if it is made of positively charged and negatively charged particles that are free to move about and is called a conductor. The purpose is to figure out conductivity of substances and to check which one conducts electricity. The hypothesis is that sucrose would be the only one that could not conduct out of the other six solutions. Materials: The materials used in this lab where six solutions , napkins, 2 pairs of gloves, 2 cups (1 cup with distilled water and 1 cup with solid NaCI) and a conductivity meter. The six solutions are sodium chloride, hydrochloric acid, sodium hydroxide, acetic acid, ammonia and sucrose.
In the experiment, toluene was alkylated with 2-chloropropane to synthesize isomers of isopropyltoluene in 47% yield, weighing 2.66g. The final product had a purity of 91.8% while the appearance was a colourless clear liquid with a strong odour. The results suggest that although the product yield was low, the experimental design led to the production of isopropyltoluene in high purity. REFERENCES 1. Smith R, McKee J, Zanger M. The electrophilic bromination of toluene: Determination of the ortho, meta, and para ratios by quantitative FTIR spectrometry.
Observations Data Table 1: Experiment Data | | Grams (g) | Percent of Mixture (%) | Initial Mixture | 6.5 | 100 | Iron Filings | 1.8 | 27.69 | Sand | 1.7 | 26.15 | Table Salt | 1.9 | 29.23 | Benzoic Acid | 0.8 | 12.31 | Combined Total | 6.2 | 95.38 | Questions A. How did your proposed procedures or flow charts at the beginning of this experiment compare to the actual procedures of this lab exercise? The flow chart I created listed each substance and the weight, it looked similar to the one on the disc but did not have a column for percentage B. Discuss potential advantages or disadvantages of your proposed procedure compared to the one actually used. The disadvantage of my flow chart would be that the weight would have been measured but the percentage would not give the accurate scientific measurements.