To wrap things up, the lab was made for us to really comprehend about the physical properties of substances. As a result, salt, sand, and iron was used for the purpose. Then our jobs were to figure out how to separate an unknown mixture and to revive them back away from one another. By doing this lab, I got to understand the differences between pure substances, compounds, elements, and mixtures.The reason why was because we observed substances by themselves and did not use them any further such as salt and iron, this hinted these were elements due to the fact that they could not be broken down any further since they had nothing else added to them. Plus, substances such the combination of salt and iron or sand and salt were mixtures since several
Solid A was identified to be sodium chloride, solid B was identified to be sucrose, and Solid C was identified to be corn starch. Within the Information Chart – Mystery White Solid Lab there are results that distinguishes itself from the other 4 experimental results within each test. Such as: the high conductivity and high melting point of sodium chloride, and the iodine reaction of corn starch. Solid A is an ionic compound due to its high melting point and high electrical conductivity (7), within the Information Chart – Mystery White Solid Lab there is only one ionic compound which is sodium chloride, with the test results of Solid A, it can be concluded that is a sodium chloride. Solid B was identified as sucrose due to its low electrical
The purpose of the Unknown White Compound Lab was to identify the unknown compound by performing several experiments. Conducting a solubility test, flame test, pH paper test, ion test, pH probe test, conductivity probe test, and synthesizing the compound will accurately identified the unknown compound. In order to narrow down the possible compounds, the solubility test was used to determine that the compound was soluble in water. Next, the flame test was used to compare the unknown compound to other known compounds such as potassium chloride, sodium chloride, and calcium carbonate. The flame test concluded that the cation in the unknown compound was potassium. Following, pH paper was used to determine the compound to be neutral and slightly
The unknown bacterium that was handed out by the professor labeled “E19” was an irregular and raised shaped bacteria with a smooth texture and it had a white creamy color. The slant growth pattern was filiform and there was a turbid growth in the broth. After all the tests were complete and the results were compared the unknown bacterium was defined as Shigella sonnei. The results that narrowed it down the most were the gram stain, the lactose fermentation test, the citrate utilization test and the indole test. The results for each of the tests performed are listed in Table 1.1 below.
The experiment was built in order to test our abilities to efficiently and correctly execute a separation of mixtures through deep brainstorming and teamwork.
Forensic Science Introduction: Someone in a restaurant has suddenly fallen ill and a mystery powder has been discovered with the victim. As the chief investigator, your duty is to identify the mystery substance through a lab. In this lab, it will consist of five known compounds and one unknown compound. Your job is to distinguish which one out of the five substances is the mystery powder. To figure out the mystery matter you will have to compare their physical and chemical properties and match them with the appropriate compound.
3.) Divide your 30g of white substance into the 4 test tubes evenly. You should put 7.5g into each test tube along with the water.
Based on our observations during the separation techniques and some speculation, we were able to identify eight components of our mixture: graphite from the filtration residue, Epsom salt from crystallization, water and acetic acid through distillation, red and orange dye, iron metal, marble chips, and sand.
Cu (aq) + 2NO3 (aq) + 2Na+ (aq) + 2OH- (aq) → Cu(OH)2 (s) + 2Na+ (aq) + 2NO3(aq)
To begin with, the authors, Larry Gonick and Craig Criddle, as I alluded to earlier, have written this book to consist of varying subjects and topics all underneath the umbrella that is chemistry. The twelve key subjects covered are hidden ingredients (basically properties and elements), matter becoming electric and their relation to electrons, togetherness and atomic structure, chemical reactions, heat of reaction, matter in a state (solid, liquid, gas) , solutions, reaction rate and equilibrium, acid basics, chemical thermodynamics, electrochemistry, organic chemistry, and using logarithms. Overall each subject is covered equally in depth and some subjects build upon each other while some don’t. There isn’t a specific author’s purpose rather than to educate the reader. However the subjects that constantly return and are tied in with each chapter are the history of chemistry and how chemical principles were discovered. These repeating subjects also show us applications of chemistry in the real world and the importance of chemistry in our lives. In general the book trudges through subjects...
Investigationg of Chemical and Physical Changes Why I am conducting this experiment? In order to learn how to recognize chemical and physical changes, I have to carry out this experiment to see different chemical and physical changes of different substance. How can we recognize physical changes and chemical changes? -----------------------------------------------------------
Also, I will know what a chemical and physical property is and I will know how to find them out. Materials = == == ==
In a paragraph, summarize the lab. During this lab we observed what happens when certain compounds are exposed to flame. We used bunsen burners to use for the flame. We used a nichrome wire to hold the sample of the compound when we burned it. As the compound was put into flame it burned and gave off a specific color of light. We did this to all our of known substances and recorded detailed observations about the color, flame height, and intensity. All compounds when introduced into a flame gave off different colors, due to their chemical make up. I feel my group did a good job at taking descriptive notes, which aided immensely in the determination of the unknown compounds. An error that might have occurred without any of us noticing could have been that we held different compounds to close to the flame
The goal of this experiment was to: create a dilute NaCl solution and calculate molarity, molality, and parts per million, experimentally determine the molarity of the same dilute NaCl solution through Mohr chloride precipitation technique, then, evaluate the accuracy by comparing the actual value to the experimental one. The actual molarity was calculated using the average density of three trials, mass of NaCl in solution, and molarity formula to be 0.0140 mol/L, the molality was calculated to be 0.0143, and the PPM was calculated to be 833. The experimental value for molarity, obtained through titration using AgNO3 as a titrant with Ag2CrO4 as an indicator, was averaged over three trials to be .01523 mol/L. Comparing experimental and actual values gave an estimated standard deviation of 0.00032 M with a confidence interval of +0.00079 at 95% and +0.0018 at 99%. The percent error for molarity was 8.8%. The experimentally determined molarity was functionally close to the actual molarity, however, some significant error in accuracy was observed. The amount of precision achieved with reasonable accuracy suggests this experiment could be used in testing salinity of separate bodies of water for comparison. The high % error inaccuracy, however, also suggests this should not be used in comparing minute changes in salinity in a single body of water.
Chemistry Experiment How does the change in the electric current used in the electrolysis of copper sulphate solution affect the mass of copper deposited on the copper electrodes? Aim --- The aim of this experiment is to find out whether the mass of copper deposited on copper electrodes during the electrolysis of copper sulphate solution changes when the current used to electrolyse the solution is increased. Hypothesis ----------
Solutions are homogeneous mixtures. A chemical solution is a combination of a solvent and one or more solutes. The solvent in a solution is the majority of the solution and the solute makes up the rest of the solution. When the solvent and the solute dissolve in each other you end up with a chemical solution. Many chemical reactions are done in solutions, and solutions are also very closely related to our standard everyday lives. For example the air we breathe is a solution made up of nitrogen, oxygen, carbon dioxide and some other gasses. Because air is not a compound if you added one extra unit of oxygen it would still remain as air. Solutions can be in gaseous, liquid or solid states.