...This report discusses two lab experiments on studying mixtures. The first lab was called Investigating Mixtures. The objective of that lab was to observe that not all liquids behave the same way when mixed with other liquids. We had to determine what would happen when you put vegetable oil into water. My hypothesis was when the vegetable oil is mixed with the water the oil will stay on top of the water. The second lab was called Mixed Substances. The objective for the lab was to see how properties of individual substances compare with properties of a mixed substance. Before we started the lab we had to define the different types of mixtures we would be working with. A mixture is a combination of two or more substances mixed together physically but not chemically. A homogeneous mixture is a uniform structure or composition throughout a substance. And lastly, a heterogeneous mixture contains dissimilar parts or elements. My hypothesis was that when you mix water with cornstarch you would get oobleck. Next, I will share what i learned from the experiments....
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...In each part of the investigation, identify the type of change that took place and support it with evidence from your observation table. Test A: A chemical change occurred. I know this because bubbles formed when the two substances mixed. I also know this because a gas was formed, and an indicator of a chemical change is when a new substance forms. Test B: A chemical change occurred. I know this because there was both a production of light, and a production of heat. Also, the change that occurred is irreversible. Test C: A chemical change occurred. I know this because the mixture was opaque, while the copper was translucent before mixing. I also know this because small bubbles formed when the substances were mixed. This is also an irreversible...
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...Introduction Through this lab, we are trying to find out if 6 drops of the enzyme pectinase, 6 drops of the enzyme cellulose, 3 drops of each enzyme, or 6 drops of distilled water with be most effective in creating apple juice when mixed with 50 grams of apple sauce and then filtered. With that, we need to figure out which will be most cost effective so that the apple juice company knows which substance will benefit them the most. We are aware that pectinase costs $50 per liter and Cellulase costs $100 per liter, which will make an immense impact on the decision, taking data into consideration, of course. When conducting this experiment, our independent variable was substance type. Our different types of substances were pectinase, cellulase,...
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...discussed. The students will explore the principles of inorganic chemical phenomenon including partially soluble substances, weak acids and bases, buffer systems and redox reactions. In addition, a basic understanding of the chemistry of the biologically important elements (H, C, N, O, K, Na, Ca, Mg, P, S, Cl and some transitional elements) will be explored. Course Learning Outcomes Upon successful completion, students will be able to: • Predict cation and anion concentrations of partially soluble solids dissolved in pure water and in a solution containing a common ion. • Apply knowledge of acids and bases in order to predict the pH of a solution containing a weak acid or base. • Demonstrate the use of common pH and redox indicators in microbiological media. • Select appropriate reagents to make a buffer having a desired pH. • Determine which compounds undergo the process of reduction and which undergo the process of oxidation. • Describe the basic chemistry of the predominant biologically important elements and their function(s) in microbiological systems. Dr. Andrew Baer Office Hours Monday: 10:30 am – 11:20 am Wednesday: 1:30 pm – 2:20 pm Thursday: 9:30 am – 10:20 am or by appointment Email: abaer@centennialcollege.ca Textbook: Hage, D.S and Carr J.D Analytical Chemistry and Quantitative Analysis, Prentice Hall, 2011 (optional) CH 125 Lab Manual (available on eCentennial) Additional References: Harris, Daniel C., Exploring Chemical Analysis...
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...Introduction Being knowledgeable about what makes up a certain substance, and the concentration of it, can be very crucial in certain situations. An example of that, which applies to the environment and is very common, is the use of pesticides on various crops. Pesticides are essential to insure that crops are not contaminated by pests. Pests are destructive insects that attack crops, leading to diseases. Pesticide is a substance used to get rid of pests. As a producer of the crop, it is very important to know what chemicals make up the pesticide, and its concentration. If the chemicals are too strong, or if the concentration is too high, then there would be a possibility of destroying the crop itself. On the other hand, if the chemicals in the pesticides are too weak, or if the concentration is too low, then there will not be the full...
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...Blair Savelli Lab partners: Kody Brusso and Angel Penn 9/15/11 General Chemistry 121 Dr. Rhode Separations of Mixtures Abstract- The purpose of this lab was to use physical means to separate mixtures to find the mass percent of NaCl. Materials and Methods- The materials and methods described by the lab manual were followed, except for part B., Filtration: Collection of calcium carbonate. The substance left after being filtered, was scrapped off of the filter paper and placed into a watch glass. However, that part of the lab was supposed to be omitted so in the calculations, the watch glass was weighed and subtracted from the filter paper/ white substance/ and watch glass combination. Also, part C., Recrystallization: Purification of vanillin, was omitted. Observations- A.) Evaporation: Determination of the mass percent of sodium chloride in a saturated sodium chloride solution: The 6mL of NaCl in the evaporating dish that was placed on the beaker half-filled with boiling water was left for 20 minutes. After the elapsed time, the evaporating dish had no liquid in it. Instead, the dish contained what looked like rock candy, but having known that NaCl is salt, it was hypothesized that the clear crystals were in fact salt crystals. B.) Filtration: Collection of calcium carbonate: After the calcium chloride and sodium carbonate were poured together, the mixture had a thick gelatinous texture to it. When the two substances were mixed with a stirring rod, the whole mixture...
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...In 2012, Annie Dookhan, was a lab technician at the crime lab. Dookhan was arrested in Boston with charges of obstruction of justice and Perjury. It is said that Dookhan was responsible for testing substances brought in by police that appeared to be an illegal substance. It was noted that her work performance was above the norm by over 50% of her other coworkers. Dookhan was called Superwoman due to her testing over 500 samples in a month while the norm is 150 a month. This raised concern which started an internal investigation. During their investigation, it was determined that Dookhan had tested approximately 60,000 drug evidence samples during her employment in the lab. So far, over 1,400 samples were found to be tainted. After her arrest,...
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...DNA profiling using gel Name:Maurevensly Jeudy Lab partner: Urvi Abstract This lab consisted on utilizing and learning about DNa fingerprinting and it’s process, from building up an comprehension of how electrophoresis and confinement compounds are utilized as a part of connection to DNA fingerprinting to contrasting the DNA parts got from the two suspects to the DNA parts from the wrongdoing scene keeping in mind the end goal to decide regardless of whether there is a match. It was anticipated from an arbitrary figure that of the comes about because of the two suspects, the second one would coordinate the DNA pieces from the wrongdoing scene. A trial in which gel was thrown and hardened, at that point infused with DNA tests and chemicals...
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...Mystery Substance Lab Write-Up The haters always say, “Johnny, you’re bad at chemistry.” Well, this lab proved the haters wrong. Charlie and I were the first in our class to guess the mystery substance correctly, (we hope), and we did it while doing the fewest tests (we think). “That’s a weird brag,” the haters would say. I think they’re just jealous. The goal of this lab was to find out as much as possible about the given mystery substance. Charlie and I did that, and more. As I said earlier, we were even able to identify with almost complete certainty what our substance was: ammonium acetate. In general, Charlie and I tried to be as thorough as possible with the tests without being redundant. For example, since we were certain that the substance was an acetate after doing a number of solubility tests, we decided not to do experiments that tested for a sulfate or something else of that nature. Besides trying to avoid redundancy, we also tried to maintain calm, even when a test didn’t go the way...
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...Kristina Eskola BL 1020 L01 Diffusion and Osmosis Lab Report (Dialysis) Introduction: Dialysis Tubing is a membrane made of regenerated cellulose fibers formed into a flat tube. If two solutions containing dissolved substances of different molecular weights are separated by this membrane, some substances may readily pass through the pores of the membrane, but others may be excluded. We will be investigating the selective permeability of the tubing to reduce sugar, glucose, starch, and iodine potassium iodide. We will test this by placing a solution of glucose and starch into a dialysis tubing bag and then place this bag into a solution of iodine potassium iodide (I2KI). Prediction: The I2KI solution will turn blue when adding Benedict’s reagent. Hypothesis: The solution of water and I2KI will be the most permeable because they will mix and react with Benedict’s reagent and the heat so the cell membrane only allows certain molecules to enter and leave the cell Materials and Methods: In the experiment we will be using two tests. In the first test, we will be using I2KI to test for the presence of starch. When I2KI is added to an unknown solution, the solution will turn purple or black if starch is present. If there is no starch in the solution, it will remain pale yellow. In the second test we will be using Benedict’s test for reducing sugar. When Benedict’s reagent is added to an unknown solution and the solution is heated, it will turn green, orange or orange-red...
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...Lab Report: Water Quality and Contamination Edward Minter Ashford University SCI 207: Dependence of Man on the Environment Lynn Carpenter Aug 10, 2015 Lab Report: Water Quality and Contamination Abstract The theory of common pollutants effects on groundwater was investigated and observed through the method of mirroring the wastewater treatment facilities filtration process. Groundwater quality was examined by testing contaminated elements surged into the water. The experiment study the effects of groundwater by evaluating water quality, water contamination, and quality of drinking water. Water quality is tarnished by pollutants resulting in contamination. Unfiltered ground water displayed the highest level of contamination. When groundwater is treated its quality improves. Dasani and Fiji bottled water preference was used. The data indicates groundwater quality is contaminated by common pollutants. Introduction This lab report explore vinegar, oil, and laundry detergent effects on groundwater. Considering most water contamination doesn’t just happen by itself. Water quality is a human problem because people willing or unwilling participate in the spread of pollution....
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...Group Members: Ariana, Alyssa, Myrjun, Lindsay, Lara Displacement Reactions Lab Report Purpose: To observe and compare single and double displacement reactions. Hypothesis: If a metal element is mixed with an ionic compound, one metal will displace the other to create a new ionic compound. If 2 ionic compounds are mixed together, then the metals will displace each other, creating 2 new ionic compounds. Materials: Goggles, large well plate, steel wool, scoopula, 4 small beakers, dropper, 4 pieces of magnesium ribbon, 4 pieces of zinc metal, 4 pieces of copper wire, copper (II) sulfate solution, zinc nitrate solution, magnesium nitrate solution, sodium carbonate solution and hydrochloric acid. Procedure: Part A: Single Displacement Reactions 1. Clean 4 pieces of magnesium ribbon, zinc metal and copper wire with steel wool until they are shiny. 2. Half-fill one column (three wells) of the well plate with the copper (II) sulfate solution. 3. Half-fill a second column (three wells) with the zinc nitrate solution. 4. Half-fill a third column (three wells) with the hydrochloric acid. 5. In each column, place 1 piece of each metal in different wells (Magnesium in one well, zinc in another and copper in the last). Use a toothpick to keep the metals submerged in the solution. 6. Observe the different reactions in each well. Record your observations in a table. 7. Save the contents of the wells for Part B. Part B: Double Displacement Reactions 1....
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...I Intro In this lab we are going to observe chemical reactions. A chemical reaction is the rearrangement of stuff into new stuff. When a chemical reaction occurs there is color change, temperature change, energy change, gas release, odor, and precipitation. There are 5 different types of chemical reactions: synthesis, decomposition, single displacement, double displacement, and combustion. A chemical reaction has to be balanced because of the law of conservation of mass. Conservation of mass is mass neither created nor destroyed. The product has to be the same amount of substances as the reactants. II Purpose The purpose of this lab is to observe different typed of chemical reactions. III Data / Observations Reaction #1: 2Mg + O2 2MgO Synthesis * Burning magnesium metal turns it into an ultraviolet light while on fire. Product is a white powder. Reaction #2: Mg + HCl MgCl2 + H2 Single displacement * When magnesium was added to HCl, it started to bubble and the test tube became hot. When a flame lit on a wooden splint was added it made a loud pop sound. Reaction #3: (NH4)2 + CO3 (NH4)2 + CO3 Decomposition * Ammonium carbonate was added into a test tube and heated up it up with fire. After adding a piece of litmus paper a strong odor was released. The litmus paper turned from a color pink to a color of blue. Reaction #4: CaCo3 + 2HCl CaCl2 + H2CO3 Double displacement * When HCl was added to calcium carbonate it began...
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...Lab Report 1.2 Separating Components of a Mixture I. Objectives: 1. To know the best way of separating mixtures and substances. 2. To know the some ways of separating mixtures and substances. II. Materials: STATION 1 * White sand * Clean bottle * Rice grains * Spoons * Rags * Strainers STATION 2 * A glass of water * Table esalt * Alcohol lamp * Matches * Clean bottles * Stirring rods * Small beakers * Biscuit can cover * Tripod * White Sand * Rags STATION 3 * Ground charcoals * Rags * Iron filings * Magnet * 2 clean cups * Stirring rods III. Procedures: STATION 1 1. Examine each sample of sand and rice grains. 2. Name some properties of each sample. Prepare a data table for observations. 3. Put a tablespoon each of the sand and rice grains in a clean bottle and stir. 4. Again observe the properties of sand and rice grains and note down any changes. 5. Describe some methods for separating sand from rice. 6. Try the method that your group thinks is the most efficient. 7. Describe your results. STATION 2 1. Examine samples of water, sand and table salt. 2. Name some properties. 3. Fill a small beaker with water. 4. And in small propertions,half a spoon of salt, stirring the water after each addition. 5. Compare the appearance of salt before and after adding it to water. 6. Apply heat to the beaker and observe...
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...Jonte Berry LAB 3 REPORT SHEET – ACIDS, BASES, INDICATORS, pH Procedure Number 3 Estimated pH with pH paper Vinegar (Ph 2) Soap + H2O (Ph 6) Tap water (Ph 8) Baking soda + H2O (Ph 9) Ammonia (Ph 13) 4 What color is your “red cabbage solution” when diluted with tap water? (The water turns ruby red) Do you think we will all have exactly the same color? Explain your answer. (No) 5 Solution color Estimated pH with cabbage indicator with cabbage indicator Vinegar (Light pink) (Ph 4) Soap + H2O (Clear Pink) (Ph 4) Tap water (Light blue) (Ph 10) Baking soda+H2O (Light light blue) (Ph 10) Ammonia (Clear) (Ph 10) 6 Describe what happened to the color of the solution when you mixed the vinegar and ammonia solutions. What do you estimate the pH of the solution to be with pH paper? (The pink color from the vinegar changes to light blue when the ammonia was added.) What do you estimate the pH of the solution to be with the cabbage indicator? (Ph 10) 7 What happened when you added the baking soda solution to the mixture of vinegar/ammonia? Describe your observations. (When I added the baking soda solution nothing happen at all.) What do you estimate the pH of the solution to...
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