the milk into curd. Curd can also be obtained by coagulating milk with an edible acidic substance‚ vinegar in this case‚ and then draining off the liquid portion‚ which is the whey. During the heating process‚ the curd is separated from the liquid‚ which is the whey. The heat helps to speed up the separation process. The curds will then dry to form casein‚ which also acts as an adhesive. The vinegar is acidic‚ and so it curdles the solids so they can be separated from the whey‚ and the baking soda
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1. Define Mineral: Any naturally occurring inorganic solid that possesses an orderly crystalline structure and can be represented by a chemical formula. 2. Use the geologic definition of a mineral to determine which of the items listed in Figure 1.1 (p.3 lab book) are minerals and which are not minerals. Put an “X” in the appropriate box. Yes | No | Mineral | Yes | No | Mineral | | X | Rock Candy | | X | Obsidian | X | | Quartz | | X | Cubic zirconia | | X | Motor oil |
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Determining Acids and Bases With Homemade pH Indicator Strips Made With Red Cabbage Juice Period 0 IB Chemisty Annie Truong Ms. Tran Purpose: The purpose of this lab is to make homemade pH indicator strips using red cabbage juice as the main ingredient and estimate the pH of different substances with these strips. Background Information: Acids and bases have properties of modifying the color of certain substances. The juice of the red cabbage is a blue-violet color and when it comes in
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Acids & Bases: Reactions‚ Standardizations‚ & Titrations Experiments 21 & 22 Experimental Overview: The procedure for this experiment was carried out as instructed in the laboratory manual‚ Experiments in General Chemistry‚ 4th ed.‚ S.L. Murov‚ Experiment 21‚ Acids and Bases: Reactions and Standardizations‚ and Experiment 22‚ Acids and Bases: Analysis. There were modifications made by the instructor to dilute the 6M NaOH to 0.1M in 300mls
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Exothermic reactions give off heat‚ for example‚ fireworks. Endothermic reactions absorb heat; heating water on a stove thus the water turns into gas. Prediction/Hypothesis: If water is combined with ice or salt then it absorbs energy. If white vinegar is combined with baking soda or steel wool‚ then it gives off energy. If hydrogen peroxide is combined with dry yeast‚ then it absorbs energy.
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weigh out 6 15.0g (15.0ml) samples of a 3% H2O2 (l) solution in test tubes. Using the same scale as before‚ weigh out 3 3.0g samples of baking soda on parchment paper and 3 3.0g samples of vinegar in 3 beakers. Mix the 3 samples of Baking soda with 3 of the samples of H2O2 (l) and mix the 3 samples of vinegar with the other sample of baking soda. Put rubber stoppers on the test tubes and mix/stir all 6 solutions. Be cautious of the Baking soda solution as they may produce CO2 (g) when shaken so
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Analysis of Vinegar Solution | Sample 1 | Sample 2 | Sample 3 | Quantity of Vinegar taken | 5.00 mL | 4.95 mL | 5.10 mL | Initial NaOH buret reading | 4.00 mL | 0.00 mL | 1.55 mL | Final NaOH buret reading | 47.5 mL | 41.00 mL | 47.40 mL | Volume NaOH used | 43.50 mL | 41.00 mL | 45.85 mL | Molarity of Vinegar | .831 M | .791 M | .859 M | Mean molarity of Vinegar and average deviation | .827 M | % by mass acetic acid present | 4.96% | Questions: 1. Commercial vinegar is generally
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The bone sample has been soaking in vinegar with a pH of about 3.0 for a little over a week. The exterior of the bone remained intact the entire time. Once I removed the bone‚ I realized that the interior integrity of the bone was compromised. Now that the bone was exposed to the acid for such a long period of time‚ it was more flexible. The reason the long bone became so bendable is because the bone is largely made up of calcium salts. The vinegar broke the calcium phosphate down‚ leaving only collagen
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Amanda Ayers 09/07/2013 Title: Observations of Chemical Changes Purpose: To observe some properties of chemical reactions and associate them with everyday household cleaning products. Procedure: In order to complete this experiment‚ I had to set up and organize my lab table. I used my 24-well plate‚ my 96-well plate‚ and the first experiment bag which included all of the necessary chemicals. I also had to gather 3 household cleaning products and a pipet in order to test them as well
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heat energy is still energy. 5. Over time crusty scales form on the heating coil inside a kettle. These can be removed by covering it with vinegar. As the scales disappear‚ bubbles of gas are observed. Is this a chemical change or a physical change? Using vinegar to take off crusty scales is an example of a chemical change. This is because when using vinegar a new substance is formed. In this case the new substance is a gas. Another reason why we know that it is a chemical change is because bubbles
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