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Mystery mixtures
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People don’t know how hard it is to find the properties of a mysterious mixture. Well, a group of 8th graders decided to find out. They tested possible substances by mixing them together. When they added water, the result was fizzing and bubbling. After a lot of testing and comparing, they thought the mystery mixture was Citric Acid and Baking Soda. They thought it was Citric Acid and Baking Soda because of the physical and chemical properties. The mystery mixture and the combination were both compact and had small orbs. They both had a fine and sandy feel. Their chemical properties also looked a like. They fizzed with small-medium sized bubbles. Their bubbling time was also very close at 3 minutes. They also had a close temperature. The
mystery mixture had 15.5Oc and the Citric Acid, Baking Soda combination had 16.6Oc. Another group thought the mystery mixture was Baking Soda, Citric Acid, and Epsom Salts. They thought it was this mixture because of the similarities in physical properties.The mystery mixture had clumps that looked like epsom salts. But they changed because the length of fizz was much shorter with a time of about 1 minute and forty seconds. The temperature was 17.9Oc All of this data concludes that the mystery mixture is a combination of Citric Acid and Baking Soda. The reason the class thought it was this combination was because of the similarities in physical and chemical properties. Both mixtures had the same appearance and texture. Both fizzed for the same amount of time. So, because of the similarities, they concluded that the mystery mixture was Baking Soda and Citric Acid.
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
Anne Zhang 3/6/14 BSGE 7-1 Lab Report Problem Paragraph 1 Question: What is the effect of temperature on the dissolving time of an Alka-Seltzer? Alka-Seltzer is made up of baking soda, aspirin, and citric acid which gives the tablet the fizz when dropped in any temperature water. “Alka-Seltzer is a medication that works as a pain reliever and an antacid.
The primary goal of this laboratory project was to identify an unknown compound and determine its chemical and physical properties. First the appearance, odor, solubility, and conductivity of the compound were observed and measured so that they could be compared to those of known compounds. Then the cation present in the compound was identified using the flame test. The identity of the anion present in the compound was deduced through a series of chemical tests (Cooper, 2009).
A: According to the observations in the table above, I have concluded that icing sugar is the mystery powder. From the very beginning of the experiment it was narrowed down to two substances, icing sugar and cornstarch. It was concluded to be those two because the physical appearance and the texture only matched with icing sugar and cornstarch. The two main factors of finding the mystery powder was the reaction with water and vinegar.
The purpose of conducting experiment was to determine the identity of white compound. Based on the 5 gram of unknown white compound several experiment conducted including solubility test, pH test, flame test, and ion test. Several materials including chemicals used throughout experiment and will be described through paragraphs.
A condenser and heat reflux was used to prevent reagents from escaping. Then the solid product was vacuum filtered. The product was recrystallized to purify it and the unknown
The objective of this experiment will be to combine various substances, liquids and metals, and to observe their behavior when they are combined. The types of reactions observed shall determine the nature of these reactions: physical or chemical.
Our first goal in Project 7 was to determine what our three unknown solutions were. We did this through a series of tests. Our first test was a series of anion tests. We performed anion tests to determine whether any of the following anions were present in our solution: chloride, sulfate, nitrate, carbonate, and acetate. Our first solution, labeled as B, had only the chloride test come out positive. The next solution, C, tested positive for acetate, as did our last solution, E. We next performed anion tests. These included flame test, as well as an ammonium test. For the flame test, certain cations turn flames different colors, so we used this knowledge to test to see which cations could be present in our solutions. During this test, the only solution that appeared to turn the flame any color was solution C, which turned the flame bright orange, indicating the sodium ion was present. This led us to the conclusion that solution C was sodium acetate. We next performed an ammonium test, which involved mixing our solutions with sodium hydroxide, and smelling the resulting solution in order to detect an ammonia smell. Solution B was identified as smelling like ammonia, indicating the presence of the ammonium cation. From this, we identified solution B as ammonium chloride. We next checked the pH of all three of the solutions, first by using litmus paper. Solution C was slightly basic, solution E and B were both acidic, with a pH around 4. Since we knew that solution E had acetate, and was acidic, and did not turn the flame any color, we determined it was acetic acid, as none of the ions in acetic acid would turn a flame any color.
Here is how I did my experiment. First I formed my hypothesis, and I thought about how I should go about doing it. I decided to use Vinegar (Acetic Acid) and Baking Soda (Sodium Bicarbonate). I used these because they are the basic and well known chemicals used in the "Volcano" project, which is a bubbling, fizzing foam caused by mixing almost any amount of vinegar and baking soda. I first used any amount for a test, in this case it was a one to one ratio.
The Effect of Temperature on the Rate of Reaction Between Hydrochloric Acid and Calcium Carbonate
Identifying Five Unknown Chemicals I was given 5 unknown samples, which are sodium chloride, sodium thiosulfate, calcium carbonate, sodium bicarbonate and sodium nitrate and these samples are all white and solid. However, I don’t know which substance is which sample and I was only given some information about the physical and chemical properties of these substances. In order to identify the 5 unknown samples, knowing which sample is which substance, I have to carry out this experiment, finding out the chemical and physical properties of these samples. How can we identify five unknown chemical samples that seem to look the same?
Our claim that bouncing bubbles is a physical reaction because there was a mixture where no new substance is created, but there is 2 or more compounds making up the mixture. There is no new state of matter, no new color, nor a new smell, did change temperature based on average of all, didn’t produce gas, and didn’t produce light. Also the experiment did not create a gas or produce light. When we put the 10 ml of Dawn dish soap, 30 ml of water, and 1 ml of Glycerine together many things changed that were physical because it is a mixture not a chemical change so our claim is true. The volume is 41 ml so didn’t react to form a new substance or add any volume when mixed them together except for the bubbles when stirred they were created but that can happen without mixing if you have ever washed hands you produce bubbles when you touch the water because the soap reacts with the water to make bubbles which is a physical change because it is just a mixture didn’t change anything really.The smell did not change because the Glycerin and water did not a have a smell while the dish soap did making the mixture smell like that.
What does happen when you mix vinegar and baking soda? While your immediate answer may be "it fizzes and turns white" there is much science behind the concept. You will find that what it "looks like" is not nearly everything behind what really happens. Baking soda and vinegar form a completely different compound (when two or more elements combine; broken down by chemical changes like adding energy as heat or an electric current), which has it’s own properties. From the particle model of matter to the way that a chemical reaction is represented in an equation, the answer is definitely complicated.
If I'm going to mix vinegar and baking soda together, will it be a mixture or a compound? Now, vinegar will be the solvent because it will be the substance that the solute will be dissolving in. Of course, the solute is baking soda, or the substance that will be put inside the larger substance. When I mixed them together, bubbles started forming and rising. What happened? Did a reaction happen? How do we know? Here is the chemical formula of the mixture: NaHCO3 + CH3COOH ----> CO2 + H2O + Na+ + CH3COO-. As you can see, the molecules of the reactants: vinegar and baking soda, are found in the product. This means that the molecules and atoms in the reactants had rearranged and reform to make the new product. The acetic acid in vinegar reacts with the carbon dioxide to form sodium acetate and carbonic acid. The carbonic acid will then go under a decomposition reaction and for carbon dioxide. Since the carbonic acid had went through a reaction and turned into a gas, which leaves the sodium acetate solution. How do we know that carbon dioxide is formed? Well, the bubbles that come out during the reaction are the carbon dioxide escaping the solution as a gas.
Baking soda is used to make a mixture rise and therefore as a base it reacts with an acid to get co2 gas, water and salt. This reaction takes place once the mixture has been mixed properly. The co2 gas bubbles rise in the oven at 80 C and gives a light spongy texture. If you decide to wait after you have mixed the ingredients the mixture may fail to rise and ruin your recipe.