The purpose of this experiment was to test the tonicity of potato cells. The potato cells were placed in different test tubes with water and were left there for 15 minutes. The percent change in mass is then used to determine if the cells lost or gained water‚ therefore determining the tonicity of the cell. Although it was a brief short time‚ the final results showed that the more water the potatoes were placed in‚ the more hypotonic the potato becomes. Tonicity is stated to be the state of a solution
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Determination of Water in a Hydrate DESIGN – Aspect 1: Defining the problem & selecting variables Research Question: What percentage of Copper Sulfate Hydrate is water? Background Information: There are many ionic compounds that contain one or more waters of hydration in their formulae. They exists either in anhydrous or hydrated form. Most anhydrous compounds have a strong tendency to absorb water from the humidity in the atmosphere and shifts into a hydrated form. Because of
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Can salt change water’s density? I conducted an experiment using common household items to find an answer to my question. The procedure involves filling two cups with two hundred fifty milliliters of water. Then‚ mixing teaspoons of salt in water one at a time‚ until you’re able to submerge a raw egg in the solution and have it float up. My hypothesis is‚ salt does infact change water’s density‚ and if the egg floats it’s proof of density change in the water‚ because it must be less dense than the
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out the Sand: 3. Separating out the Benzoic Acid: 4. Separating out the Salt: Grams Percent of Mixture Weighing Dish 0.5 .5/6 * 100= 8.3% 10cm Paper 0.6 .6/6 * 100= 10% Iron 1.9 1.9/6 * 100= 31.7% Sand 1.1 1.1/6 * 100= 18.3% Benzoic Acid 0.5 .5/6 * 100= 8.3% Salt 1.4 1.4/6 * 100= 23.4% Total 6.0 100% Questions: 1. How did your proposed procedures or flow charts at the beginning of this experiment compare to the actual procedures of this lab exercise? I had to change
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Hot water And Cold Water Advantages and Disadvantages The main purpose of drinking any liquid‚ water in particular‚ is to hydrate our body. Either hot or cold water will serve this purpose. Obviously‚ cold water sounds more tempting than hot water. There is some evidence to suggest you can benefit from some extra calories being burned by drinking cold water. The body has to regulate its temperature to around 98.6 degrees. Drinking cold water forces the body to work a little harder to bring the temperature
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a tremendous variety of oxidation states that appear in its compounds. The oxidation numbers range from Mn (III) in compounds like Mn(NO)3CO to Mn (VII) in KMnO4. Compounds of manganese range in oxidation number between theses two extremes. This experiment involves the preparation of a Mn (III) complex of actylacetone (also named 2‚4-pentanedione) which is a useful starting material for the preparation of other Mn (III) compounds. Manganese (III) complexes are relatively stable and can be prepared
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Topic 6 Water Quality and Water Management What determines water quality? Drinking water should be colorless‚ odorless and flavorless; this means that there are no organisms and sediments in the water‚ but it does not mean that if your drinking water look‚ smells and taste clean‚ that does not mean that there is nothing else it. Water also contains dissolved solids: •Sulfur •Calcium •Magnesium If water contains a lot of dissolved calcium and magnesium it is called hard water
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fastest in tap water‚ warm water‚ cold water‚ salt water‚ or acidic water. In this lab I wall develop and test a hypothesis‚ analyze data and draw a conclusion. In this experiment I will find out that in a type of water the Alka-Seltzer will dissolve faster and slower. Alka-Seltzer is one of the world’s best known antacids. Its main function is to absorb excess stomach acid. II. MATERIALS: * Tap Water - Warm Water * Cold Water - Salt Water * Acidic Water -5 cups (250 mL
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The milgram experiment. The three people involved were: the one running the experiment‚ the subject of the experiment a volunteer‚ and a person pretending to be a volunteer. These three persons fill three distinct roles: the Experimenter an authoritative role‚ the Teacher a role intended to obey the orders of the Experimenter‚ and the Learner the recipient of stimulus from the Teacher. The subject and the actor both drew slips of paper to determine their roles‚ but unknown to the subject‚ both slips
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------------------------------------------------- ------------------------------------------------- 1. What is the dependent variable for this experiment? ------------------------------------------------- The dependent variable is the concentration (solute) of the potato. ------------------------------------------------- ------------------------------------------------- 2. What is the independent variable for this experiment? ------------------------------------------------- The independent variable is the concentration (solute)
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