Law

Law, 16.11.2019 23:31, genyjoannerubiera

Describe one physical property and one chemical property for which a forensic scientist might analyze a sample. specify the type of tools/equipment that would be required.

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Chemistry, 12.07.2019 18:30, ddssssssdddddd

4. in order to decide whether a property is chemical or physical, you must know whether a. chemical or physical changes occur when the property is measured b. the property is extensive or intensive c. the property is intrinsic or extrinsic d. the property involved energy or matter

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Chemistry, 27.07.2019 21:20, mathman783

Afuel scientist burnt a piece of coal and a piece of wood to compare the amount of heat given off by each. which is the correct match of the type of change happening and the property being tested during the process? physical change; chemical property flammability physical change; physical property of flammability chemical change; physical property of heat of combustion chemical change; chemical property of heat of combustion

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Chemistry, 27.09.2019 11:30, Raymond123

1. in this experiment, what property of nacl is used to separate it from the other two components? is this a chemical or physical property? nacl is the only compound in this mixture that is soluble in water, so its solubility in water is the property used to separate it. this is a physical property, because you are doing nothing to change the actual chemical composition. it's just solvated by water. 2. in this experiment, what property of caco3 is used to separate it from sio2? is this a chemical or physical property? the property of caco3 used to seperate it from sio2 is its reactivity with acetic acid. by adding the acetic acid, you develop carbon dioxide (which bubbles out of solution), and cacl2, which is soluble in water. you are undergoing a chemical reaction, so this is a chemical property. 3. an unknown sample of a mixture of salt and sand weighs 7.52 g before washing with water and 3.45 g after. what is the percent of sand in the sample? (show all work.) 7.52g salt and sand, 3.45g sand, 4.07g salt (the difference in before and after water shows how much salt you had) 3.45 g sand / 7.52g total * 100 = 45.9% sand to check that this is correct, find the percentage of salt as well. 4.07g salt / 7.52g * 100 = 54.1% salt 45.9% + 54.1% = 100%. everything is accounted for, so this must be the composition of the mixture.

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