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Health, 18.07.2019 00:00, Teephat

Where is information about substances kept?

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Chemistry, 29.06.2019 19:30, joejoefofana

Pure sodium metal explodes when it makes contact with water, and chlorine, in its natural state, is a deadly, poisonous gas. when these two chemicals combine, they form a harmless, white powder known as sodium chloride or table salt. which of the following statements does this information support? a. when substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances. b. heat must be added in order to change the chemical properties of substances. c. when substances are chemically combined, the properties of the new substances that are formed are the same as the properties of the original substances. d. the properties of substances change during chemical reactions but then later go back to their original condition.

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Biology, 08.07.2019 18:30, avaleasim

Ou are given two jars, each of which contains an unknown substance. you are asked to determine if the substances are different from one another or if each jar contains the same substance. what should you do to complete this task? question 10 options: compare the physical states of the substances. if the substances are in the same state, then they are the same. compare both the physical and the chemical properties of the substances. if the substances perform the same in a variety of tests, then they are the same. compare the appearances of the substances. if the substances look the same, then they are the same. compare only the physical properties of the substances. if the substances have the same density or melting point, then they are the same.

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Chemistry, 09.07.2019 19:00, kimmosley80

You are given two jars, each of which contains an unknown substance. you are asked to determine if the substances are different from one another or if each jar contains the same substance. what should you do to complete this task a. compare the physical states of the substances. if the substances are in the same state, then they are the same. b.compare the appearances of the substances. if the substances look the same, then they are the same. c.compare both the physical and the chemical properties of the substances. if the substances perform the same in a variety of tests, then they are the same. d.compare only the physical properties of the substances. if the substances have the same density or melting point, then they are the same.

Answers: 1

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Chemistry, 28.10.2019 20:31, yoyo0123

Sahil watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. the ending substances did not look the same as the starting substances. sahil was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. he created a model of the repeating groups of atoms that might make up the two ending substances. does his model correctly show why the properties of the ending substances are different from the properties of the starting substances? describe what could be correct or incorrect about his model.

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