Chemistry

Chemistry, 03.08.2019 22:30, barstr9146

Substances undergo chemical reactions, which keep the same properties as the original substance

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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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Chemistry, 15.07.2019 17:30, lananamr

Imagine an experiment in which hydrogen peroxide decomposes to form water and oxygen gas. hydrogen peroxide> water+oxygen gas which of the following processes could be used to show that this reaction obeys the law of conservation of matter a. show that the mass of water produced is more than the mass of oxygen produced b. show that the mass of water produced plus the mass of oxygen produced are together equal to the original mass of hydrogen peroxide c. there is no way to show that the law of conservation is supported. 2. when an acid and a base react, they form new substances compare the new products with the original substances. original substance(acid+base) > new substances a. the chemical and physical properties of the new substances are different from the properties of the original substances b.the chemical and physical properties of the new substance are the same as the properties of the original substances c. the chemical properties of the new substances are the same but the physical properties are different d. the physical properties of the new substances are the same but the chemical properties are different.

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Chemistry, 13.09.2019 03:10, alyxkellar06

Which statements below are an appropriate hypothesis in response to this question? check all that apply. if a substance changes state of matter (e.g., liquid to gas), then this is a physical change because the original properties of the substance have not changed. if a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed. if a substance undergoes a chemical change, then it will not retain its original properties because a new substance is formed. if a precipitate is formed when two substances are mixed, then a chemical change has taken place because precipitates are new substances.

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Chemistry, 30.09.2019 20:20, Dracopaul03

This lab question is: how can you distinguish a physical change from a chemical change? which statements below are an appropriate hypothesis in response to this question? check all that apply. if a substance changes state of matter (e.g., liquid to gas), then this is a physical change because the original properties of the substance have not changed. if a substance undergoes a physical change, then it will retain most of its original properties because no new substance is formed if a substance undergoes a chemical change, then it will hot retain its original properties because a new substance is formed if a precipitate is formed when two substances are mixed, then a chemical change has taken place because precipitates are new substances.

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