Biology

Biology, 09.07.2019 03:40, jerrygentry3411

An increasing salt content in the oceans of the world is a good example of 1) one-way change 2) reversible change 3) cyclical change 4) repetitive change

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Chemistry, 21.07.2019 06:00, kodaxmodz

While studying chemical and physical changes, students added salt to a glass of water. they stirred the salt until it dissolved and could no longer be seen. "that's a chemical change," sarah stated. do you agree? explain. a) yes, it is a chemical change because something new is formed. b) no, it is a physical change. it is salt and water and you can get the salt back by boiling off the water. c) yes, it is a chemical change because there was a change in the appearance of one of the components, the salt. d) no, it is a physical change. a chemical change cannot occur when you mix two compounds together like salt, nacl, and water, h2o, without adding heat.

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Henry mixed salt and water together in a cup until he observed a clear solution. he measured the mass of the solution. then he placed the cup outside for several sunny days during the summer. after a week, he observed that only solid salt remained in the cup and the mass had decreased. henry concluded that a physical and chemical change occurred in this investigation. which statements correctly defend or dispute his conclusion? 1. he is correct dissolving salt in water is a physical change, but evaporating the water is a chemical change. formation of a solid is evidence that a chemical change occurred. 2. he is correct evaporation is a physical change, but dissolving salt in water is a chemical change. the change in mass is evidence that a chemical change occurred. 3. he is incorrect dissolving salt in water and evaporation of the water are both physical changes. the reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change. 4. he is incorrect dissolving salt in water and evaporation of the water are both chemical changes. the reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.

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Chemistry, 29.07.2019 12:30, Isaac0213

Henry mixed salt and water together in a cup until he observed a clear solution. he measured the mass of the solution. then he placed the cup outside for several sunny days during the summer. after a week, he observed that only solid salt remained in the cup and the mass had decreased. henry concluded that a physical and chemical change occurred in this investigation. which statements correctly defend or dispute his conclusion? he is correct. dissolving salt in water is a physical change, but evaporating the water is a chemical change. formation of a solid is evidence that a chemical change occurred. he is correct. evaporation is a physical change, but dissolving salt in water is a chemical change. the change in mass is evidence that a chemical change occurred. he is incorrect. dissolving salt in water and evaporation of the water are both physical changes. the reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change. he is incorrect. dissolving salt in water and evaporation of the water are both chemical changes. the reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.

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Chemistry, 04.08.2019 04:00, smolemily

Henry mixed salt and water together in a cup until he observed a clear solution. he measured the mass of the solution. then he placed the cup outside for several sunny days during the summer. after a week, he observed that only solid salt remained in the cup and the mass had decreased. henry concluded that a physical and chemical change occurred in this investigation. which statements correctly defend or dispute his conclusion? 1- he is correct. dissolving salt in water is a physical change, but evaporating the water is a chemical change. formation of a solid is evidence that a chemical change occurred. he is correct. evaporation is a physical change, but dissolving salt in water is a chemical change. the change in mass is evidence that a chemical change occurred. 2- he is incorrect. dissolving salt in water and evaporation of the water are both physical changes. the reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change. 3- he is incorrect. dissolving salt in water and evaporation of the water are both chemical changes. the reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.

Answers: 1

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An increasing salt content in the oceans of the world is a good example of 1) one-way change 2) reve...

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