Chemistry
Chemistry, 07.07.2019 20:50, teed0ll9

Is a click heat pad a chemical or physical change?

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Chemistry, 05.07.2019 18:00, jacobd578
Which statement describes one of the main differences between a physical and a chemical change? a chemical change involves reactants and products, whereas a physical change involves only reactants. a physical change is a change of state, whereas in a chemical change the substance keeps the same form. a physical change brings about a different form of the same substance, whereas a chemical change forms a different substance. a chemical change caused by adding or removing heat energy can usually be reversed, whereas a physical change can generally not be reversed.
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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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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, 21.08.2019 07:30, Niktorres560Luckynik
Which pair correctly identifies the activity with the appropriate type of change it undergoes? a. ice melting is an example of a chemical change. b. heat releasing is an example of a physical change. c. jewelry tarnishing is an example of a chemical change. d. metal corroding is an example of a physical change.
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