Chemistry, 18.03.2021 02:50 kimjooin02
Is the author of the article suggesting that there are exceptions to the general indicators of chemical or physical changes? Which selection from the article BEST supports your answer? (A)Yes; Physical changes in matter are reversible: An ice cube can melt into liquid water, and then the liquid water can be frozen back into an ice cube. Chemical changes, on the other hand, are not reversible: A log burned in a fire turns to ashes, but the ashes cannot be changed back into a log. (B)No; Sometimes it is difficult to tell if a chemical reaction has taken place. To help determine whetherthere has been a reaction, chemists consider the basic indicators that a reaction has occurred, such asa change in temperature, a change in color, the development of an odor, the formation of a precipitate, or the formation of a gas.(C)Yes; In the case of table salt, it dissociates into sodium ions and chloride ions in the water, which wouldseem to be a chemical change. However, scientists do not consider this to be a chemical changebecause the solid table salt remains after the water is evaporated. The table salt dissociated, but theatoms recombine into the same arrangement once the water is removed.(D)No; Remember that a physical change is a change in properties such as texture, shape or state, while achemical change represents the formation of a new substance after atoms are rearranged in a chemical
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Chemistry, 21.06.2019 22:30
Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?
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Chemistry, 22.06.2019 02:30
When you perform this reaction, what could remain at the end of the reaction? check all that apply. excess reactant aqueous copper chloride excess reactant aluminum oxygen product solid copper carbon dioxide product aqueous aluminum chloride water
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Is the author of the article suggesting that there are exceptions to the general indicators of chemi...
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