Chemistry
Chemistry, 18.03.2021 02:50, robertobi1988

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 theliquid water can be frozen back into an ice cube. Chemical changes, on the other hand, are notreversible: 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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