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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The rock in a lead ore deposit contains 89 % pbs by mass. how many kilograms of the rock must be processed to obtain 1.5 kg of pb?
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Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt
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The table lists the lattice energies of some compounds. compoundlattice energy (kj/mol)lif –1,036licl –853naf –923kf –821nacl –786which statement about crystal lattice energy is best supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf. the lattice energy increases as the cations get larger, as shown by lif and licl. the lattice energy decreases as cations get smaller, as shown by nacl and naf. the lattice energy decreases as the cations get smaller, as shown by naf and kf.
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