Chemistry, 29.07.2019 19:30, Random4422

An engineer is designing a process to cool hot water from a power plant before returning the water to the environment. his plan is to allow the hot water to flow past a pipe containing a solution that is undergoing a chemical reaction. the chemical reaction will be able to remove some of the water's heat through the metal pipe. which of the following reactions could take place inside the cooling pipe to remove heat from the hot water? a. c + o2 → co2 + heat b. cacl2 → ca2+ + 2cl- + heat c. nh4cl + heat → nh4+ + cl- d. n2 + 3h2 → 2nh3 + heat

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Analysis of the set of options:

A. C + O2 → CO2 + heat

The heat on the right side means that the reaction release (yields) heat. This is an exothermic reaction. Relasing heat means that the surrondings will receive an extra amount of heat as consequence of the reaction, so this reaction is not suitable to the target of cooling hot water.

This is a wrong choice.

B. CaCl2 → Ca2+ + 2Cl- + heat

This is the same situation explained above. An exothermic reaction which will increase the temperature of the water instead of cooling it.

Wrong choice.

C. NH4Cl + heat → NH4+ + Cl-

This is the right choice.

The heat shown in the side of the reactants means that the reaction uses (absorbs) heat. Where from will the reaction absorb this heat? From the surroundings which include the hot water. In conclusion, the reaction will use heat from the hot water consequently cooling it.

D. N2 + 3H2 → 2NH3 + heat

The very same case of the first two options. Wrong choice, because it iis an exothermic reaction which will increase the temperature of the surroundings.

answered: Guest

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

answered: Guest

Idon't know hope someone you

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