Chemistry, 28.07.2019 05:30 liv5779

Imagine two tasks that would involve a chemical reaction of some sort. for one , measurement isn't all that critical . for the other careful stoichiometry and laboratory process is essential. identify and describe two tasks (projects , operations, devices, etc) that differ in this way,

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Answer from: nadia74

1. When measuring chemicals in the chemistry laboratory, one can easily recognize if the measurement to be made is critical or not by looking at the instructions that are given. For measurements that are not all that critical, words such as 'approximately or about' are often used when their measurement is been talked about.
For a measurement that is not critical, a good example is when one is adding a particular salt to a solution, so that the crystals of the salt will be formed. All that one have to do in this case, is to use a spatula to scoop salt and pour it inside the salt solution until one observe the formation of free crystals.

2. An example of a chemical reaction that needs careful measurement of reagents is one that involves mixing of two chemicals in order to observe the chemical and the physical change that will occur. In this case, careful measurements have to be made in order to get valid results. A good example of this is when acid and base are titrated against each other in the presence of indicator in order to determine the equivalent point. In this case, precise measurement has to be taken in order to determine the concentration of either the acid or the base.

Answer from: Quest

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is $1s^{2}2s^{2}2p^{6}3s^{1}$ and electronic configuration of phosphorous is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$ .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

$3na + p \rightarrow na_{3}p$

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

Electrons are transferred from atoms of to atoms of this transfer makes the sodium atoms and the

Answer from: Quest

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