Chemistry, 19.03.2021 19:10, CoolRahim9090

A 25.0 mL sample of water is at 30.0 degrees Celsius. a piece of metal is added to the sample of water and the tempature of the water decreases to 20.0 degrees Celsius. which of the following statements could be true about the piece of metal? awnsers:
1. the initial temlature of the metal was 10.0 degrees Celsius
2. the initial tempature of the metal was 20.0 degrees Celsius
3. the initial tempature of the metal was 30.0 degrees Celsius
4. the initial tempatuee of the metal was 40.0 degrees Celsius

Answers: 3

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answered: Guest

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answered: Guest

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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answered: Guest

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

answered: Guest

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A 25.0 mL sample of water is at 30.0 degrees Celsius. a piece of metal is added to the sample of wat...