Which is the correct Lewis dot structure of NH2-?
2 answers:
Answer: The correct answer is Option D.
Explanation:
Lewis dot structures are the structures which represent the valance electrons of an element forming a compound. The electrons are represented as the dots.
In a compound, the bonded electrons are represented as a bond and lone pair of electrons are represented as dots.
In compound,
Electronic configuration of Nitrogen:
Valence electrons in nitrogen = 5
Electronic configuration of hydrogen:
Valence electrons in hydrogen = 1
In the given compound, bond pairs are 2 which means number of electrons bonded are 4.
Unbonded electrons left on nitrogen will be 3 and this compound has an extra electron because of the negative charge present on the compound. Hence, total unbonded electrons present on this compound will be 4.
Therefore, the lewis dot structure will be Option D.
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Answer:
The bismuth sample.
Explanation:
The specific heat of a substance (might not be a metal) is the amount of heat required for heating a unit mass of this substance by unit temperature (e.g.,
.) The formula for specific heat is:
,
where
is the amount of heat supplied.
is the mass of the sample.
is the increase in temperature.
In this question, the value of (amount of heat supplied to the metal) and
(mass of the metal sample) are the same for all four metals. To find
(change in temperature,) rearrange the equation:
,
.
In other words, the change in temperature of the sample, can be expressed as a fraction. Additionally, the specific heat of sample,
, is in the denominator of that fraction. Hence, the value of the fraction would be the largest for sample with the smallest specific heat.
Make sure that all the specific heat values are in the same unit. Find the one with the smallest specific heat: bismuth (.) That sample would have the greatest increase in temperature. Since all six samples started at the same temperature, the bismuth sample would also have the highest final temperature.