Chemistry, 06.10.2019 06:00 nahimi

The specific heat of nickel is 0.44 j/g*⁰c. how much energy needed to change the temperature of 95.4g of nickel from 22⁰c to 32⁰c. is the energy absorbed or released?

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To determine the heat or energy needed for the process, we use the equation,
H = mcpdT
where m is the mass, cp is the specific heat and dT is the temperature difference.
H = (95.4g)(0.44 J/g°C)(32°C - 22°C)
= 419.76 J
Thus, the amount of heat that should be ABSORBED is approximately 419.76 J.

Answer from: jamarstand

Answer : The amount of energy needed is, 419.76 J and the energy is absorbed.

Solution :

Formula used :

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

where,

Q = heat gained or absorbed = ?

m = mass of nickel = 95.4 g

c = specific heat of nickel = 0.44J/g^oC

$\Delta T=\text{Change in temperature}$

$T_{final}$ = final temperature = 32^oC

$T_{initial}$ = initial temperature = 22^oC

Now put all the given values in the above formula, we get

$Q=95.4g\times 0.44J/g^oC\times (32-22)^oC$

Q=419.76J

The value of Q is positive that means energy is absorbed.

Therefore, the amount of energy needed is, 419.76 J and the energy is absorbed.

Answer from: Quest

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence, the electronegativity (or the ability to attract electrons) is lessened."

Answer from: Quest

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

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The specific heat of nickel is 0.44 j/g*⁰c. how much energy needed to change the temperature of 95.4...

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