Answer:
The specific heat of iron is 0.45 J/g.°C
Explanation:
The amount of heat absorbed by the metal is given by:
heat = m x Sh x ΔT
From the data, we have:
heat = 180.8 J
mass = m = 22.44 g
ΔT = Final temperature - Initial temperature = 39.0°C - 21.1 °C = 17.9°C
Thus, we calculate the specific heat of iron (Sh) as follows:
Sh = heat/(m x ΔT) = (180.8 J)/(22.44 g x 17.9°C) = 0.45 J/g.°C
which of the following elements has properties different than the rest?
Ac
Co
Cu
Sc
Answer:
Ac
Explanation:
Answer:
The answer is a
Explanation:
Ac
based on slater's rule, what is the shielding constant experienced by a valance d- electron in a copper atom
Answer:
The general principle behind Slater's Rule is that the actual charge felt by an electron is equal to what you'd expect the charge to be from a certain number of protons, but minus a certain amount of charge from other electrons. Slater's rules allow you to estimate the effective nuclear charge Zeff from the real number of protons in the nucleus and the effective shielding of electrons in each orbital "shell" (e.g., to compare the effective nuclear charge and shielding 3d and 4s in transition metals). Slater's rules are fairly simple and produce fairly accurate predictions of things like the electron configurations and ionization energies.
Explanation:
The shielding constant of a d electron in copper is 22.15.
From Slaters's rule;
Zeff = Z - S
Where;
Z = Nuclear charge
S = Shielding constant
Now we are required to find the shielding constant for copper d - electrons;
The shielding contributed by the d electrons = (9 × 0.35) = 3.15
The shielding contributed by other electrons = (19 × 1.00) = 19
Total shielding constant = 3.15 + 19 = 22.15
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Which of the following is considered a compound?
Ag, silver
H2, hydrogen gas
CO2, carbon dioxide gas