A 1.3 g sample of gold (specific heat capacity = 0.130 J/g °C) is heated using 86.9 J of energy. If the original temperature of the gold is 25.0°C, what is its final temperature?

556.95°C

Explanation:

The following were obtained from the question:

M = 1.3g

C = 0.130 J/g °C

Q = 86.9J

T1 = 25.0°C

T2 =?

Q = MC(T2 — T1)

86.9 = 1.3 x 0.13(T2 — 25)

Clear the bracket

86.9 = 0.169T2 — 4.225

Collect like terms

89.9 + 4.225 = 0.169T2

94.125 = 0.169T2

Divide both side by 0.169

T2 = 94.125/0.169

T2 = 556.95°C

"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."

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.