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Chemistry, Inorganic Chemistry
High School
A simple Entroy question:
A) Define entropy. Why is entroy considered an absolute quantity?
B) For each of the pairs of substances below, choose the one expected to have the greater absolute entropy. Explain your answer. Assume 1 mol of each substance.
i) Cu(s) or C(graphite) at the same temperature and pressure
ii) Ne(g) at 5.0atm or Ne(g) at 0.10atm, both at the same temperature.
iii) Liquid water or liquid hexane, both at the same temperature and presure.
iv) Ca(s) at 300K or Ca(s) at 500K, both at the same pressure.
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Balancing a radioactive decay equation. - In the equation 226/88 Ra--> 4/2 He+ ------, the characteristics of the missing particle are:
A) charge, 90; nucleons, 230
B) charge, 86; nucleons, 230
C) charge, 90; nucleons, 222
D) charge, 86; nucleons, 222
What are the products of the following radioactive decays - What are the products of the following radioactive decays?
A. Alpha emission by:
162 Re
75
B. Beta emission by:
188 W
74
C. Positron emission by:
165 Ta
73
See attachment for better visual
Understanding radioactive decay calculations, nuclear chemistry and half-life. - The half-life of Iodine-126 is 60 days. If the original sample had a mass of 50.0 grams, how much is left after 360 days?
Electrochemistry problem - How many coulombs of charge are required to oxidize 1.0g of copper to copper(II) ions?
electrochemistry - I am trying to determine the separate half reactions and overall cell process for the following and need some help:
a minature battery is composed of Zn and a paste of KOH, water, mercury (II) oxide, and mercury. Zinc and potassium hydroxide are consumed, mercury is deposited, and potassium zincate is formed.
Also, what would be the notation for this cell?
Thanks for...
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