<span>I didn't know Selenium was considered organic? :P atoms form ions that mimic the electronic structure of noble gases. so add or subtract electrons from the atom to achieve the configuration of a noble gas.</span>
Answer:
i dont know but this may help :-) best of luck
Explanation:
f 1 g of water (at 0 degrees Celsius) gives away 80 calories, it will freeze and its final temperature will be 0. Boiling water at 100 degrees Celsius: 540 calories would be needed as to turn 1 gram (at 100 degrees Celsius) of water to steam.
This can be calculated using the equation q = mcΔT where m is the mass of iron, c is its specific heat capacity and Δ<span>T is the change in temperature.
Assuming c does not change with temperature and has a value of:
c = 0.444 J/K mol, the q can be calculated as:
q = 20.0 g * 0.444 J/K mol * 25 K = 222 J
(Note: K refers to Kelvin which equals ˚C + 273, therefore </span>Δ<span>T is the same in K as it is in ˚C.)</span>
Answer:
The electrochemical reaction of the battery must be reversible.
Explanation:
An electrochemical cell is device in which chemical reactions produce electricity. There are two main types of electrochemical cells:
Primary cells: In primary cells, the chemical reaction through which electric current is generated is irreversible and hence cannot be re-charged.
Secondary cells: are those in which chemical reactions through which electricity is generated is reversible. Hence they can be re-charged.