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How many ammonia molecules are there in 0.50 ammonia moles? Overall, are these nitrogen and hydrogen atoms present?
Write balanced molecular equations for the following reactions in aqueous solution:
a) calcium + water à calcium hydroxide + hydrogen
b) barium chloride + sodium barium à sulfate sulfate + sodium chloride
In a Daniell stack the following redox reaction occurs:
Zn(s) + Cu2+(aq) à Zn2+(aq) + Cu(s)
a) write the oxidation and reduction semi-reactions , also indicating the electrons at stake and the oxidation numbers of the reactants and products.
b) what reaction would take place in an electrolytic cell?
Determine the moles of solute particles dissolved in 1.0 Kg of water, for the following solutions:
a) CH3CH2OH, 2.0 m; b) KCl, 2.5 m; c) Al2(SO4)3, 1.0 m; d) C12H22O11 (saccarosio), 3.0 m; e) HNO3, 2.0 m
Is element 115 likely to be a metal or a nonmetal?
a. The diagram below shows an electrochemical cell:
i. Write schematic representation of the cell
You have a string like a wire that consumes in precisely one moment. The wire is inhomogeneous and it might consume gradually from the start, then, at that point, rapidly, gradually, etc. you need to coordinate and not watch. How would you gauge precisely 30 seconds?
An electrochemical cell consists of iron electrode dipped in 0. 1M FeSO4 and silver electrode
dipped in 0.05M AgNO3. Write the cell representation, cell reactions and calculate emf of the cell
at 298K.Given that the standard reduction potentials of iron and silver electrodes are – 0.44V
and + 0.80 V respectively.
Explain the meta directing nature of NO2 group?
(ii) A metal M forms two chlorides P and Q. On analysis, 2.00g of P was found to contain 0.69 g of M and 10.00 g of Q was found to contain 4.41 g of M.
