An unknown element, x, reacts with lithium to form the compound li2x. in other compounds this element also can accommodate up to
2 answers:
Answer:
X could be S, Se, Te, Po or Lv.
Explanation:
From the formula , it can be determined the charge of the ion X:
Li is a metal from the group 1 (alkaline metal) in the periodic table,so the only charge possible for it is +1. As the formula contains two Li, the total positive charge gives +2. This impplies that X must holds a charge of -2.
Inspection of the periodic table shows that atoms that commonly gain two electrons forming -2 charged anions are the ones in group 16.
The second part of the text states that X can accommodate 12 electrons expanding its octect. This effect can be observed in atoms that have empty d-orbitals available to accomodate those extra electrons. Thus, atoms from period 3 and above show octect expansion.
The elements that are in group 16 in period 3 or above are S, Se, Te, Po and Lv.
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This is an incomplete question, here is a complete question.
For the net reaction: 2AB + 2C → A2 + 2BC, the following slow first steps have been proposed.
(1) AB → A + B
(2) 2C + AB → AC + BC
(3) 2AB → A₂ + 2B
(4) C + AB → BC + A
What rate law is predicted by each of these steps?
Answer : The rate law expression for the following reactions are:
(1)
(2)
(3)
(4)
Explanation :
Rate law : It is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.
The general reaction is:
The general rate law expression for the reaction is:
where,
a = order with respect to A
b = order with respect to B
R = rate law
k = rate constant
and
= concentration of A and B reactant
Now we have to determine the rate law for the given reaction.
(1) The balanced equations will be:
In this reaction, is the reactant.
The rate law expression for the reaction is:
(2) The balanced equations will be:
In this reaction, and
are the reactants.
The rate law expression for the reaction is:
(3) The balanced equations will be:
In this reaction, is the reactant.
The rate law expression for the reaction is:
(4) The balanced equations will be:
In this reaction, and
are the reactants.
The rate law expression for the reaction is: