The answer is ligand: a molecule or ion that can bond to a (central) metal ion (to form a complex);
NH3: Lewis base and Cu2+: Lewis acid (need both for mark);
<span>each NH3/ligand donates an electron pair (to Cu2+); forming coordinate covalent/dative covalent bond; i hope this help you.</span>
Answer:
Explanation:
Hello.
In this case, given the described reaction, the formation of nitric acid turns out:
Since two hydrogen atoms are present at the reactants we balance it as follows:
In such a way, since there is a 1:2 mole ratio between water and nitric acid, the produced moles of nitric acid, turns out:
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Answer:
The activity of 50mg of Sr is 
Explanation:
Every nuclear disintegration follows the first order rate, thus the half-life (t1/2) is 
where k is the constant of the reaction.
<em>Considering 1 year equals 3.15x107 seconds</em>
For Sr with t1/2 = 
, the constant of the reaction is
The activity (A) of a nucleus is 
where N is the number of nucleus. Sr molecular mass is 87.6g/mol and every mol contains 6.023x1023 atoms, thus
Therefore, the activity of 50mg of Sr is
1:The energy involved in a phase change depends on two major factors: the number and strength of bonds or force pairs. The number of bonds is proportional to the number of molecules and thus to the mass of the sample. The strength of forces depends on the type of molecules. The heat Q required to change the phase of a sample of mass m is given by
2:According to the law of conservation of energy, energy can neither be created nor destroyed but can be transformed from one form to another. Conversion of electric energy into sound energy is an example of the conservation of energy.
Explanation:
Hope it helps UvU
4HBr(aq) + O2(g)= 2H2O(l) + 2Br2(l)
