Arrange these elements in order of increasing atomic radius: Ca, Rb, S, Si, Ge,

Question

Arrange these elements in order of increasing atomic radius: Ca, Rb, S, Si, Ge, F Which are the larger species in the two pain: Li and Li^+; O and O^2+? HClO_4 is a , Ba(OH)_2 is a , and NaNO_3 is a ,The blanks in the sentence above should Sc filled in with which of the respective classifications? What is the oxidation number of P in PO_3^3? How many moles of nitrogen are formed when 101 g of KNO_3 decomposes according to the following reaction? The molar mass of KNO_3 is 101 g/mol. 4 KNO_3(s) rightarrow 2K_2O(s) + 2N_2(g) + 5 O_2(g) Which of the following is a nonpolar molecule with polar bonds? Which one of the following ionic compounds would have the highest lattiee energy?

Explanation / Answer

18) b)Li+ and O

19) e) strong acid, weak base, salt

20) d)+3

21) 4KNO3 (s) ------ 2K2O + 2N2 + 5O2

With the molecular weith we change the amount of KNO3 that we add to mol.

101g -------weigths----- 1mol of KNO3

101g ---------------------- X=1mol

So we added 1mol of KNO3.

We use the equation to stablish the relationship between the reactant and product that we want in this case N2.

4mol of KNO3 ------produces------ 2 mol of N2

1mol KNO3 --------------------------- X= 0,5mol of N2.

So we will produce 0,5 mol of N2 that means the answer is b) 1/2mol N2

22) d) CO2

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