Which one of the following compounds would produce an acidic solution when disso

Question

Which one of the following compounds would produce an acidic solution when dissolved l Na_2O CaO MgO CO_2 Sr O Which one of the following is a metal? greaterthanorequalto S Br Pb C Based on the octet rule, magnesium most likely forms a ion. Mg^2+ Mg^2- Mg^6- Mg^6+ Mg^- The halogens, alkali metals, and alkaline earth metals have valence electrons respectively. 7, 4 and 6 1, 5, and 7 8, 2, and 3 7, 1, and 2 2, 7, and 4 For a given arrangement of ions, the lattice energy decreases as ionic radius and as ionic charge decreases, increases increases, decreases increases, increases decreases, decreases This cannot be predicted. The formal charge on carbon in the molecule below is 0 +1 +2 +3 -1 Of the bonds below. is the least polar. C - O N - O C - F S - O K - Br

Explanation / Answer

Q4.

acidic solution --> rich in H+ ions

so:

CO2 + H2O --> H2CO3

then

H2CO3 --> H+ + HCO3-

HCO3- --< H+ + CO3-2

this is rich in H+

Q5

metal --> must be have metal properties such as metallic bonding, hardness, malleability, etc...

Ge --> metalloid

S, Br, C --> nonmetal

Pb --> Metal this is lead

Q6

For octect:

Mg is in 2nd group, then it must form +2 ions

that is, Mg2+

Q7

halogens = 7

alkali metals --> 1

alkaline earth --> 2

7,1,2

Q8

If charge decrease, they will not stick together

so

if ionic radius decreases, then this will not attract

Q9

formal charge of C in CO2 --> 0 since 6-4 + 1/2*-2 bonded = 0

Q10

least polar --> will hav every low electronegativity difference

so..

O = 3.5

C = 2.5

S = 2.6

N = 3.0

F = 4.0

CO = 1; NO = 0.5 CF = 1.5 SO = 0.9

therefor

echoose NO

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