chem question?

Question

which of the following statements are true?


a) For an acid H-A : the greater the electronegativity of A, the stronger the acid HA

b) For an acid H-A : the stronger the H-A bond, the stronger the acid H-A

c) HBr is a stronger acid than HF

d) H2SO3 is a weaker acid than H2SO4

e) HIO is a stronger acid than HBrO

f) For carboxylic acids : the greater the electronegativities of the atoms in the group bonded to the carboxyl group, the stronger the acid

Answer 1

a) True. The more electronegative the A, the more it will pull the bond electrons closer to it and the easier it will dissociate.

b) False. The stronger the bond the more difficult it is to break, thus the weaker the acid.

c) True. Although Br is less electronegative, it is bigger in size, so the negative charge of the Br- ion is better stabilized making it a weaker base than F- and thus the conjugate acid HBr stronger. You should be careful because for binary acids of elements of the same group the size factor wins over the electronegativity factor.

d)True. You have more O atoms in H2SO4 which stabilize the negative charge in the conjugate base better because of the electronegativity of O but also because you have more resonance structures.

e)False. Now the acids are not binary, so the electronegativity factor wins: Br is more electronegative thus the BrO group is better at pulling the electrons than the IO group and therefore HBrO is stronger

f) True.

Answer 2

a million.0 Potassium is extremely electropositive element with low ionization potential. This belongings makes the outer valance electrons ejection relatively undemanding with electric powered voltage. As you be attentive to electric powered impulses are using circulate of electrons 2.0 4 moles of Al reacts with 3 moles O2 giving Aluminum oxide. this implies that 8 moles of Al choose six moles of O2 3.0 group III era iv, probably the element is Ga and the Oxide is Ga2O3 4.0 1s2 2s2 2p6 3s13Px1