I need help with a chemistry assignment

Nov 17th, 2015
RockCafe
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Biology
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Question description

1which of the following happens when rubidum forms a ion

it gains an electron and has an octet in the lowest energy level

it loses an electron and has an octet in the next lowest energy level

it gains an electron and has an octet in its outer shell

it loses an electron and has an octet in its innermost shell

2 which of the following ions is an oxyanion

SO4^2-

F-

SCN-

NH4+

3 in the mineral beryl {BeAl2(Sl03)6} what is the ratio of beryllium to aluminum to silicon(SlO3)

1:2:3

1:1:1

1:2:6

1:3:6

4 the bond strength of compounds A,B.C and D as measured by their bond engergies (kl/mol) 350,500,180, and 1,450, respectively  which compound will most likely conduct electricity when dissolved in water hint the compound has a high bond energy then it will be an ionic compound

compound C 

compound A

compound D

compound B

5 which of the following ions would represent the ion of an element from group 2A

Z+

T3+

X2-

E2+

6 which of the following is a property of an ionic compound

low boiling point

brittle

blue

low melting point

7 which of the following ions will most likely form  a precipitate when reacted with SO4^2-

Ba 2+

l-

Na+

K+

8 which of the following compoundscontains a triple bond

methane

acetylene

chlorine

ammonia

9 in an electron dot diagram of ethylene how many double bonds are present

three

none

two

one

10 what is a molecular shape of silicon tetrabromide

pyrimidal

bent triatomic

linear

tetrahedron



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