Page 56 - Chemistry eBook

(1) 4−
(3) 3+
a . o
as parts per
n
31 What is the total number of valence electrons in a germanium atom in the ground state?
(1) 22 (2) 2
36
37
Which qua
(1) 0.05 J (2) 500 J
Which com by an exo 101.3 kPa?
(1) C2H4(g (2) HI(g)
At which t ethanol eq
(1) 48°C (2) 73°C
At 25°C, ga piston has a 125 kPa. volume of the gas if th
(1) 69 kPa (2) 93 kPa
A 2400.-gr contains 0 concentrati
(3) 32 (4) 4
Sample Regents Questions
32 Which element is paired with an excited-state electron configuration for an atom of the element?
(1) Ca: 2-8-8-2 (3) K: 2-6-8-3 (2) Na: 2-8-2 (4) F: 2-8
33 Given the balanced equations representing two chemical reactions: Jan 2012 #32
38
Cl2 + 2NaBr → 2NaCl + Br2 Answer
2NaCl → 2Na + Cl2
ChoicWe #hi3ch types of chemical reactions are represented
39
Explanation:
1. W(e1’r)e lsoionkginlgefroer panlaecxceimtedesntattea.nSdo dleet’csocmrospsosffitcihoonices 2 and 4 because
th(e2y)arseiningglreournedpsltacte(m2-e8n-1t8a-n32d).double replacement
2. Ca(3is) aslsyonitnhgersouisndasntdated. eItchoamd tpoomsaikteiotnhe last two electrons jump to the
ne(x4t)lesvyelnbtehceaussiesyaonudcadn’otuhabvelemroereptlhaacne8meelenctronsonthelastshell.
3. K is in excited state because it jumped to level three before filling up layer
by these equations?
two.
40
34 An ion that consists of 7 protons, 6 neutrons, and 10 electrons has a net charge of
)
e u
T 8
56 © UNIT 2: ATOMIC STRUCTURE