Ap Chemistry Worksheet - Dr. Kathleen Gorski, Wilbraham And Monson Acaddemy Page 4
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242.29 (a) What isotope is used as the standard in establishing the atomic mass scale? (b) The atomic
weight of boron is reported as 10.81, yet no atom of boron has the mass of 10.81 amu. Explain.
2.50 Fill in the gaps in the following table:
31
3-
Symbol
P
Protons
34 50
Neutrons
45 69 118
Electrons
46 76
Net Charge
2-
3+
2.58 Complete the table by filling in the formula for the ionic compound formed by each pair of
cations and anions, as shown for the first pair.
+
2+
2+
3+
Ion
Na
Ca
Fe
Al
2-
O
Na
O
2
-
NO
3
2-
SO
4
3-
AsO
4
2.65 Name the following ionic compounds: (a) Li
O, (b) FeCl
, (c) NaClO, (d) CaSO
, (e)
2
3
3
Cu(OH)
, (f) Fe(NO
)
(g) Ca(CH
COO)
, (h) Cr
(CO
)
, (i) K
CrO
, (j) (NH
)
SO
.
2
3
2
3
2
2
3
3
2
4
4
2
4
2.70 Provide the name or chemical formula, as appropriate, for each of the following acids: (a)
hydroiodic acid, (b) chloric acid, (c) nitrous acid, (d) H2CO3 , (e) HClO4 , (f) CH3 COOH
2.99 Fill in the blanks in the following table:
Cation Anion Formula
Name
Lithium oxide
2+
3-
Fe
PO
4
Al
(SO
)
2
4
3
Copper(II) nitrate
3+
-
Cr
I
MnClO
2
Ammonium carbonate
Zinc perchlorate
3.2 Under appropriate experimental conditions, H
and CO undergo a combination reaction to
2
form CH
OH. The following drawing represents a sample of H
. Make a corresponding
3
2
drawing of the CO needed to react completely with the H
. How did you arrive at the number
2
of CO molecules in your drawing? [Section 3.2]
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