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Chemistry 1100a Test #1, October 2010 Page 1
1. Choose the statement that best describes the relationship between these three
species:
28
Si,
29
Si, and
30
Si.
A) They are isotopes of the same element.
B) They represent an isoelectronic series.
C) They are ions with different charges.
D) They differ in the number of electrons.
E) They differ in the number of protons.
2. A 250 mL aqueous solution contains 1.75 g of (NH
4
)
2
SO
4
. What is correct about
this solution?
A) The concentration of SO
42
is 5.30 × 10
2
M.
B) The solution contains 1.32 × 10
2
moles of NH
4+
.
C) The concentration of NH
4+
is 5.30 × 10
2
M.
D) The concentration of NH
4+
is 2.65 × 10
2
M.
E) The solution contains 2.65 × 10
2
moles of SO
42
.
3. Which one of the following compounds is the least soluble in water?
A) BaSO
4
B) Mg(NO
3
)
2
C) NaNO
3
D) K
2
SO
4
E) AgNO
3
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Chemistry 1100a Test #1, October 2010 Page 2
4. When 20.0 g of metal M are burned in excess oxygen, 37.8 g of M
2
O
3
are
formed. What is the atomic mass of metal M?
A) 27.0
B) 53.9
C) 18.0
D) 15.1
E) 36.0
5. 125 g of NH
3
is mixed with 256 g of O
2
and allowed to react according to the
reaction shown below. Which one of statements A – E is correct after the
reaction has completed?
4NH
3
+ 5O
2
4NO + 6H
2
O
A) The maximum amount of NO that can be produced is 192 g.
B) The maximum amount of H
2
O that can be produced is 180 g.
C) There are 34 g of O
2
remaining.
D) There are 16 g of O
2
remaining.
E) There is no NH
3
or O
2
remaining.
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Document Summary

Messag which id answers significa will be s severe a studied, please r e from the dentifies ano s by pairs o ant results w ubject to fu academic p and you th raise your h. Dean: all a omalies of s f students. which sugge urther inves penalties. If hink you ma hand now a answer shee statistical s. All su ating will be omeone wit swers as tha a analysis ng ht and wron all statistica ally ch incident s e subject to ou th whom yo at person, Scrap pa t contains 2 questions, aper and a. If you do dismisse y permitted ur possess ed, but the s calculator ion, even fo sharing of m is a sharp or timekeep models or m. , translate, our answers ed to the co clarify, or e s or your th ontent of the explain que inking.

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