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CHM 1025: On-Line Practice Final Form B

Module Five

Module 5 Test Masters:

Brett Spann [Test Input]

John Taylor (jtaylor@masterlinx.net) [Template Author]

Multiple Choice [One Answer Only]

Question 1

The atomic mass of beryllium is 9.01 amu. How many atoms of beryllium have a mass equal to 9.01 g?

a)1
b)4
c)9
d)6.02 * 10²³
e)none of the above

Question 2

Which of the following contains Avogadros number of entities?

a)one mole of neon atoms
b)one mole of ammonia molecules
c)potassium chloride formula units
d)chromate ions
e)all of the above

Question 3

What is the molar mass of aluminum chlorate, Al(CLO₃)₃?

a)110.5 g/mol
b)206.5 g/mol
c)250.5 g/mol
d)277.5 g/mol
e)331.5 g/mol

Question 4

The formula for the illegal drug cocaine is C₁₇H₂₁NO₄. What is the percentage of nitrogen in the compound?

a)4.62%
b)6.93%
c)18.5%
d)21.1%
e)83.2%

Question 5

Fructose is a sugar found in fruit and honey. Calculate the emperical formula for fructose given its percentage composition: 40.00% C, 6.72% H, and 53.29% O.

a)C₁H₁O₁
b)C₁H₂O₁
c)C₁H₁O₂
d)C₃H₆O₃
e)C₆H₁O₈

Question 6

Lysine is used as a topical cream for skin disorders. WHat is the molecular formula of lysine if the emperical formula is C₃H₇NO and the approximate molar mass is 146 g/mol?

a)C₁H₁NO
b)C₃H₇NO
c)C₃H₇NO₂
d)C₆H₁₄NO₂
e)C₆H₁₄N₂O₂

Question 7

Which of the following gases does not occupy 22.4 L at STP?

a)one mole of chlorine, CL₂
b)One mole of hydrogen, H₂
c)one mole of nitrogen, N₂
d)one mole xenon, Xe
e)none of the above

Question 8

Which of the following is evidence for reaction when two solutions are mixed?

a)bubbles are released
b)insoluble particles form
c)an indicator changes color
d)heat is produced
e)all of the above

Question 9

What is the coefficient of hydrogen after balancing the following equation?

__N₂(g) + __H₂(g) ---> __NH₃(g)

a)1
b)2
c)3
d)4
e)none of the above

Question 10

Which of the following types of chemical reactions is illustrated below?

__Sr(s) + __H₂O(l) ---> __Sr(OH)₂(aq)

a)combination
b)decomposition
c)single replacement
d)double replacement
e)neutralization

Question 11

Which of the following metals reacts with aqueous Al (NO₃)₃?

a)Mg
b)Zn
c)Cu
d)all of the above
e)none of the above

Question 12

What are the products from the following double replacement reaction?

BaCl₂(aq) + K₂SO₄(aq)--->

a)BaS and KClO₄
b)BaSO₃and KCl
c)BaSO₃and KClO₄
d)BaSO₄and KCl
e)BaSO₄and KCLO₄

Question 13

What is the term for the type of reaction in which two or more substances are produced from a single compound?

a)combination
b)decomposition
c)double replacement
d)neutralization
e)single replacement

Question 14

How many moles of hydrogen iodide gas are produced from the reaction of 0.500 mol of hydrogen gas according to following reaction?

__H₂(g) + __I₂(g) ---> __HI(g) @ 425^oC

a)0.250 mol
b)0.500 mol
c)1.00 mol
d)2.00 mol
e)none of the above

Question 15

Calculate the mass of insoluble calcium phosphate (310.3 g/mol) produced from the reaction of 0.555 g of calcium chloride (111.1 g/mol).

__CaCl₂(s) + __Na₃PO₄(aq) ---> __Ca₃(PO₄)₂(s) + __NaCl(aq)

a)0.0662 g
b)0.517 g
c)0.596 g
d)1.55 g
e)4.65 g

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