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Chapter 01 Atomic Theories 01


Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
A tentative explanation used to explain observed facts or laws is called
a.
the scientific method.
b.
a scientific law.
c.
a theory.
d.
a hypothesis.
e.
an empirical fact.
 

 2. 
A broad generalization based on the results of many experiments is called
a.
the scientific method.
b.
a scientific law.
c.
a theory.
d.
a hypothesis.
e.
an empirical fact.
 

 3. 
An example of an element is
a.
glucose, C6H12O6.
b.
table salt, NaCl.
c.
gold, Au.
d.
an oxide of iron, Fe2O3.
e.
limestone, CaCO3.
 

 4. 
An example of a chemical compound is
a.
iron metal, Fe.
b.
brass, a solution of Cu and Zn.
c.
ozone gas, O3.
d.
sand.
e.
table salt, NaCl.
 

 5. 
The two types of pure substances are
a.
compounds and elements.
b.
compounds and solutions.
c.
elements and mixtures.
d.
mixtures and solutions.
e.
solutions and elements.
 

 6. 
Which is an example of a chemical change?
a.
Steam from the boiling water condenses on the ceiling.
b.
The solid metal is heated until it melts.
c.
The gas is cooled until it finally becomes a liquid.
d.
A piece of paper burns in air with a smoky flame.
e.
The table salt in the warehouse container had very large chunks in it.
 

 7. 
Which is an example of a physical change?
a.
The milk in the box left on the table becomes sour after a few days.
b.
The bit of scrap metal dissolves when placed in the container of acid.
c.
The gas is cooled until it finally becomes a liquid.
d.
A piece of paper burns in air with a smoky flame.
e.
Bubbles are seen on the egg shell after some vinegar is poured on it.
 

 8. 
Which is an example of both a physical and a chemical change?
a.
The milk in the carton became frozen after the carton was accidentally placed in the freezing compartment overnight.
b.
The bit of scrap metal was removed to the junkyard after being crushed by the heavy machine.
c.
The gas was collected in a flask and cooled until it eventually became a liquid.
d.
The old parchment became dry after being placed in the hot oven, but then was charred since it was not removed in the specified time.
e.
Bubbles were seen on the egg shell when the vinegar was poured on it.
 

 9. 
The relative number of atoms of each element in a particular compound
a.
is always l:l.
b.
is the same as the density ratio.
c.
is the same as the weight ratio.
d.
is definite and constant.
e.
cannot be determined experimentally.
 

 10. 
Which of the following postulates from Dalton’s atomic theory are now considered incorrect?
I. All the atoms of a given element are identical .
II. Matter consists of very small particles known as atoms.
III. Atoms are indestructible and indivisible.
a.
III only.
b.
II only.
c.
I only.
d.
I and II
e.
I and III
 

 11. 
Which of the following postulates from Dalton’s atomic theory is incorrectly stated?
a.
The atoms in a given sample of an element are identical.
b.
Matter consists of tiny particles called atoms.
c.
In chemical reactions, atoms merely rearrange, but do not disintegrate.
d.
In a given chemical compound, the atoms can be present in various numerical ratios.
e.
In a given chemical compound, the atoms are always present in the same fixed numerical ratio.
 

 12. 
Which of the following is used to represent elemental bromine?
a.
Be
b.
B
c.
2Br
d.
Br2
e.
Br
 

 13. 
Which element exists as a diatomic molecule in the free state?
a.
C
b.
N
c.
Ga
d.
Ge
e.
P
 

 14. 
Which compound is correctly represented as a hydrate?
a.
C2H5OH2+
b.
MgSO4·7H2O
c.
FeH2(CO)4
d.
O2S(OH)2
e.
[CrCl(H2O)5]Cl
 

 15. 
The number of atoms in one formula unit of the substance, CO(NH2)2, is
a.
4
b.
5
c.
6
d.
7
e.
8
 

 16. 
How many atoms are there in one formula unit of (NH4)4Fe(CN)6?
a.
15
b.
25
c.
28
d.
33
e.
35
 

 17. 
How many hydrogen atoms appear on the right side of the equation, 4NH3 + 3O2 ® 2N2 +   6H2O?
a.
2
b.
4
c.
6
d.
10
e.
12
 

 18. 
How many atoms of each element appear on each side of the arrow in the following
        chemical equation?  2Fe(NO3)3 + 3Na2CO3 ®   Fe2(CO3)3 + 6NaNO3
a.
2Fe, 6N, 18O, 6Na, 3C
b.
2Fe, 6N, 27O, 6Na, 9C
c.
2Fe, 6N, 27O, 6Na, 3C
d.
2Fe, 6N, 27O, 9Na, 3C
e.
2Fe, 6N, 21O, 18Na, 3C
 



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