Final Exam Chem. 121
Chapter 1 Exam
What is a property of both gases and liquids?
Which of the following pairs of properties are both properties chemical properties?
-Freezes at 109 C and nonflammable
-Decomposes at 500 C and reacts with bromine
-Poor conductor of heat and is reddish brown...
3). Which of the following pairs of properties are both properties chemical properties?
-freezes at 109 c and nonflammable
-decomposes at 500 c and reacts with bromine
-poor conductor of heat and is reddish brown in color
-has a low density and is very hard
Ans: Decomposes and reacts
4). When a substance undergoes a chemical change it is always true that:
-it liquifies
-it changes from a solid to a gas
-it is converted to a new kind of matter with a different composition
-the temperature of the substance increases
Ans: It is converted to a new kind of matter with a different composition
5). The description "two substances present, two phases present" is correct for what type of
mixture?
Ans: Heterogeneous mixture
6). An element is a substance that...
Ans: Cannot be broken down by chemical or physical means
7). A pure substance f is found to change upon heating into two new pure substances m and y.
both m and y may be decomposed by chemical means. from this we can conclude that:
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, Ans: They are all compounds
8). In which of the following sequences of elements does each of the elements have a one-
letter chemical symbol?
a) indium, carbon, silver
b) antimony, boron, nitrogen
c) iodine, boron, tungsten
d) nitrogen, germanium, bromine
Ans: C
9). Which of the following statements about atoms is incorrect?
a) an atom is the smallest "particle" of an element that can exist and still have the
properties of that element.
b) free isolated atoms are rarely encountered in nature.
c) atoms may be decomposed using chemical change
d) only one kind of atom may be present in a homoatomic molecule.
Ans: C
10). Which of these is incorrect?
a) licn and triatomic
b) n2 and homoatomic
c) kcl and heteroatomic
d) sio2 and diatomic
Ans: D
11). In which of the following pairs of chemical formulas do both formulas represent
compounds?
a) o2 and o3
b) hcn and n2
c) co2 and o2
d) n2o4 and no3
Ans: D
12). Which of the following is a correct description for a sample of ice cubes in water?
a) one phase present, one substance present
b) one phase present, two substances present
c) two phases present, one substance present
d) two phases present, two substances present
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