CHEM 121 FINAL EXAM | Updated Questions and
Answers Updated (2025/ 2026) -A+ GRADED , 100%
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Chapter 1 Exam - ANSWER
What is a property of both gases and liquids? - ANSWER Indefinite Shape
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 - ANSWER Decomposes and reacts
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 - ANSWER It is converted to a new kind of matter
with a different composition
The description "two substances present, two phases present" is correct for what type of
mixture? - ANSWER Heterogeneous mixture
An element is a substance that... - ANSWER Cannot be broken down by chemical or physical
means
, 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: -
ANSWER They are all compounds
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 - ANSWER C
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. - ANSWER C
Which of these is incorrect?
A) LiCN and triatomic
B) N2 and homoatomic
C) KCl and heteroatomic
D) SiO2 and diatomic - ANSWER D
In which of the following pairs of chemical formulas do both formulas represent compounds?
A) O2 and O3
B) HCN and N2
Answers Updated (2025/ 2026) -A+ GRADED , 100%
VERFIED, SUCCESS GUARANTEED
Chapter 1 Exam - ANSWER
What is a property of both gases and liquids? - ANSWER Indefinite Shape
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 - ANSWER Decomposes and reacts
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 - ANSWER It is converted to a new kind of matter
with a different composition
The description "two substances present, two phases present" is correct for what type of
mixture? - ANSWER Heterogeneous mixture
An element is a substance that... - ANSWER Cannot be broken down by chemical or physical
means
, 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: -
ANSWER They are all compounds
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 - ANSWER C
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. - ANSWER C
Which of these is incorrect?
A) LiCN and triatomic
B) N2 and homoatomic
C) KCl and heteroatomic
D) SiO2 and diatomic - ANSWER D
In which of the following pairs of chemical formulas do both formulas represent compounds?
A) O2 and O3
B) HCN and N2
