CHEM 141 final exam 2025 Questions
and Answers
Consider the question: Is there an attractive force between a pencil and the
earth?Is this a scientific question?
I.) Yes or II.) No
Because
III. It can be tested and answered through observations and experiments.
IV. The answer is already known and we find it online.
V. There is no way to design an experiment to answer this question - --CORRECT
ANSWER--a. I and III
Which of the following properties ascribed to atoms by the Greeks do we still
considervalid?
I. The size and the shape of the atoms determine a material's properties
.II. Atoms are indivisible.
III. Atoms are in constant motion - --CORRECT ANSWER--e. III only
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,Electrons are negatively charged. Which experiment provided evidence to support
thisclaim? What is the specific evidence used to support this claim?Experiment:
I. The gold foil experiment.
II. The cathode ray tube experiment.Evidence:III. Most of the positively charged
alpha particles shot at a thin gold foil passedstraight through.
IV. A small fraction of the positively charged alpha particles shot at a thin gold
foilwere deflected.
V. The beam of particles emitted from the cathode bent toward the
positivelycharged plate
.VI. The beam of particles emitted from the cathode behaved the same no matter
whattype of metal the cathode was made of - --CORRECT ANSWER--c. II and V
Which of the following contain(s) atoms?
a. heat b. light c. d. dust energy e. all of the above - --CORRECT ANSWER--d.)
dust
Thomson's cathode ray tube experiment proved false what part of Dalton's
atomictheory?
a. All atoms are indivisible and indestructible.
b. All atoms of a given element are identical
.c. All matter is made of atoms.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, d. Compounds are formed from the combination of two or more elements.
e. Chemical reactions are rearrangements of atoms - --CORRECT ANSWER--a.)
All atoms are indivisible and indestructible.
How would the strength of the electrostatic force change if the distance between
twocharged objects decreased?
a. The electrostatic force would become stronger.
b. The electrostatic force would become weaker.
c. The electrostatic force would become stronger or weaker depending on whether
theforce is attractive or repulsive.
d. It is impossible to say from the information given - --CORRECT ANSWER--a.
The electrostatic force would become stronger.
Consider the following statement: "A nitrogen molecule is made of the same type
ofatoms." Is this statement true or false and why?
I. True
II. False
Because:
III. An element is made of one type of atom. Nitrogen is an element that exists
asdiatomic molecules.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
and Answers
Consider the question: Is there an attractive force between a pencil and the
earth?Is this a scientific question?
I.) Yes or II.) No
Because
III. It can be tested and answered through observations and experiments.
IV. The answer is already known and we find it online.
V. There is no way to design an experiment to answer this question - --CORRECT
ANSWER--a. I and III
Which of the following properties ascribed to atoms by the Greeks do we still
considervalid?
I. The size and the shape of the atoms determine a material's properties
.II. Atoms are indivisible.
III. Atoms are in constant motion - --CORRECT ANSWER--e. III only
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,Electrons are negatively charged. Which experiment provided evidence to support
thisclaim? What is the specific evidence used to support this claim?Experiment:
I. The gold foil experiment.
II. The cathode ray tube experiment.Evidence:III. Most of the positively charged
alpha particles shot at a thin gold foil passedstraight through.
IV. A small fraction of the positively charged alpha particles shot at a thin gold
foilwere deflected.
V. The beam of particles emitted from the cathode bent toward the
positivelycharged plate
.VI. The beam of particles emitted from the cathode behaved the same no matter
whattype of metal the cathode was made of - --CORRECT ANSWER--c. II and V
Which of the following contain(s) atoms?
a. heat b. light c. d. dust energy e. all of the above - --CORRECT ANSWER--d.)
dust
Thomson's cathode ray tube experiment proved false what part of Dalton's
atomictheory?
a. All atoms are indivisible and indestructible.
b. All atoms of a given element are identical
.c. All matter is made of atoms.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, d. Compounds are formed from the combination of two or more elements.
e. Chemical reactions are rearrangements of atoms - --CORRECT ANSWER--a.)
All atoms are indivisible and indestructible.
How would the strength of the electrostatic force change if the distance between
twocharged objects decreased?
a. The electrostatic force would become stronger.
b. The electrostatic force would become weaker.
c. The electrostatic force would become stronger or weaker depending on whether
theforce is attractive or repulsive.
d. It is impossible to say from the information given - --CORRECT ANSWER--a.
The electrostatic force would become stronger.
Consider the following statement: "A nitrogen molecule is made of the same type
ofatoms." Is this statement true or false and why?
I. True
II. False
Because:
III. An element is made of one type of atom. Nitrogen is an element that exists
asdiatomic molecules.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
