Chem 141 Final Exam 2025 Questions
and Answers
The plum pudding model of the atom was in improvement over _____ model of
the atom because _____
1. Dalton's
2. Thomson's
3. Rutherford's
4. The cathode ray tube provided evidence for the existence of particles smaller
than an atom
5. The gold foil expirment provided evidence for a small, massive nucleus in the
middle of the atom
6. Isotopes are atoms of the same element with a different number of neutrons in
the nucleus
a. 3 and 4
b. 1,2 and 5
c. 2 and 5
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,d. 1 and 6
e. 1 and 5
f. 1 and 4 - --CORRECT ANSWER--f. 1 and 4
The greek's ideas about atoms were based more on philosophy than evidence.
Which of their ideas is still considered to be true and what is the evidence that now
supports it?
1. The shapes of atoms determine their properties
2. Atoms are composed of mostly empty space
3. Atoms are the smallest piece of matter
BECAUSE
4. When alpha particles are shot at a piece of golf foil, most go straight through
5. Advanced microscopy techniques allow us to visualize atoms, but nothing
smaller
6. Snowflakes are hexagonal because atoms of water are hexagonal
a. 1 and 5
b. 2 and 5
c. 1 and 6
d. 3 and 4
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, e. 2 and 4
f. 3 and 5 - --CORRECT ANSWER--e. 2 and 4
What evidence was used to disprove this statement from Dalton's Atomic Theory?
All atoms of an element are identical and have the same mass and properties
a. Electrons have a negative charge and were attracted to the plate with the positive
charge
b. the existence of ions
c. protons are located in the nucleus of the atom
d. the existence of isotopes
e. The existence of electrons from the cathode ray tube experiment - --CORRECT
ANSWER--d. the existence of isotopes
Was Dalton's atomic theory a scientific theory?
1. Yes
2. No
BECAUSE
3. It is based on available experimental evidence and scientific theory that can
change when new evidence becomes available
4. It is not completely correct, and a scientific theory cannot be proven false.
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and Answers
The plum pudding model of the atom was in improvement over _____ model of
the atom because _____
1. Dalton's
2. Thomson's
3. Rutherford's
4. The cathode ray tube provided evidence for the existence of particles smaller
than an atom
5. The gold foil expirment provided evidence for a small, massive nucleus in the
middle of the atom
6. Isotopes are atoms of the same element with a different number of neutrons in
the nucleus
a. 3 and 4
b. 1,2 and 5
c. 2 and 5
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,d. 1 and 6
e. 1 and 5
f. 1 and 4 - --CORRECT ANSWER--f. 1 and 4
The greek's ideas about atoms were based more on philosophy than evidence.
Which of their ideas is still considered to be true and what is the evidence that now
supports it?
1. The shapes of atoms determine their properties
2. Atoms are composed of mostly empty space
3. Atoms are the smallest piece of matter
BECAUSE
4. When alpha particles are shot at a piece of golf foil, most go straight through
5. Advanced microscopy techniques allow us to visualize atoms, but nothing
smaller
6. Snowflakes are hexagonal because atoms of water are hexagonal
a. 1 and 5
b. 2 and 5
c. 1 and 6
d. 3 and 4
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, e. 2 and 4
f. 3 and 5 - --CORRECT ANSWER--e. 2 and 4
What evidence was used to disprove this statement from Dalton's Atomic Theory?
All atoms of an element are identical and have the same mass and properties
a. Electrons have a negative charge and were attracted to the plate with the positive
charge
b. the existence of ions
c. protons are located in the nucleus of the atom
d. the existence of isotopes
e. The existence of electrons from the cathode ray tube experiment - --CORRECT
ANSWER--d. the existence of isotopes
Was Dalton's atomic theory a scientific theory?
1. Yes
2. No
BECAUSE
3. It is based on available experimental evidence and scientific theory that can
change when new evidence becomes available
4. It is not completely correct, and a scientific theory cannot be proven false.
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
