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Subatomic Particles and Atomic Structure, Exams of Chemistry

University of Florida (UF)Chemistry

Key concepts related to subatomic particles and the structure of atoms, including the properties and composition of protons, neutrons, and electrons, as well as the arrangement of these particles within an atom. It also addresses topics such as atomic number, mass number, isotopes, and the calculation of atomic mass. A comprehensive overview of fundamental principles in atomic theory and structure, which are essential for understanding chemistry at the most basic level. By studying this material, students can gain a solid foundation in the nature of matter and the building blocks of the physical world.

Typology: Exams

2024/2025

Available from 10/19/2024

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CHM 2045 EXAM 1 QUESTIONS
WITH THE LATEST AND
UPDATED SCORE.
(1) Which of the following statements about subatomic particles is
TRUE?
A) Protons have about the same mass as electrons.
B) Neutrons and electrons are found in the nucleus of an atom.
C) Protons and neutrons have opposite, but equal in magnitude,
charges.
D) A neutral atom contains the same number of protons and electrons.
E) Electrons make up most of the mass of an atom. -- Correct Answer
โœ”โœ” D) A neutral atom contains the same number of protons and
electrons.
(2) Identify the description of an atom.
A) electrons in nucleus; protons and neutrons in orbitals
B) protons and neutrons in nucleus; electrons in orbitals
C) neutrons in nucleus; protons and electrons in orbitals
D) protons and electrons in nucleus; neutrons in orbitals
E) neutrons and electrons in nucleus; protons in orbitals -- Correct
Answer โœ”โœ” B) protons and neutrons in nucleus; electrons in orbitals
(1) The mass number is equal to...
A) the sum of the number of the neutrons and electrons.
B) the sum of the number of the electrons and protons.
C) the sum of the number of protons and neutrons.
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Download Subatomic Particles and Atomic Structure and more Exams Chemistry in PDF only on Docsity!

CHM 2045 EXAM 1 QUESTIONS

WITH THE LATEST AND

UPDATED SCORE.

(1) Which of the following statements about subatomic particles is TRUE? A) Protons have about the same mass as electrons. B) Neutrons and electrons are found in the nucleus of an atom. C) Protons and neutrons have opposite, but equal in magnitude, charges. D) A neutral atom contains the same number of protons and electrons. E) Electrons make up most of the mass of an atom. -- Correct Answer โœ”โœ” D) A neutral atom contains the same number of protons and electrons. (2) Identify the description of an atom. A) electrons in nucleus; protons and neutrons in orbitals B) protons and neutrons in nucleus; electrons in orbitals C) neutrons in nucleus; protons and electrons in orbitals D) protons and electrons in nucleus; neutrons in orbitals E) neutrons and electrons in nucleus; protons in orbitals -- Correct Answer โœ”โœ” B) protons and neutrons in nucleus; electrons in orbitals (1) The mass number is equal to... A) the sum of the number of the neutrons and electrons. B) the sum of the number of the electrons and protons. C) the sum of the number of protons and neutrons.

D) the sum of the number of protons, neutrons, and electrons. -- Correct Answer โœ”โœ” C) the sum of the number of protons and neutrons (2) An iron-56 nucleus contains A) 56 protons and 56 neutrons. B) 26 protons and 30 neutrons. C) 56 protons and 26 neutrons. D) 30 protons and 26 neutrons. E) 26 protons and 26 neutrons. -- Correct Answer โœ”โœ” B) 26 protons and 30 neutrons Determine the number of protons, neutrons and electrons in the following: 18X 40 A) p+ = 18 nยฐ = 22 e- = 40 B) p+ = 22 nยฐ = 18 e- = 18 C) p+ = 40 nยฐ = 22 e- = 18 D) p+ = 18 nยฐ = 22 e- = 18 E) p+ = 18 nยฐ = 18 e- = 22 -- Correct Answer โœ”โœ” D) p+ = 18 nยฐ = 22 e- = 18 What does "X" represent in the following symbol? 35X 80 -- Correct Answer โœ”โœ” A) bromine (5) The atomic number indicates __________. A) the total number of neutrons and protons in a nucleus B) the number of neutrons in a nucleus C) the number of protons or electrons in a neutral atom D) the number of atoms in 1 g of an element

What species is represented by the following information? p+ = 47 nยฐ = 62 e- = 46 A) Ag+ B) Pd+ C) Ag D) Nd E) Pd -- Correct Answer โœ”โœ” A) Ag+ Calculate the atomic mass of silver if silver has 2 naturally occurring isotopes with the following masses and natural abundances: Ag-107 106.90509 amu 51.84% Ag-109 108.90476 amu 48.46% A) 107.79 amu B) 108.32 amu C) 108.19 amu D) 108.00 amu E) 107.90 amu -- Correct Answer โœ”โœ” C) 108.19 amu A hypothetical element, E, has only two naturally occurring isotopes: E- 46 with a mass of 46. amu and a natural abundance of 64.08%, and E-51 with a mass of 50.826 amu. What is the atomic mass of element E? A) 48.50 amu B) 47.76 amu C) 49.11 amu D) 47.44 amu E) 48.44 amu -- Correct Answer โœ”โœ” B) 47.76 amu A hypothetical element, E, has two naturally occurring isotopes: E-38 38.012 amu 75.68% E-46 45.981 amu 24.32% The element's atomic mass would be closest to which of the elements? A) K B) Ca C) Cl D) Sc E) Ar -- Correct Answer โœ”โœ” E) Ar How many moles of Kr are contained in 398 mg of Kr? A) 4.75 ร— 10-3 moles Kr

B) 1.19 ร— 10-4 moles Kr C) 2.99 ร— 10-3 moles Kr D) 33.4 moles Kr E) 2.11 ร— 10-4moles Kr -- Correct Answer โœ”โœ” A) 4.75 ร— 10-3 moles Kr How many iron atoms are contained in 354 g of iron? A) 9.50 ร— 10 22 Fe atoms B) 2.13 ร— 10 26 Fe atoms C) 3.82 ร— 10 24 Fe atoms D) 2.62 ร— 10 25Fe atoms E) 4.69 ร— 10 24Fe atoms -- Correct Answer โœ”โœ” C) 3.82 ร— 10 24 Fe atoms A 30.0 g sample of an element contains 3.47X 10^ atoms. Identify the element. A) Cr B) O C) Mg D) Fe -- Correct Answer โœ”โœ” A) Cr Which one of the following compounds contains ionic bonds? A) CaO B) SiO C) NI D) HF -- Correct Answer โœ”โœ” A) CaO