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Chemistry Ch. 4/5.1 Review Questions Flashcards | StudBud
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Chemistry Ch. 4/5.1 Review Questions
Chemistry Ch. 4/5.1 Review Questions
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1
How do the isotopes hydrogen-1 and hydrogen-2 differ?
Hydrogen-2 has one proton; hydrogen-1 has none
Hydrogen-2 has one neutron; hydrogen-1 has none
Hydrogen-2 has one more electron than hydrogen-1
Hydrogen-2 has two protons; hydrogen-1 has one
2
The atomic mass of an element depends upon the...
Mass of each electron in that element
relative abundance of protons in that element
Mass of each isotope of that element
Mass & relative abundance of each isotope of that element
3
Which of the following was one of Dalton's improvements over Democritus's ideas?
Atoms retain their identity in a chemical reaction
Atoms are indestructible
Matter consists of tiny particles called atoms
Atoms are indivisible
4
Which of the following statements is true?
Atoms of isotopes of an element have diff #'s of electrons
Atoms of isotopes of an element have diff #'s of neutrons
Atoms of the same element all have the same mass
Atoms of isotopes of an element have diff numbers of protons
5
How does the energy of an electron change when the electron moves closer to the nucleus?
It increases
It decreases
It stays the same
It doubles
6
In the Bohr model of the atom, an electron in an orbit has a fixed......
Position
Color
Energy
Size
7
Who lived from 460 B.C-370 B.C. & was among the first to suggest the idea of atoms?
Dalton
Aristotle
Democritus
Thomson
8
Isotopes of the same element have different_______.
Atomic numbers
Chemical behavior
Mass numbers
Positions on the periodic table
9
Which of the following is true about subatomic particles?
Neutrons have no charge & are lightest
Electrons are negatively charged & are the heaviest
Protons are positively changed & the lightest
The mass of a neutron nearly equals the mass of a proton
10
Emission of light from an atom occurs when an electron....
Jumps from a lower to a higher energy level
Moves within its atomic orbital
Falls into the nucleus
Drops from a higher to a lower energy level
11
What does the number 84 in the name Krypton-84 represent?
Atomic Number
Twice the number of protons
Mass Number
Sum of protons & electrons
12
Element has atomic number of 76. The # of protons & electrons in a neutral atom of the element_
76 protons & 76 electrons
38 protons & 38 electrons
76 protons & 0 electrons
152 Protons & 76 electrons
13
Dalton's atomic theory included which idea?
Individual atoms can be seen with a microscope
Atoms of the same element are always identical
All atoms of all elements are the same size
Atoms of different elements always combine in 1 to 1 ratios
14
Which discovery did J.J. Thompson make that improved upon Dalton's atomic theory?
Atoms contain tiny, negatively charged electrons
Atoms are always in motion
Atoms that combine do so in simple whole-number ratios
Atoms contain a tiny, positively charged nucleus
15
The particles that are found in the nucleus of an atom are ____________?
Protons & Neutrons
Electrons only
Protons & Electrons
Neutrons & Electrons
16
According to Heisenberg uncertainty principle:the position of a tiny moving particle is known..
Mass of the particle cannot be exactly determined
Velocity of the particle cannot be exactly determined
Charge of the particle cannot be exactly determined
Spin of the particle cannot be exactly determined
17
Which scientist developed the quantum mechanical model of the atom?
Erwin Schrodinger
Niels Bohr
Albert Einstein
Ernest Rutherford
18
Which of the following is correct concerning subatomic particles?
Cathode rays were found to be made of protons
The electron was discovered by Goldstein in 1886
The neutron was discovered by Chadwick in 1932
The proton was discovered by Thompson in 1880
19
Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised?
Compounds are made by combining atoms
Atoms of any one element are diferent from any other element
Atoms are tiny indivisible particles
Atoms of diff. elements combine w/ 1 another in whole ratios
20
Which sets is the symbol of the element, the # of protons, & # of electrons given correctly
In, 49 protons, 49 electons
Zn, 30 protons, 60 electrons
F, 19 protons, 19 electrons
Cs, 55 protons, 132.9 electons
21
Bohr's model could only explain the spectra of which type of atoms?
Single atoms with more than one electron
Single atoms with one electron
Bonded atoms with one electron
Bonded atoms with more than one electron
22
The quantum mechanical model of the atom....
Was proposed by Niels Bohr
Defines the exact path of an electron around the nucleus
Has Probability of finding an electron in certain positions
No longer requires the concept of energy levels
23
How many protons, electrons, & neutrons does an atom with atomic number 50 & mass #125 contain?
75 electrons, 50 protons, 50 neutrons
70 neutrons, 75 protons, 50 electrons
50 protons, 50 electrons, 75 neutrons
120 neutrons, 50 protons, 75 electrons
