Which of the following is not part of Dalton's atomic theory?

The number of protons in an atom is its atomic number

Which of the following is a fusion reaction?

Cu-246 combining with C-12 to form No-254 and 4 neutrons

The atomic number of oxygen, 8, indicates that there are 8

protons in the nucleus of an oxygen atom

Which statement is true about half-lives?

Each radioactive isotope has its own half-life

The law of definite proportions

agrees with Dalton's atomic theory

the # of particles in 1 mole of a pure substance.

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Unit 3 Review

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Questions 22

Answers

1
If 4.0 g of element A combine with 10. g of element B, then 12 g of element A combine with ____ g of element B.
10
30
24
12
2
Which concept in Dalton's atomic theory has been modified?
All matter is composed of atoms
Atoms of different elements have different properties and masses
Atoms cannot be divided
Atoms can combine in chemical reactions
3
The principles of atomic theory recognized today were conceived by
Rutherford
Avogadro
Bohr
Dalton
4
According to the law of definite proportions, any two samples of KCl have
the same mass
the same melting point
the same ratio of elements
slightly different molecular structures
5
Which of the following is not part of Dalton's atomic theory?
In chemical reactions, atoms are combined, separated, or rearranged
All matter is composed of extremely small particles called atoms
The number of protons in an atom is its atomic number
Atoms cannot be divided, created, or destroyed
6
Isotopes are atoms of the same element that have different
numbers of protons
principal chemical properties
masses
numbers of electrons
7
Because most particles fired at metal foil passed straight through, Rutherford concluded that
atoms were indivisible
atoms contained no charged particles
atoms were mostly empty space
electrons formed the nucleus
8
Beta particles are
helium nuclei
electromagnetic waves
electrons
neutrons
9
A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
nuclide
electron
neutron
isotope
10
Which of the following is a fusion reaction?
U-235 absorbing a neutron and splitting into Xe-140, Sr-94, and 2 neutrons
C-14 decaying into N-14 and a beta particle
hydrochloric acid combining with sodium hydroxide to form NaCl and H2O
Cu-246 combining with C-12 to form No-254 and 4 neutrons
11
Protons within a nucleus are attracted to each other by
nuclear forces
opposite charges
electron repulsion
their energy levels
12
The atomic # of neon is 10. The atomic # of calcium is 20. Compared with a mole of neon, a mole of calcium contains
an equal number of atoms
twice as many atoms
20 times as many atoms
half as many atoms
13
The atomic number of oxygen, 8, indicates that there are 8
protons in the nucleus of an oxygen atom
neutrons outside the oxygen atom's nucleus
oxygen nuclides
energy levels in the oxygen atom's nucleus
14
Phosphorus-33 (atomic number 15) contains
18 neutrons
18 protons
33 protons
33 neutrons
15
Which statement is true about half-lives?
Different atoms of the same nuclide have different half-lives
Each radioactive isotope has its own half-life
All radioactive nuclides have the same half-life.
All radioactive nuclides of an element have the same half-life
16
Whose series of experiments identified the nucleus of the atom?
Dalton
Bohr
Rutherford
Chadwick
17
Alpha particles are
neutrons
helium nuclei
electrons
electromagnetic waves
18
The average atomic mass of an element is the average of the atomic masses of its
artificial isotopes
radioactive isotopes
two most abundant isotopes
naturally occurring isotopes
19
The law of definite proportions
agrees with Dalton's atomic theory
assumes that atoms of all elements are identical
replaced the law of conservation of mass
contradicted Dalton's atomic theory
20
Avogadro's number is
the # of protons and neutrons that can fit in the shells of the nucleus
the # of particles in exactly 1 gram of a pure substance.
the maximum # of electrons that all the energy levels can accommodate
the # of particles in 1 mole of a pure substance.
21
An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
27
40
13
14
22
The total number of protons and neutrons in the nucleus of an atom is its
Avogadro's number
average atomic mass
mass number
atomic number

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