Which is one way that Dalton's atomic theory has been shown to be incorrect?

atoms can be split into subatomic particles

Which is not a part of Dalton's atomic theory?

An atom consists of a nucleus and a cloud of electrons.

An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?

An atom of sodium has 11 protons, 11 electrons, and 12 neutrons.

the number of protons in each atom of the element

Which part of atomic theory describes the law of multiple proportions?

atoms combine in small whole number ratios to form compounds

the total number of protons and neutrons in an atom

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Answers

1
Which is one way that Dalton's atomic theory has been shown to be incorrect?
atoms can change identity in chemical reactions
atoms can be destroyed in chemical reactions
atoms can be split into subatomic particles
atoms of different elements are identical
2
Find the average atomic mass: 95.72% is 115 amu and 4.28% is 113 amu.
114.00 amu
112.9 amu
114.91 amu
158.44 amu
3
The neutral atoms of all of the isotopes of the same element have
the same number of electrons.
equal numbers of neutrons.
different numbers of protons.
the same mass numbers.
4
The isotope Bromine-81 contains:
35 e, 81 p, 35 n
35 e, 46 p, 35 n
35 e, 35 p, 46 n
46 e, 46 p, 35 n
5
In carbon-14, the 14 represents the
isotope number
mass number
average atomic mass
atomic number
6
John Dalton thought that atoms
have no mass
cannot be broken down futher
are all composed of carbon
contain molecules
7
If the atomic number of an element is 6 and its mass number is 13, how many neutrons are contained in the nucleus?
13
8
6
7
8
Isotopes are atoms of the same element that have different
charges
atomic numbers
masses
number of electrons
9
Uranium-235 has 92 protons and 143 neutrons, what is the mass number?
235
impossible to determine
92
143
10
Which is not a part of Dalton's atomic theory?
All matter is composed of atoms.
In chemical reactions atoms are combined or rearranged
Atoms cannot be created or destroyed.
An atom consists of a nucleus and a cloud of electrons.
11
An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?
An atom of sodium has 11 protons, 12 electrons, and 12 neutrons.
An atom of sodium has 11 protons, 11 electrons, and 11 neutrons.
An atom of sodium has 11 protons, 12 electrons, and 11 neutrons.
An atom of sodium has 11 protons, 11 electrons, and 12 neutrons.
12
What is the definition of one atomic mass unit?
1/12 the mass of carbon-12
1/12 the mass of any atom
1 mol of any element
1 g of any element
13
The atomic number is
1 mol of the element
the number of neutrons in each atom of the element
the mass of the element
the number of protons in each atom of the element
14
Consider the species ⁷²Zn, ⁷⁵As and ⁷⁴Ge. These species have:
the same number of electrons.
the same number of neutrons.
the same number of protons.
the same number of protons and neutrons.
15
Every sample of a substance contains the same % elements is known as the law of
multiple proportions
definite proportions
conservation of mass
conservation of energy
16
Which part of atomic theory describes the law of multiple proportions?
all matter is composed of atoms
atoms of a given element are identical
atoms cannot be subdivided, created, destroyed
atoms combine in small whole number ratios to form compounds
17
Mass number is
the total number of electrons in an atom
the total number of protons and neutrons in an atom
the total number of protons in an atom
the average atomic mass of an element
18
Who discovered the proton?
Chadwick
Dalton
Goldstein
Thomson
19
Cathode ray tube experiments led to the discovery of the
nucleus
proton
electron
neutron

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