Dalton incorporated the law of conservation of mass into his atomic theory by asserting that ...
Atoms are indivisible
If each atom of element D has 3 mass units and each atom of element E has 5 mass units, a molecule composed of one atom of each D and E has. ___ mass units?
8 mass units
If 4.0g of element A combine with 10g of element B, then 12g of element A combine with ___g of element B?
If 6.0g of element K combine with 17g of element L, how many grams of element K combine with 85g of element L?
In oxides of Nitrogen, such as N20, N0, N02, and N203, atoms combine in small whole-number ratios. This evidence supports the law of ...
If two or more compound are composed of the same two elements, the ratio of the masses of one element that combine with a fixed mass of the other element is a simple whole number. This is a statement of the law of...
Oxygen can combine with carbon to form two compounds, carbon monoxide and carbon dioxide. The ratio of the masses of oxygen that combine with a given mass of carbon is 1:2. This is an example of
the law of multiple proportions
According to the law of definite proportions, any two samples of KCl have
the same ratio of elements
According to the law of conservation of mass, when sodium, hydrogen, and oxygen react to form a compound, the mass of the compound is ___ the sum of the masses of the individual elements.
What is the ratio of oxygen to carbon when 32g of oxygen combine with 12g of carbon?
The principles of atomic theory recognized today were conceived by
The law of definite proportions
agrees with daltons atomic theory
According to Daltons atomic theory, atoms
of each element are identical in size, mass, and other properties
Which of the following is NOT part of Daltons atomic theory?
the number of protons in an atom is its atomic number
Daltons atomic theory agrees with modern atomic theory except for the statement that
atoms are not divided in chemical reactions
Which of the following statements is true according modern atomic theory?
atoms of the same element may have different masses
which concept in Daltons atomic theory has been modified?
atoms cannot be divided
The atomic theory proposed by dalton has been
expanded and modified
In the early experiments on electricity and matter, an electrical current was passed through a glass tube containing...
gas under low pressure
in a glass tube attached to a voltage source, electrical current passes from the negative electrode, called the ___, to the other electrode
When an electrical current passed through a glass tube, it caused the surface of the tube directly across from the cathode to glow. Scientist concluded that
the particles of the beam were negatively charged
The rays produced in a cathode tube are
deflected away from a negative plate
Experiments with cathode rays led to the discovery of the
after measuring the ratio of the charge of a cathode-ray particle to its mass, Thomson concluded that the particles
had a very small mass
Because any element used in the cathode produced electrons, scientist concluded that
all atoms contained electrons
the deflection of cathode rays in Thomsons experiments was evidence of the ___ nature of electrons
whose series of experiments identified the nucleus of the atom
in rutherfords experiments, alpha particles
were used to bombard thin metal foil
in rutherfords experiments, most particles
passed through the foil
because most particles fired at metal foil passed straight through, rutherford concluded that
atoms were mostly empty space
because a few alpha particles bounced back from the foil, rutherford concluded that they were
repelled by densly packed regions of positive charge
rutherfords experiments led him to conclude that atoms contain massive central regions that have
a positive charge
a positively charged particle with mass 1.673 X 10-24g is a(n)
a nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
the nucleus of an atom has all the following characteristics except that it
contains nearly all of the atoms volume
which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom?
protons within a nucleus are attracted to each other by
the nuclear force
an atom is electrically neutral because
the number of protons and electrons are equal
nuclear forces exxsist because the particles in hte nucleus are
most of the volume of an atom is occupied by the
The charge due to the electrons of a neutra atom
balances the charge on the nucleus
the smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the
the radius of an atom extends to the outer edge of the
region occupied by the electrons
isotopes are atoms of the same element that have different
the msot common form of hydrogen has
the tritium atom consist of
one proton, tow neutrons, and one electron
what is the mass number of deuterium
how many isotopes of hydrogen are known?
the hydrogen isotope with the least mass is named
the nucleus of deuterium contains one proton and
the atomic number of oxygen, 8, indicates that there are eight
protons in the nucleus of an oxygen atom
the total number of protons and neutrons in the nucleus of an atom is its
as the mass number of an elements isotopes of an element increases, the nmumber of protons
remains the same
as the atomic number increases, the number of electrons in a neutral atom
all atoms of the same element have the same
atoms of the same element can differ in
in determining the atomic mass of elements, the standard is the
the relative atomic mass of an atom can be found by comparing the mass of the atom to the mass of
one atom of carbon- 12
the carbon-12 atoms is assigned a relative mass of exactly
the average atomic mass of an element is the average of the atomic masses of its
naturally occuring isotopes
the atomic mass of an element listed in the periodic table is the
average atomic mass
an aluminum isotope consist of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
chlorine has atomic number 17 and mass number 35. it has..
17 protons, 17 electrons, and 18 neutrons
carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils, has
Phosphorus-33 (atomic number 15) contains
Neon-22 contains 12 neutrons. it also contains
the number of atoms in 1 mol of carbon is
6.022 X 10^23
the number of atoms in a mole of any pure substance is called
the atomic number of neon is 10. the atomic number of calcium is 20. compared with a mole of neon, a mole of calcium contains
an equal number of atoms
to determine the molar mass of an lement, one must know the elements
number of isotopes
avogardos number is
the number of particles in 1 mole of a pure substance
molar mass is
the mass in grams of one mole of a substance, and is numerically equal to the average atomic mass of the element
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