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The Law of Conservation of Mass follows from the concept that

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Atoms are indivisible

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If two or more compounds are composed of the same two elements, the ratio of the masses of element that combine with a fixed mass of the other element is a simple whole number. This is a statement of the law of

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Multiple proportions

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the law of multiple proportions can be partly explained by the idea that

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Element combine to form compounds

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Who was the schoolmaster who studied chemistry and proposed an atomic theory

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John Dalton

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Who first recognized that the ratio of them number of atoms that combine is the same as the ratio of the masses that combine

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John Dalton

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The principle of atomic theory recognized today were conceived by

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Dalton

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According to Dalton's atomic theory, atoms

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Of each element are identical in size, mass and other properties

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Which of the following is NOT part of Dalton's atomic theory

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The number of protons in an Atom is its atomic number

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According to Dalton's atomic theory, atoms

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Of different elements combine in simple whole-number ratios to form compounds

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Dalton's atomic theory did NOT explain the law of

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Conversation of energy

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The law of definite proportions

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Contradicted Dalton's atomic theory

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Dalton's atomic theory help to explain the law of conservation of mass because it stated that atoms

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Could not be created or destroyed

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Who proposed the law of multiple proportions

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Dalton

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Dalton's atomic theory essentially agreed with the present atomic theory EXCEPT for the statement that

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All atoms of the same element have the same mass

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Which of the following statements is true

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Atoms of the same element may have different masses

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Which concept in Dalton's atomic theory has been modified

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Atoms cannot be divided

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The atom's theory proposed by Dalton

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Has been expanded and modified

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In early experiments of electricity and matter, an electrical current was passed through a glass tube containing

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Gas under low pressure

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When an electrical current passed through a glass tube, a paddle wheel placed between the electrode moved. Scientists concluded that

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Particles were passing form the cathode ray to the anode

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In glass tube , electrical current passed through for the negative electrode called the , to the other electrode

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Cathode

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The Rays produced in a cathode tube in a early experiment were

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Deflected away from a negative plate

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The behavior of cathode Rays produced in a glass tube containing gas at low pressure led scientists to conclude that the Rays

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We're composed of negatively charged particles

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After measuring the ratio of the charge of a cathode ray particle to its mass.Thomson concluded that the particles

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Had a very small mass

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Experiment with cathode Rays led to the discovery of the

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electron

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Millikan's experiments

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Measured the charge on the electron

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The discovery of cathode Rays in Thomson's experiments was evidence of the Nature of electron

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Charged

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Who discovered the nucleus by bombarding gold foil with positively charged particles and nothing that some particles were widely deflected

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Rutherford

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The discovery of the electron results from experiments using

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Cathode ray

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In Rutherford's experiments, very few positively charged particles

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We're greatly deflected back from the metal

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In Rutherford's experiments, positively charged particles

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Were used to bombard thin metal foil

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In Rutherford's experiments,mostly of the particles

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Passed through the foil

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Because most particles fired at metal foil passed straight through, Rutherford concluded that

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Atoms were mostly empty

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Because a few positively charged particles bounced back from the foil, Rutherford concluded that such particles were

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Repelled by densely packed regions of positive charge

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Rutherford's experiment led to the discovery of the

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Nucleus

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Rutherford's experimental results led him to conclude that atoms could matin massive central regions that have

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A positive charge

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Rutherford fired positively charged particles at metal foil ad concluded that most of the mass of an atoms was

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Concentrate in the nucleus

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What did Rutherford conclude about the structure of the Atom

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An atom contain a small, dense, positively charged particles central region

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In Rutherford's experiments, the backwards deflection of alpha particles gave evidence of an atom's

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Nucleus

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A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a

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Neutron

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The nucleus of an atom has all of the following characteristics EXCEPT that is

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Contains nearly all of the atom's volume

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