law of conservation of mass
mass is neither created nor destroyed during ordinary chemical reactions or physical changes
law of multiple proportions
if two or more compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers
atoms
The first statement of Dalton's atomic theory states that: All matter is composed of extremely small particles called _____
identical, differ
The second statement of Dalton's atomic theory states that: Atoms of an element are _______ in size, mass, and other properties. Atoms of different elements _____ in size, mass, and other properties.
atoms
The third statement of Dalton's atomic theory states that: _____ cannot be subdivided, created, or destroyed.
combine
The fourth statement of Dalton's atomic theory states that: Atoms of different elements ______ in simple whole-number ratios to form chemical compounds.
chemical
The fifth statement of Dalton's atomic theory states that: In _______ reactions, atoms are combined, separated, or rearranged.
electrons
Thomson used the cathode ray tube to discover what
nucleus
Rutherford used the "shooting gallery" to discover what
protons
Milikan used the oil drop to discover what
isotopes
atoms of the same element that have different masses
6.022x10^23
what is Avagadro's number
molar mass
the mass of one mole of a pure substance
mole
the amount of a substance that contains as many particles as there are atoms in exactly 12 grams of carbon-12
atomic number
the number of protons in each atom of an element
number of protons
what aspect of the atomic structure determines the characteristics of an element?
unknown, known
when converting, you take what is _______ divided by the _______
atomic weight
when converting from grams to moles, divide by the _____ _____
6.022x10^23
when converting from moles to atoms, multiply by _________
atomic number
The number of protons equal to the ________
atomic number
The number of electrons is equal to the ________
weight, number
to find the number of neutrons, take the atomic ______ minus the atomic ______
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