Glossary of Chemistry Chapter 3: Atome- Building Blocks of Matter
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- The earliest particle theory was deveolped by?
- democritus in 400
- Demcritus called natures basic particle the what?
- The fact the chemical compound contains the same elements in exactly the same proportiond by mass regardless of the size of the sample or source of the coumpound
- law of definite proportions
- if 2 or more drifferent compounds are composed of the same 2 elemnts, then thre ratio of masses of the 2nd elemnt combined with a certain mass of the 1st elemnt in always a ratio of small whole #s
- law of multiple proportions
- mass is neither destryoed nor created during ordinary chemical reactions or physical change
- law of conservation of mass
- all matter is composed of extremely samll partcles called atoms?
- atoms of a given elemnt are identicale in size, mass, and other properties?
- atoms cannot be subdivied, created, destroyed?
- atoms of different elements combined in simple whole# ratios to form chemical compoundas?
- in chemical reactions, atoms are combined, seperated, or rearanged?
- What are the 2 parts of Dalton's theory that is not correct?
- 1. atoms are divisble into smaller particles
2. a given element can ahve atoms wiht different masses
- the smallest particle of an elemnt that retains the chemical properties of the element
- What are the parts of the atom?
- nucleous, proton, nuetron, electron, and subtomic particles
- Whose experiment revelaed that the electron has a neg. charge?
- JJ Thomson
1897 (Plum Pudding)
- Who confirmed that the electron has a neg. chatge?
- What was the gold foil experiment?
- Rutherfors, Geiger,& Marsden bobarded a thin, gold foil with fast moving alpha particle.
- short-range, proton-nuetron, proton-proton, and nutron-nitron forces hold the nuclear particles together
- nuclear forces
- the region occupied by the electrons
- electron cloud
- the distance from the center of the nucleous to the outer portion of the electron cloud is
- radious of an atom
- atoms of the same elemnt that have different masses
- the total # of protons and nuetrons in the nucleous of an isotoep
- mass #
- the weighted ave. of the atomic masses of the naturally occurring isotopes of an element
- average atomic mass
- the mass if ine mole of a pure substance
- molar mass
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