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16 Cards in this Set
- Front
- Back
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What is the law of conservation of mass? |
Mass is neither created nor destroyed during ordinary chemical reactions or physical changes |
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What is the law of multiple proportions |
if two or more different compounds are composed of the same two elements, then the ration of the masses of the second element combined with a certain mass of the first element is always a ration of small whole numbers |
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Who first proposed an atomic theory? |
Dalton
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What does Daltons atomic theory state? |
1.all matter is composed of extremely small particles called atoms 2.atoms of different elements are identical in size mass, and other properties. atoms of different elemens differ in size, mass, and other properties. 3.atoms cannot be subdived, created, or destroyed 4.atoms of different elements combine in sumple whole number ratios to form chemical compounds 5.In chemical reactions, atoms are combined, seperated, or rearraamged
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What parts of Daltons theory are incorrect today yo? |
atoms are divisble a given elemnt can have atoms with different masses |
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How was the electron discovered? |
Cathode ray experiment. |
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what was milikans experiment and what did it discover? |
His experiment was the oil drop and it discovered the charge of an electron |
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What did the cathode ray experiment find out about electrons |
the charge to mass ratio of them son
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Who discovered the nucleous |
Rutherford |
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What experiment was used to discover the nucleous |
gold foil experiment |
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What is an isotope |
an atom that has a different number of nuetrons |
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what's the difference between mass number and atomic mass numbner? |
Mass number is found by adding the mass of the protons and nuetrons within an atom. The atomic mass unit, is like the average of all the different types of isotopes for the given atom. |
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How is the relative atomic mass found |
comparing 1/12 the mass of a carbon 12 atom idget |
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how to average atomic mass |
Calculating Average Atomic Mass. The average atomic mass of an element is the sum of the masses of its isotopes each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope. |
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wt rngs u gt btch? |
rng of fllen gnts |
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wt r u? casul? |
im giant dad, step off |
