 | Term | Definition |
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Whose model of the atom was represented by a solid sphere? |
Dalton |
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Which scientist concluded that atoms consist of subatomic particles? |
Thomson |
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Whose model of an atom was represented by positive and negative charges and determined they were distributed evenly throughout the atom? |
Bohr |
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Which scientist used the gold foil experiment to prove that a positive charge was centered in the nucleus of the atom? |
Rutherford |
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Which scientist developed a theory based on the fact that compounds always combined in a fixed ratio? |
Dalton |
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What are the important points to Dalton's theory? |
allelements are composed of atoms, all atoms of the same elements have the same mass and atoms of different elements have different masses, compounds contain atoms of more than one element, and in a particular compound atoms of different elements always combine in the same way |
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What has no definite shpae or definite volume? |
gas |
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What do collisions of helium atoms and the walls of a closed container cause? |
gas pressure |
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What factors affect the pressure of an enclosed gas? |
temperature, volume, and the number of particles |
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What happens to the volume of a gas if the temperature remains the same as the pressure of the gas increases? |
it decreases |
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What does Charles's law state? |
the volume of a gas is proportionate to its temperature (in Kelvins) if the pressure and nimber of particles remains constant |
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What is vaporization? |
the phase change that is the reverse of condensation |
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What is sublimation? |
the phase change in which a substance changes from a solid to a gas or vapor without changing to a liquid |
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What is an example of an exothermic change in a phase change? |
deposition |
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What increases as the volume of a gas decreases? |
the pressure |
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What happens during an exothermic change? |
the system releases energy to its surroundings |
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What is the term for a change from a gas to a liquid? |
condensation |
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What is vaporization? |
change from a liquid to a gas |
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What is an example of a change from a liquid to a solid? |
freezing |
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How are elements arranged on the periodic table? |
by increasing atomic number |
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How can elements be classified? |
metal, non-metal, or metalloid OR solid, liquids or gases |
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What category is the largest percent of elements on the periodic table? |
metals |
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What is the symbol for silver? |
Ag |
| |
What is the symbol for sulfur? |
S |
