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33 Cards in this Set
- Front
- Back
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Who was the first person to coin the term atomos?
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Democritus
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What does atomos mean in English?
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Unbreakable
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Who was the first person to show experimental evidence that atoms existed?
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Robert Boyle
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Matter
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Anything that has mass and occupies space
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Atom
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A particle that cannot be broken down, the basic unit of matter
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Molecule
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A particle made of atoms stuck together with chemical bonds
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Element
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A group of atoms (or sometimes molecules). All the atoms are identical (even within the molecules).
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Compound
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A group of molecules. All the molecules are identical. Within these molecules, there are more than 1 type of atm.
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Pure Substance
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A group of particles in which all the particles are identical
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Mixture
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A group of particles in which the particles are not identical
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Homogenous mixture
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A mixture that is the same throughout, uniform
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Heterogeneous mixture
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A mixture that is not the same throughout
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Filtration: separation by...
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Size
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Distillation: separation by...
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Boiling points
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Settling: separation by...
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Density
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What is the difference between evaporation and boiling?
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Evaporation is possible at many different temperatures and boiling only happens at a specific temperature.
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Solid to liquid
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Melting
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Liquid to gas
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Boiling
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Gas to liquid
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Condensation
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Liquid to solid
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Freezing
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What causes atoms to speed up?
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Heat
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What phase is compressible?
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Gas phase.
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What phase is the densest?
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Solid
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What phase has no definite shape?
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Liquid and gas
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What phase fills the container?
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Gas
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4 indications of chemical change
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Color change
Producing gas Precipitation Release of heat or light |
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Physical Property
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Characteristics of substances that differentiate them from one another.
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Chemical Property
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Substances react with one another and transforms the substances.
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Physical Change
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Physical properties have changed but the chemical composition remains the same.
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Chemical Change
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When chemical bonds are broken or formed.
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Physical changes are reversible.
True or false. |
True
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Heat
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It's the energy of moving particles
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Explain how the compressibility of gases supports the belief that matter is made out of atoms.
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If there was no empty space, compressing gas would not be possible
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