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28 Cards in this Set
- Front
- Back
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What is matter?
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anything that has mass and takes up space
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What are the three levels of observing matter?
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Macroscopic(viewable with the naked eye), Microscopic(viewable with the aided eye), particulate(too small to be seen by an microscope)
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What is a model?
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Something that is used to represent something too large or too small
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What is the kinetic molecular theory?
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the particles of matter are always moving. Kinetic means motion.
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What are the three states of matter?
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Gas, liquid, solid
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What is a physical property of matter?
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A property that can be observed and measured with a chemical change
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What is a physical change?
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change in form with no change in identity
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What is chemical property?
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the types of chemical change a substance is able to experience
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What is a physical change?
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change in form with no change in identity
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What is a chemical change?
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identity of original substance changes to something new
A change in which one or more substance disappear and one or more new substance form |
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What is a pure substance?
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one chemical with distinct set of physical and chemical properties; cannot be separated by physical changes
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What is a mixture?
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two or more pure substances; properties vary, depending on the relative amounts of pure substances; components can be separated by physical changes
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What is homogeneus matter?
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same appearance, composition, properties throughout
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What is a solution?
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a homogenous mixture
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What is heterogeneous matter?
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different phases of the matter are visible, variable properties in different parts of sample
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What is an element?
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a pure substance, cannot be decomposed chemically into other pure substances
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What is a compound?
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pure substance that can be decomposed chemically into other pure substances
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What is an elemental symbol? How is it written?
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the letter that symbolize an element
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What is a formula compound?
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elemental symbols of elements in a compound with subscripts showing the number of atoms of each element
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What is an atom?
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the smallest unit particle of an element
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What is a molecule?
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the smallest unit particle of a pure substance that can exist independently and retain the identity of that substance
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What is the law of electrostatic forces?
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Objects with the same charges repel each other
Objects with opposite charges attract each other |
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What is an exothermic change?
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a change in which energy is release, usually in the form of heat
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What is an endothermic change?
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a change in which energy is absorbed, usually in the form of heat
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What is potential energy?
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energy because of position in force field.
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What is the Conservation Law?
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mass can be changed to energy
total mass plus energy is constant |
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What is the law of conservation of mass?
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mass conserved in chemical change neither created or destroyed
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What is the law of conservation of energy?
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energy is conserved in ordinary change, neither created or destroyed
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