DCE Chemistry Unit 1 Vocabulary
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| matter | anything that has mass and occupies space
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| chemistry | the study of the composition of matter and the changes that matter undergoes
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| scientific method | a logical, systematic approach to the solution of a scientific problem (making observations, testing hypotheses, developing theories)
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| observation | information obtained through the senses, often involving a measurement
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| hypothesis | a proposed explanation for an observation
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| experiment | a repeatable procedure that is used to test a hypothesis
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| independent variable | the variable that is changed during an experiment, also called a manipulated variable
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| dependent variable | the variable that is observed during an experiment, also called a responding variable
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| model | a representation of an object or event
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| graduated cylinder | glassware used for measuring volume of a liquid
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| beaker | glassware used for containing and mixing but not for measuring
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| balance | instrument used for measuring mass
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| significant figure | the digits that can be known precisely in a measurement plus an estimated digit
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| density | a measure of how packed together the particles in a substance are; mass divided by volume
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| mass | the amount of matter in an object
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| volume | the amount of space occupied by an object
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| physical change | a change in appearance but not in identity
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| chemical change | a change that produces a new substance
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| dimensional analysis | a method of problem solving that uses the units to help solve the problem
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| combustion | a chemical reaction in which a fuel and oxygen react to form carbon dioxide and water
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| precipitate | a solid that forms and settles out of a liquid mixture
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| freezing point | the temperature at which a liquid changes to a solid
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| melting point | the temperature at which a solid changes to a liquid
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| signs of chemical change | formation of a gas, formation of a precipitate, change in energy, change of color or odor
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| tare technique | a technique for finding the mass of an object by using the balance to zero out the mass of the container
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| absolute technique | a technique for finding the mass of an object by weighing the empty container and subtracting it from the mass of the container with the object in it
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| reactant | material that is present at the start of a reaction
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| product | material that is formed in a chemical reaction
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| solid | state of matter that has a definite volume and definite shape
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| liquid | state of matter that has a definite volume and does not have a definite shape
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| gas | state of matter that has no definite volume and no definite shape
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| mixture | a blend of two substances that are not chemically combined
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| heterogeneous mixture | a mixture that is not uniform in composition
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| homogeneous mixture | a mixture that is uniform in composition
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| element | the simplest form of matter; cannot be broken down further by chemical means
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| compound | a substance made of two or more elements that are chemically combined
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| freezing | changing from the liquid state to the solid state, requires the removal of energy
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| melting | changing from the solid state to the liquid state, requires the addition of energy
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| condensation | changing from the gas state to the liquid state, requires the removal of energy
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| evaporation | changing from the liquid state to the gas state, requires the addition of energy
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| sublimation | changing from the solid state to the gas state without going through the liquid state
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| depositon | changing from the gas state to the solid state without going through the liquid state
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