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Terms
Terms for Chem test
22
Chemistry
11th Grade
03/22/2009

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Term
Scientific Law
Definition
A concise statement that summarizes the results of many observations and experiments
Term
Homogeneous
Definition
A mixture in which the composition is uniform throughout
Term
Heterogeneous
Definition
A mixture which composition is not uniform throughout
Term
Mixture
Definition
A physical blend of two or more components
Term
Hypothesis
Definition
A proposed explanation for an observation
Term
Reactant
Definition
A substance present at the start of a reaction
Term
Product
Definition
A substance produced in a reaction
Term
Catalyst
Definition
A substance that increases the rate of reaction by lowering the activation-energy barrier; the catalyst is not used up in the reaction
Term
Doberman's triads
Definition
Groups of 3 elements with similar properties
Term
Compound
Definition
Is a substance that contains two or more elements chemically combined in fixed proportion
Term
Specific Gravity
Definition
Is the ratio of the density of a given solid or liquid substance to the density of water at a specific temperature and pressure
Term
Density
Definition
Is the ratio of the mass of an object to its volume
Term
Element
Definition
Is the simplest form of matter that has a unique set of properties
Term
(pure) Substance
Definition
Matter that has a uniform and definite composition
Term
Avogrado's Hyptothesis
Definition
States that equal volumes of gases measured at the same temperature and pressure contain the same numbers of particles
Term
The law of definite proportion
Definition
states that in samples of any chemical compound, the masses of the elements are always in the same proportions
Term
Responding or dependent variable
Definition
The variable that is observed during the experiment
Term
Manipulated or independent variable
Definition
The variable that you change in an experiment
Term
Absolute Zero
Definition
The zero point of the kelvin scale is 0k
Term
Theory
Definition
Well-tested explanation for a broad set of observations
Term
Periodic Law
Definition
When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties
Term
The law of multiple proportions
Definition
whenever the same two elements form more than
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