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8th Science TCAP

Vocabulary that will appear on the 8th grade Science TCAP

Asexual Reproduction Reproduction that does not involve the union of sex cells and in which one parent produces offspring that are genetically identical or the parent.
Chemical Equation A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products.
Classification The division of organsims into groups, or classes, based on specific characteristics.
Compound A substance made up of atoms of two or more different elements joined by chemical bonds.
Concentration The amount of a particular substance in a given quantity of a mixture, solution, or ore.
Density The ratio of the mass of a substance to the volume of the substance.
Dichotomous Key An aid that is used to identify organisms and that consists of the answers to a series of questions.
Element A substance that cannot be separated or broken down into simpler substances bu chemical means.
Endothermic Reaction A chemical reaction that requires heat.
Extinction The death of every member or a species.
Fossil The trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock.
Inertia The tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object.
Law of Conservation of Mass The law that states that mass cannot be created or destroyed in ordinary chemical and physical changes.
Molecule The smallest unit of a substance that keeps all of the physical and chemical properties of that substance.
Nucleus In physical science, an atom's central region, which is made up of protonsa and neutrons.
pH A value that is used to express the acidity or alkalinity of a system.
Product A substance that forms in chemical reaction.
Reactant A substance or molecule that particpates in a chemical reaction.
Relative Age The approximate age or fossils or other objects in rock layers determined by comparing whether the surrounding rock layers are younger or older.
Sexual Reproduction Reproduction in which the sex cells from two parents unite to produce offspring that share traits from both parents.
Species A group of organisms that are closely related and can mate to produce fertile offspring.
Volume A measure of the size of a body or region in three-dimensional space.
Weight A measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe.
Created by: kmk3n