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8th grade Science

TermDefinition
Matter the substance that is seen all around us, consists of anything that has mass and volume.
Element a substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means.
Compound a pure, homogeneous substance consisting of atoms or ions of two or more different elements in definite proportions that cannot be separated by physical means. A compound usually has properties unlike those of its constituent elements.
Mixture a composition of two or more substances that are not chemically combined with each other and are capable being separated.
Pure substance a sample of matter, either an element or a compound, that consists of only one component with definite physical and chemical properties and a definite composition.
Chemical change a process where bonds are broken and new bonds are formed between different atoms.
Physical change a usually reversible change in the physical properties of a substance, as size or shape.
Gas a substance having no definite shape and no definite volume. The molecules are spread out and free to move.
Liquid a substance having a definite volume, but no definite shape. The intermolecular forces hold these atoms or molecules loosely together but do not force them into a rigid structure allowing liquids the ability to flow.
solid a substance having a definite shape and definite volume. The atoms or molecules are held in rigid structure. Although they are free to vibrate, they cannot move around.
Plasma gases that have been so energized that their atoms have been stripped of some or all electrons.
Pressure the force exerted on a surface per unit area.
Volume the amount of space that a substance or object occupies.
Density the ratio of the object's mass to its volume. The formula is d = m / V.
Chemical property a characteristic of a substance that can be observed during a reaction in which the chemical composition or identity of the substance is changed.
Physical property a characteristic of a substance that can be observed or measured without changing the identity of the substance
Melting a physical process that results in the phase transition of a substance from a solid to a liquid.
Freezing physical process that results in the phase transition of a substance from a liquid to a solid.
Condensation physical process that results in the phase transition of a substance from a gas to a liquid.
Vaporization physical process that results in the phase transition of a substance from a liquid to a gas.
Sublimation a physical process that results in the phase transition of a substance from a solid directly to a gas without first becoming a liquid.
Deposition a physical process that results in a phase transition of a substance from a gas directly to a solid without first becoming a liquid. It is the opposite of sublimation.
Created by: Karinat.18