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ACT Science Glossary of Terms #1

Teacher: Mrs. S. Vandervort
A substance that is a proton donor. The pH of an acid is less than 7.
The closeness of an experimental measurement to the accepted or theoretical value
An agent that changes the rate of a reaction, without itself being altered by the reaction
The rate that velocity changes per unit time and the direction it changes in. Computed from the change in velocity divided by the change in time. Common units are meters per second squared.
An organelle found primarily in plant cells and fungi cells, and also some bacteria. The cell wall is a strong structure that provides protection, support, and allows materials to pass in and out without being selectively permeable
The extension of the Earth's north and south pole onto the celestial sphere
A substance that is a proton acceptor. The pH of a base is greater than 7.
The extension of the Earth's equator out onto the celestial sphere
The examination of the performance of an instrument in an experiment whose outcomes are known, for the purpose of accounting for the inaccuraces inherent in the instrument in future experiments whose outcomes are not known.
A solution in which the solvent is water
Vascular tissue that receives blood from the arterioles and releases the blood to the venuoles
The vascular tissue which carries blood away from the heart
The chambers of the heart tha receive blood
The study of planets, stars, and space
A process that involves the formation or breaking of chemical bonds.
A stage in the scientific method where patterns of observations are made
An organelle found in all cells that acts as the passageway through which materials can pass in and out. this organelle is highly selectively permeable, only allowing materials to pass through that it "chooses" chemically
The net force that acts to result in the centripetal acceleration. It is not an individual force, but the sum of the forces in the radial direction. It is directed toward the center of the circular motion.
The imaginary sphere onto which all the stars are viewed as being on for the purposes of locating them
The smallest structure that has the properties of an element. Atoms contain positively charged protons and uncharged neutrons in the nucleus. Negatively charged electrons orbit around the nucleus.