ACT - Science Terms Practice Questions and Answers

ACT - Science Terms Practice Questions and Answers Acceleration - Correct Answer️️ -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 (m/s2 ). Acceleration due to gravity - Correct Answer️️ -The acceleration of an object that is only acted on by the force of the Earth's gravity. This value is given the symbol g and near the surface of the Earth it has a value of approximately 9.8 m/s2. The direction of the acceleration due to gravity is vertically downward. Accuracy - Correct Answer️️ -The closeness of an experimental measurement to the accepted or theoretical value. Acid - Correct Answer️️ -A substance that is a proton donor. The pH of an acid is less than 7. Analysis - Correct Answer️️ -A stage in the scientific method where patterns of observations are made. Aqueous solution - Correct Answer️️ -A solution in which the solvent is water. Arteries - Correct Answer️️ -The vascular tissue which carries blood away from the heart. Astronomy - Correct Answer️️ -The study of planets, stars, and space. Atom - Correct Answer️️ -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. ATP - Correct Answer️️ -(Adenosine Triphosphate)—A chemical that is considered to be the "fuel" or energy source for an organism. Atria - Correct Answer️️ -The chambers of the heart that receive blood. Base - Correct Answer️️ -A substance that is a proton acceptor. The pH of a base is greater than 7. Calibration - Correct Answer️️ -The examination of the performance of an instrument in an experiment whose outcomes are known, for the purpose of accounting for the inaccuracies inherent in the instrument in future experiments whose outcomes are not known. Capillaries - Correct Answer️️ -Vascular tissue that receives blood from the arterioles and releases the blood to the venuoles. Catalyst - Correct Answer️️ -An agent that changes the rate of a reaction, without itself being altered by the reaction. Celestial equator - Correct Answer️️ -The extension of the Earth's equator out onto the celestial sphere. Celestial poles - Correct Answer️️ -The extension of the Earth's north and south pole onto the celestial sphere. Celestial sphere - Correct Answer️️ -The imaginary sphere onto w