ACT Words Updated for Intro to Science and Physical Science Test!
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ACT Words Updated for Intro to science and physical science test!
O Absolute zero: lowest-possible temperature, approximately -273
degrees C or 0 degrees K (elvin)
O Alloy: a substance composed of two or more metals
(synonym: amalgam)
O Barometer: an instrument used to measure atmospheric pressure
O Boiling point: the temperature at which additional thermal energy
causes a substance to change from liquid to vapor
O Concentration: The exact amount of substance dissolved in a given
amount of solvent; refers to a solution
O Catalyst: a substance that speeds up a chemical reaction without being
changed by the reaction
O Diffusion: The scattering of light; the spreading of a liquid or gas from
areas of higher concentration to areas of lower concentration
O Infrared radiation: electromagnetic waves whose wavelength is longer
than that of visible light
O Ion: a molecule or atom that has become charged by either gaining or
losing an electron
O Isotope: a type of element with the same number of protons per atom
but different number of neutrons O Melting point: the temperature at which a substance changes from
solid to liquid state
O Neutron: an atomic particle that has no charge
O Osmosis: the movement of liquid through a membrane
O PH: a scale from 1-14; represents the acidity or alkalinity of a
solution; low values are acidic, 7 is neutral, high values is alkaline
O Proton: a positively charged atomic particle
O Ultraviolet radiation: electromagnetic waves with wavelength shorter
than that of visible light
O Vapor: the gaseous for of liquid
O X ray: Electromagnetic radiation with wavelength shorter than
ultraviolet radiation
O Frequency: The number of cycles per unit time of a repeating
phenomenon
O -Insulator: a substance that blocks the flow of heat or electricity Required words for all students are below…
O 1- Atom: The smallest part of an element that is recognizable as that
element
O 2-Acid : compound with a pH less than 7
O 3-Base: compound with a pH greater than 7 (synonym: alkali)
O 7-Condensation: The process whereby a decrease in energy causes
vapor particles to return to a liquid phase
O 9-Compound: a substance composed of two or more chemically
bonded elements
O 10-Conductor: a material that allows heat or electricity to flow
through it with minimal resistance
O 11-Control Group: a sample or group in which no variables are tested. The control serves as a basis for comparison to the tested group. Example: 1. Testing how watering affects plants- test group gets different amounts of water. The Control group will not get water.- Scientists will compare the control group to the group that was tested ( got water in this case) EX: same height for egg drop O 12-Control variable : a variable that stays constant in an experiment,
allowing the effect of another variable to be measured
O 13-Density In a physics sense, the amount of mass per unit volume; in
a more general sense, the quantity per unit area or volume
O 16-Electron: a negatively charged part of the atom
O 17-Element:A substance consisting of exactly one type of atom
O 19-Evaporation: the changing of liquid into gas
O 23-Hypothesis: A statement that is a proposed explanation of a scientific phenomenon or event ( Testable) O 24-Insulator: a substance that blocks the flow of heat or electricity
O 25-Kinetic energy: the energy of an object in motion
O 26-Molecule: The smallest unit of a chemical compound