All ACT words for 6-2
O1- Atom: The smallest part of an element that is recognizable as that element
O2-Acid: compound with a pH less than 7
O3-Base: compound with a pH greater than 7 (synonym:alkali)
O4-CalorieA quantity of heat energy; the amount needed to raise the temperature of one gram of water 1° C
O5-Cell: The lowest-level structure of any living organism that can perform all the functions of life, including reproduction
O6-Carnivore: Meat-eater
O7-Condensation: The process whereby a decrease in energy causes vapor particles to return to a liquid phase
O8-Chlorophyll: the main pigment in plants that captures light energy during photosynthesis
O9-Compound: a substance composed of two or more chemically bonded elements
O10-Conductor: a material that allows heat or electricity to flow through it with minimal resistance
O11-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
O12-Control variable: a variable that stays constant in an experiment, allowing the effect of another variable to be measured
O13-DensityIn a physics sense, the amount of mass per unit volume; in a more general sense, the quantity per unit area or volume
O14-DNA: Nucleic acid in the cells of an organism; contains the genes of an organism and transmits these to future generations
O15-Ecological succession: a sequence of changes in the plant or animal life of a region or habitat
O16-Electron: a negatively charged part of the atom
O17-Element:A substance consisting of exactly one type of atom
O18-Erosion: wearing away, typically by running water or wind
O19-Evaporation: the changing of liquid into gas
O20-Fossil: The preserved remains of a very old organism
O21-Habitat: the area of the ecosystem where a plant or animal naturally lives
O22-Herbivore: an animal that eats only plants
O23-Hypothesis: A statement that is a proposed explanation of a scientific phenomenon or event ( Testable)
O24-Insulator: a substance that blocks the flow of heat or electricity
O25-Kinetic energy: the energy of an object in motion
O26-Molecule: The smallest unit of a chemical compound
O27-Parasite: an organism that invades another organism and feed off that organism (host)
O28-Photosynthesis: the process in which plants use the sun's energy to convert carbon dioxide and water into glucose
O29-Symbiosis: A close relationship between two organisms that is mutually exclusive
O30-AtmosphereThe layer of air surrounding Earth