Env Science 3.1-3.2 Vocab

2. Minute compartments surrounded by semipermeable membranes within which the processes of life are carried out by all living organisms.
5. A signal or factor that tends to increase a process or component.
8. A signal or factor that tends to decrease a process or component.
11. Systems that exchange energy and matter with its environment.
13. The flow of energy and/or matter into and out of a system.
14. The long, double-helix molecule in the nucleus of cells that contains the genetic code and directs the development and functioning of all cells.
16. Forms of a single element that differ in atomic mass due to a different number of neutrons in the nucleus.
17. Substances composed of different kinds of atoms.
18. Substances that cannot be broken into simpler units by chemical means.
19. The smallest particles that exhibit the characteristics of an element.

1. In any chemical reaction, matter changes form; it is neither created nor destroyed.
3. Systems in which there is no exchange of energy or matter with its surroundings.
4. a combination of two or more atoms.
6. Network of interdependent components and processes.
7. The characteristic number of protons per atom of an element.
9. Complex molecules organized around skeletons of carbon atoms arranged in rings or chains; includes biomolecules, molecules synthesized by living organisms.
10. A value that indicates the acidity or alkalinity of a solution on a scale of 0 to 14, based on the proportion of H+ ions present.
12. Anything that takes up space and has mass.
15. A system in stable balance.