Chapter 2 Env. Sci. :Science, Matter, Energy & Systems

2. States that energy is not create or destroyed, it changes form
7. Heat energy
8. Combination of two or more elements held together
10. A process that alters/changes a one or more physical properties of a substance without changing the chemical properties
11. A educated guess at an outcome that is testable question to a problem
13. A physical or mathematical representation of a structure
17. Anything that has mass and takes up space
19. Study focused on discovering how nature works and using that knowledge to describe what happens in nature
21. A form of kinetic energy that travels in waves without a medium
25. A set of components that are working together in a usual way. Common components are inputs, throughputs and outputs of matter and energy
26. Atom with a positive or negative charge
27. Type of matter that cannot be broken down into a simpler substance by chemical processing

1. When a system is near collapse.
3. Results in lower-quality less useful energy
4. Process that occurs when an output of matter, energy, or information is fed back into the system as an input which leads to a change in the system
5. Combination of two or more of the same, or different, atoms held together through chemical bonds
6. States that matter is not created or destroyed, it changes form
9. Facts and information
12. The ability to do work
14. A process that alters the chemical properties of a substance to create something new
15. type of energy associated with being stored
16. Steps used by scientists to ask questions, gather data, and find solutions
18. A well tested and widely accepted description of observations that have been repeated many times in a variety of conditions
20. Type of energy associated with motion
22. In science this states what will happen in the natural world repeatedly; it does not explain why
23. The basic building block of matter
24. Atoms that have a different mass number because there is different number of neutrons in the nucleus.