Physical and Chemical Changes

5. A substance formed (often seen as bubbles or fizzing) without boiling, indicating a chemical change."
6. Property A characteristic that describes how a substance reacts with other substances. (e.g., flammability, ability to rust)"
7. Change A change that results in the formation of one or more new substances with different properties; also called a chemical reaction. (e.g., burning wood, rusting)"
10. Groups of atoms bonded together; in a chemical change, these break apart and rearrange to form new ones."
11. The original substance(s) at the beginning of a chemical reaction.
13. A slow chemical change where iron reacts with oxygen and moisture to form iron oxide (a new substance).
15. Property A characteristic of a substance that can be observed or measured without changing the substance's identity. (e.g., color, density, melting point)"

1. An unexpected change (either getting hotter or colder) during a reaction is evidence of a chemical change.
2. Change A change that alters the form, size, or state of a substance without changing its chemical identity. (e.g., cutting paper, melting ice)"
3. The process where one substance breaks down evenly into another, making a solution; a physical change."
4. The ability of a substance to burn or ignite, causing fire or combustion. (A chemical property)"
6. Change A permanent or unexpected shift in the appearance of a substance, which may indicate a chemical change."
8. The production of a new or different smell is one clue that a chemical change has occurred.
9. A change that can be easily undone or changed back to the original substance. (Most physical changes are this)
12. A change that cannot be easily undone; a new substance has usually been formed. (Most chemical changes are this)
14. of Matter The form matter takes, such as solid, liquid, or gas. A change between these is a physical change."
15. The new substance(s) formed at the end of a chemical reaction.