Across
- 1. where the physical properties of matter change
- 3. process of rotting; decay
- 5. cations and anions of two compounds switch places to form to new products
- 10. A reaction requiring the absorption of heat
- 12. a table in which the chemical elements are arranged in order of increasing atomic number
- 15. bond formed when two atoms share a pair of electrons
- 16. an expression
- 17. substance made from another substance through chemical change
- 19. the tendency of a substance to undergo a chemical reaction
- 20. combination of ideas to form a theory
- 23. natural materials that do not produce heat or electricity
- 24. one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table
Down
- 2. irreversible chemical reaction involving the rearrangement of the atoms
- 4. the process of burning something
- 6. particle with a negative charge
- 7. measure of the quantity of some physical property
- 8. particle with a positive charge
- 9. a substance with high electrical conductivity
- 11. bond formed when one atom completely transfers one or more electrons to another atom
- 13. a chemical reaction that releases heat
- 14. atom or molecule with a net electrical charge
- 18. particle having no charge
- 21. chemical reaction where one element replaces another in a compound
- 22. substance that is present at the start of a chemical reaction