Across
- 4. type of chemical in which two or more simple substances combine to form a more complex substance.
- 11. a chemical change that results in the rearrangement of atoms forming products with new properties.
- 14. a chemical reaction accompanied by the absorption of heat.
- 16. a rule stating that atoms lose, gain, or share electrons in order to have 8 valence electrons.
- 19. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- 20. acronym of International Union of Pure and Applied Chemistry. An organization that establishes official names of chemical elements and compounds.
- 22. a substance that is the result of a chemical change and is written on the right side of the arrow in a chemical equation.
- 23. a positively charged ion due to the loss of 1 or more electrons.
- 25. type of covalent bond in which the electrons are not being shared equally. This results in one end of the molecule having a slightly negative charge and the other a slightly positive charge.
- 26. type of covalent bond in which the electrons are being shared equally.
- 28. a way to describe what goes on in a chemical reaction, the actual change in a material.
Down
- 1. a law stating that matter is neither created nor destroyed. In a chemical reaction, the same number of atoms occurs in the products as in the original reactants.
- 2. type of chemical reaction in which a compound and oxygen is combined to produce heat and new product.
- 3. a type of chemical reaction in which a single uncombined element replaces another in a compound.
- 5. a covalently bonded group of atoms that usually forms ionic bonds with other atoms.
- 6. a chemical reaction that releases energy in the form of light or heat.
- 7. a type of chemical reaction in which a more complex substance breaks down into its more simple parts.
- 8. numerical charge of an ion that indicates the number of electrons lost, gained, or shared.
- 9. an electrically charged atom due to losing or gaining 1 or more electrons.
- 10. an electron located in the outermost shell (valence shell) of the atom, that can be transferred to or shared with another atom.
- 12. a substance that undergoes a chemical change and is written on the left side of the arrow in a chemical equation.
- 13. a region that forms when valence electrons from different atoms interact with each other.
- 15. bond formed by the sharing of electrons. Occurs between two nonmetals.
- 17. written above the line to indicate the charge (oxidation number) of the ion.
- 18. the number placed in front of molecules in a chemical equation that represent the number of molecules.
- 20. bond formed by the transferring of electrons. Occurs between a metal (loses electrons) and a nonmetal (gains electrons).
- 21. written below the line to indicate the number of atoms.
- 24. a word added in the front of another word. Prefixes are used in naming covalent compounds.
- 27. a negatively charged ion due to gaining 1 or more electrons.