Across
- 3. smallest part of an element
- 6. chemical equation that does not have equal amounts of atoms of each type in both the reactants and products
- 7. a change in a substance that does not involve a change in its identity
- 9. ending materials in a chemical reaction
- 13. a pure substance with only one kind of atom
- 14. a starting material in a chemical reaction
- 16. substance formed by the chemical combination of 2 or more different elements in definite proportions
- 17. a combination of symbols and numbers to represent a substance
- 18. a representation of a chemical reaction using symbols to show the relationship between reactants and products
- 19. matter is not created or destroyed in any chemical or physical change
Down
- 1. a change in matter that produces one or more new substances
- 2. small number to the bottom-right of a chemical symbol that shows the number of atoms of that element
- 4. a group of atoms bonded together
- 5. a system in which matter can enter from or escape to its surroundings
- 8. number before an element or compound that shows how many of that element or compound there are
- 10. plants use the sun's energy to convert water and carbon dioxide into sugar and oxygen
- 11. makes, creates, produces; arrow in a chemical reaction
- 12. chemical equation with the same number of atoms of each element on both sides of the equation
- 15. a system in which no matter is allowed to enter or leave