Across
- 2. a substance made from two or more elements, chemically combined.
- 3. beginning substances that start a reaction.
- 6. is the study of the composition, structure, and properties of matter and the changes it undergoes.
- 8. substances that are formed during the reaction.
- 11. depends on the type of matter not the amount present.
- 13. is the smallest unit of an element that maintains the properties of that element.
- 14. is a pure substance made of only one kind of atom.
- 15. is always involved when physical and chemical changes occur.
Down
- 1. a process that absorbs energy from the suroundings.
- 4. a substance that is surrently a gas, but normally is a liquid or solid at room temperature.
- 5. a process that releases energy into the surroundings.
- 7. depends on the amount of matter in the sample.
- 9. is anything with mass that occupies space.
- 10. is a measure of the amount of matter.
- 12. is a measure of the amount of space that is occupied (a three dimensional value such as cm^3 or mL).