Across
- 6. the total kinetic energy of a substance's particles
- 7. the smallest unit of an element that maintains the properties of that element
- 9. a measure of the amount of matter in an object
- 11. a sample of matter, either a single element or a single compound, that has definite chemical and physical properties
- 12. the amount of space that an object takes up, or occupies
- 13. a group of atoms that are held together by chemical forces; a molecule is the smallest unit of a compound that keeps all the properties of that compound
- 17. the state of matter that has a definite volume but not a definite shape
- 18. a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
Down
- 1. the change of a substance from one physical state to another
- 2. a substance made up of atoms of two or more different elements joined by chemical bonds
- 3. the force holding atoms together in molecules or compounds, formed by interactions between their outer (valence) electrons to achieve a more stable, lower-energy state
- 4. a substance that cannot be separated or broken down into simpler substances by chemical means
- 5. the amount of force exerted per unit area of a surface
- 8. a measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object
- 10. a form of matter that does not have a definite volume or shape
- 14. the degree of compactness of a substance.
- 15. the state of matter in which the volume and shape of a substance are fixed
- 16. anything that has mass and takes up space