Chapter 2: Matter

3. A state of matter with no definite shape or volume.
5. substance made of two or more elements chemically combined in fixed proportions.
8. A material with a consistent composition and distinct chemical properties.
11. A mixture with a non-uniform composition.
12. A state of matter with a definite volume but no definite shape.
13. A group of atoms bonded together, representing the smallest unit of a compound.
14. A characteristic that can be observed without changing the substance's identity.
16. A change where a substance transforms into a different substance.
18. A mixture of metals, or a metal combined with one or more other elements.

1. A change that affects the form of a substance but not its chemical composition.
2. The smallest unit of an element, consisting of protons, neutrons, and electrons.
4. A mixture with a uniform composition throughout.
6. A combination of two or more substances where each retains its properties.
7. Anything that has mass and takes up space.
9. A characteristic that describes a substance's ability to change into different substances.
10. A state of matter with a definite shape and volume.
15. A pure substance consisting of only one type of atom.
17. A homogeneous mixture where one substance (solute) is dissolved in another (solvent).