Chemistry

5. Substances made up of only one type of atom or molecule
10. The amount of matter in an object
11. A theory that explains the behavior of matter in terms of the motion of its particles
16. Properties that can be measured (e.g., mass, volume, temperature)
17. The smallest unit of an element that maintains the properties of that element
21. Changes that alter the chemical composition of a substance
23. The process of a substance changing directly from a solid to a gas
24. A well-tested explanation for a set of observations or phenomena
27. A negatively charged subatomic particle
28. Properties that describe how a substance reacts with other substances
29. A pure substance made up of two or more different types of atoms chemically combined
30. The central part of an atom, containing protons and neutrons
31. particle A particle smaller than an atom (e.g., electron, proton, neutron)

1. Properties that describe the quality of a substance (e.g., color, odor, texture)
2. Changes that alter the form of a substance but not its chemical composition
3. The principle that mass cannot be created or destroyed in a chemical reaction
4. A state of matter with no definite shape or volume
5. Properties that can be observed or measured without changing the substance’s chemical identity
6. A pure substance made up of only one type of atom
7. The process of a liquid changing to a gas
8. The amount of mass in a given volume of a substance
9. The amount of space an object occupies
12. The process of a gas changing to a liquid
13. A positively charged subatomic particle
14. A state of matter with a definite shape and volume
15. Substances that undergo a chemical change
18. The process of a substance changing directly from a gas to a solid
19. Anything that has mass and takes up space
20. A simplified representation of a real-world system
22. A state of matter with a definite volume but no definite shape
25. A neutral subatomic particle
26. Substances formed as a result of a chemical reaction