Chemistry

4. negatively charged particles located in the nucleus of an atom
6. a fundamental property of electrons that describe their intrinsic angular momentum
7. the smallest amount of energy that can be emitted or absorbed as electromagnetic radiation
8. the part of the universe being studied in a chemical reaction
12. atoms of the same element that has different numbers of neutrons
14. a principal stating that energy cannot be created nor destroyed, only transformed
15. a measure of how hot or cold something is
20. the smallest unit of a chemical element
22. a measure of how well a material conducts heat
24. a pure substance consisting of only one type of atom
25. positively charged subatomic particles located in the nucleus of an atom

1. a form of energy that can be transferred between objects
2. the total number of protons and neutrons in an atoms nucleus
3. a fundamental constant used to describe the sizes of quanta in quantum mechanics
5. a tabular arrangement of the chemical elements, organized by atomic number
9. the process of a substance changing from one state to another
10. the minimum energy needed for a reaction to occur
11. transfer the movement of heat from one object or substance to another
13. the total heat content of a system
16. a measure of the disorder or randomness in a system
17. the energy of moving particles in a substance related to temperature
18. the study of how heat is involved in chemical reactions
19. the number of waves that pass a given point per unit of time
21. a region in an atom where there is a high probability of finding electrons
23. a unit of energy used to measure heat