Elemental Puzzles

2. A compound formed when hydrogen combines with oxygen
6. A substance that starts a chemical reaction
7. A substance that donates protons in a chemical reaction
12. Displacement: A type of reaction where one element replaces another in a compound
13. The process of combining elements to form compounds
15. A substance that accepts protons in a chemical reaction
17. The substance formed as a result of a chemical reaction
19. A reaction that involves the breaking of bonds and formation of new bonds
20. The gas that makes up 21% of the Earth's atmosphere
21. A metal with the symbol Fe, essential for blood production
22. The type of reaction that involves the rearrangement of atoms
23. The pH level of a neutral solution
24. A reaction that occurs spontaneously without external energy

1. The type of reaction where two or more substances combine to form one product
3. The lightest element on the periodic table with the symbol H
4. A reaction that can occur with oxygen and produces heat and light
5. The element with the atomic number 6, a key component of organic molecules
8. Displacement: A reaction where two compounds exchange components to form new compounds
9. The process of breaking down a compound into simpler substances
10. The process of a solid forming from a solution during a chemical reaction
11. Energy: The energy required to start a chemical reaction
14. The element with the chemical symbol Cl, often used in disinfectants
16. A reaction that occurs in an aqueous solution
18. The number before a compound in a chemical equation to balance it
23. The element with the atomic number 11, commonly found in table salt