Chemistry Crossword

2. Absorbs heat energy
4. The smallest part of an element that is representative of that element
5. The speed of chemical reaction
9. A pure substance formed when at least one metal and one non-metal combines
10. Total mass of reactants/Total mass of products
15. Occurs when oxygen in air reacts with a substance to form a new one and gives off heat
18. Releases heat energy
20. Ions with a positive charge
21. Neutral particles
22. A new substance produced between reactants
23. A group of atoms acting as one
24. A substance that reacts with another substance to create a new substance with different products/properties
25. Slow chemical change that occurs when in the air reacts with a metal

1. Makes place in the cells in your body
3. Anything on the periodic table that is only made up of one type of atom
6. Positively charged particles in the nucleus
7. One or more products can escape
8. All reactants and all products are accounted for
11. The average mass of an element in atomic mass units (amu)
12. A combination of symbols that represent a compound and the amount
13. A compound formed when two non-metals combine
14. An atom or a group of atoms that has become electrically charged because it has lost or gained electrons
16. Ions with a negative charge
17. Chemical combination of two or more elements in a specific ratio
19. The amount of proton it has