Puzzle Chemical Reactions

2. chemical reaction that absorbs heat
4. change that occurs when one or more substances change into new substances with new chemical properties
6. starting substance that is part of a chemical reaction
7. vertical columns of elements on the periodic table
9. chemical reaction that releases heat
11. letters and numbers showing the types and number of atoms that repeat to make up a substance
13. able to cause damage
16. tiny piece that all matter is made of; basic unit of matter; element
17. the combining of atoms to form molecules
19. pure substance that cannot be separated or broken down into simpler substances; made of atoms
23. characteristic of matter that describes a substance's ability to participate in chemical reactions
24. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see

1. process in which atoms rearrange to form new substances
3. to change the order or position of something
5. element that has properties of both metals and nonmetals; known as semiconductors
8. ending substance that is made during a chemical reaction
10. chart of the elements showing the repeating pattern of their
12. pure substance made of atoms of two or more elements joined by chemical bonds
14. structure formed by repeating groups of atoms linked together in a large network
15. the energy that an object has because it is moving
18. an interaction that holds atoms or ions together
20. element that is dull, brittle, and poorly conducts heat and electricity
21. horizontal rows of elements on the periodic table
22. element that is shiny, ductile, malleable, and conducts heat and electricity well