Chemical Reactions

8. a reaction that releases energy, causing the new substance to get warmer
9. when you eat lunch and your food is digesting, this is a _____________ change
10. to change the order or position of something
11. a chemical reaction can happen with only a ___________ reactant, or many.
12. During a chemical reaction, ________ do not change from one type to another
14. a starting substance that is part of a chemical reaction
16. an ending substance that is made during a chemical reaction
17. during a chemical reaction, atoms cannot be created or ____________
18. the temperature at which a substance changes from the liquid phase to the gase phase
23. something that is mde of all the same atoms or groups of atoms
25. a reaction that takes in energy, causing the new substance to get cooler

1. different substances have different ______________
2. one or more starting substances (reactants) change into one or more different substances (_________)
3. a group of atoms joined together in a partiular way
4. things that are too small or too large to see can be studied with these
5. When _________ burn they release energy
6. something that can be observed about a substance, such as color, smell, or boiling point
7. a process in which atoms rearrange to form new substances
10. during a chemical reaction, all of the atoms that make up the ________________ rearrange to form the products.
13. groups of atoms _________ to make up a substance
15. tiny pieces that all matter is made of
19. when you sharpen a pencil, it is a _________ change
20. the temperature at which a substance changes from a solid phas to the liquid phase
21. Burning is a type of ___________ reaction.
22. during a chemical reaction, atoms ____________ be created or destroyed
24. atoms _________________ to form different groups of atoms(molecules) during a chemical reaction