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Across 2. This element is used to make bright, attractive lights 6. This material is often refined into quartz, and then further refined down into microchips used in electronics and computing 10. Located to the LEFT of the arrow in a chemical equation. These are your original substances that react together to form a new product. 12. A substance that increases the rate of change in a chemical reaction 13. _______ Energy is the name given to energy associated with breaking and forming new chemical bonds 15. When iron rusts, it leaves behind physical proof that a __________ _________ took place. 16. The major holiday that occurs this month 19. An ________________ reaction releases energy and typically results in an increase in temperature. 20. An ________________ reaction absorbs energy.

Down 1. What is the lightest noble gas? 3. A ______________ reaction combines simpler reactants to form an entirely new compund 4. Located to the RIGHT of the arrow in a chemical equation. It is formed when reactants combine together to form a new substance. 5. The element that diamonds are made of 7. The Law of the Conservation of Mass states that matter cannot be created or ___________ in a chemical reaction. 8. When methane is burned, it is an example of a _______________ reaction 9. The chemical process in which plants absorb energy from the sun in order to turn carbon dioxide and water into oxygen and glucose 11. This is formed when two liquids interact and form a SOLID substance as a result 14. Most living things obtain energy through this process that is very similar to a combustion reaction 15. Indicates how many molecules take part in a reaction. 17. Christmas is on a ________________ this year. (What day?) 18. This element gives off the smell of rotten eggs