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Across 1. A device that measures mass 6. Reaction where a substance breaks down into 2 or more simpler substances 8. CaCl2 9. Minimum amount of energy required to start a chemical reaction 10. SI unit of measurement for mass 11. Piece of laboratory glassware 12. The smallest particle that has the properties of an element 13. This type of reaction involves oxygen and a fuel 16. Endothermic reaction 19. A device that measures temperature 21. A substance that is the result of a chemical change 24. The center of an atom; made up of protons and neutrons 25. Exothermic reaction

Down 2. The number of protons in the nucleus of an atom 3. NaHCO3 4. The reactant completely consumed by a chemical reaction 5. NH4NO3 7. A reaction that transfers heat to the reactants as heat from the surroundings 14. Reaction where two or more simple substances combine to form a more complex substance 15. SI unit of temperature 17. A reaction that transfers heat from the reactants to the surroundings as heat 18. Anything that has mass and takes up space 20. A substance that undergoes a chemical change 22. Replacement reaction where atoms of 1 element replace atoms of another element in a compound 23. Replacement reactions where atoms in 2 different compounds trade places with each other