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Across 1. THE SMALLES PARTICLE OF AN ELEMENT 4. RESISTANCE OF A FLUID TO FLOW 6. THE ABILITY OF A SUBSTANCE TO COMBINE CHEMICALLY WITH ANOTHER SUBSTANCE 9. TEMPERATURE AT WHICH A SOLID BECOMES A LIQUID 11. THE STUDY OF MATTER AND HOW IT CHANGES 13. THE SYMBOLS AND NUMBERS OF INDICATING THE ATOMS CONTAINED IN THAT SUBSTANCE 14. CHARACTERISTIC OF A SUBSTANCE THAT CAN BE OBSERVED OR MEASURED WITHOUT CHANGING THE COMPOSITION 16. A COMBINATION OF MORE THAN ONE PURE SUBSTANCE NOT CHEMICALLY COMBINED 18. CHANGE FROM GAS TO LIQUID 20. A SUBSTANCE THAT CANNOT BE BROKEN DOWN INTO SIMPLER SUBSTANCES 22. MATTER THAT HAS A FIXED COMPOSITION AND DEFINITE PROPERTIES 23. ABILITY TO CHANGE OR MOVE MATTER

Down 2. THE SMALLEST UNIT OF A SUBSTANCE THAT HAS ALL OF THE PROPERTIES OF THAT SUBSTANCE 3. THE FORCE THAT A DENSE FLUID PUSHES A LESS DENSE SUBSTANCE UPWARD; THE ABILITY TO FLOAT 5. CHANGE FROM SOLID TO A GAS 7. THE WAY A SUBSTANCE REACTS WITH OTHERS TO FORM NEW SUBSTANCES WITH DIFFERENT PROPERTIES 8. TEMPERATURE AT WHICH A LIQUID BECOMES A GAS FRO 10. CHANGE FROM LIQUID TO A GAS 11. A CHANGE WHEN A SUBSTANCE CHANGES COMPOSITION BY FORMING NEW SUBSTANCES 12. A CHANGE IN THE PHYSICAL FORM OR PROPERTIES OF A SUBSTANCE WITHOUT CHANGING COMPOSITION 15. FORCE EXERTED ON AN OBJECT, SUBSTANCE, OR SURFACE 17. A SUBSTANCE MADE OF ATOMS OF MORE THAN ONE ELEMENT CHEMICALLY BONDED TOGETHER 19. MASS PER UNIT VOLUME OF A SUBSTANCE; M/V 21. ANYTHING THAT HAS MASS AND OCCUPIES SPACE