Across
- 2. pure substance that cannot be broken down into other substances contains one atom
- 4. substance that speeds up chemical reactions
- 6. Solid, liquid, gas and plasma
- 7. Change of stare from a solid to gas or a gas to a solid
- 8. Change in the appearance or state of a substance that does not change the composition
- 10. Measure of atomic mass
- 14. chemical reaction that produces heat
- 15. ability of a substance to conduct electricity or heat
- 16. a material that electricity or heat can move through easily
- 17. description of a solid that can be stretched into a long wire
- 18. positively charged center of an atom contains protons and nuetrons
- 19. A system of easy-to-use warning symbols for hazardous materials
- 21. chemical combination of two or more substances in a specific ratio
- 22. invisible negatively charged particle that orbits the nucleus of an atom
- 23. Change of state from a liquid to a solid
- 24. Catalyst involved in chemical reactions in living things
Down
- 1. slow chemical change that occurs when oxygen in the air reacts with metal
- 2. Change of state from a liquid to a gas
- 3. chemical reaction that absorbs heat
- 5. group 17 elements in the periodic table least reactive metals
- 9. number of protons in the nucleus equal to electrons
- 11. pure substance formed when at least one ,metal and nonmetal combine
- 12. Amount of mass in a given volume of a substance
- 13. Change of state from a gas to a liquid
- 20. Change of state from solid to a liquid