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