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