Across
- 2. positively charged particle in the nucleus of an atom
- 4. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
- 5. a chemical combination of two or more elements
- 7. an experiment in which one or more products of chemical reaction can escape
- 8. substance that helps a chemical reaction to be faster
- 10. a table in which the elements are organized by their physical and chemical properties
- 11. group 1 elements in the periodic table
- 13. chemical reaction that absorbs energy
- 15. the most reactive non-metal
- 16. substance made of only one kind of matter
- 21. neutral particle in the nucleus of an atom
- 23. a cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance
- 24. compound that dissolves in water to form a soluion
Down
- 1. mass of one atom of an element calculated from the number of protons, neutrons and electrons
- 3. element that has both metallic and non-metallic properties
- 6. pure substance formed when non-metals combine
- 8. slow chemical change that occurs when oxygen in the air reacts with metal
- 9. catalyst involved in chemical reactions in living things
- 12. a system easy to see warning symbols on hazardous materials
- 14. change of state from gas to solid
- 17. chemical reaction that releases energy
- 18. mass of a substance that can dissolve in a given amount of solvent to form a saturated solution at a given temperature
- 19. the most stable and unreactive elements
- 20. horizontal row of elements in the periodic table
- 22. atom that has become electrically charged because it has lost or gained electrons