Across
- 1. a system of easy-to-see warning symbols on hazardous materials
- 6. the ability of a substance to conduct electricity or heat
- 8. change in the appearance or state of a substance that does not change the composition
- 9. a reaction that takes place when two or more substances react to form new substances
- 11. mass of one atom of an element calculated from the total number of protons, neutrons, electrons of that atom
- 12. characteristics that describe a particular substance (e.g. colour, lustre, melting point)
- 13. combination of symbols that represent a compound
- 15. group 1 elements in the periodic table, not including hydrogen
- 16. anything that has mass and occupies space
- 18. horizontal row of elements in the periodic table
- 19. pure substance formed when at least one metal and one non-metal combine
- 23. positively charged centre of an atom; contains protons and neutrons
Down
- 2. group 17 elements in the periodic table
- 3. a table in which the elements are organized by their physical and chemical properties
- 4. netrual particle in the nucleus of an atom
- 5. measure of one atomic mass
- 7. pure substance formed when non-metals combine
- 8. made of only one kind of matter
- 10. occurs when two or more materials react and create new materials
- 12. group of atoms acting as one
- 14. group of atoms joined by covalent bonds
- 17. vertical column of elements in the periodic table
- 20. a chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
- 21. positively charged particle in the nucleus of an atom
- 22. amount of mass in a given volume of a substance