Across
- 1. positively charged centre of an atom; contains protons and neutrons
- 4. the smallest part of an element that is representative of the element
- 6. group 1 element in the periodic table, not including hydrogen; most reactive of the metals
- 7. a system of easy-to-see warning symbols on hazardous materials
- 11. group 17 elements in the periodic table; the most reactive non-metals
- 12. characteristics that can be used to describe a substance
- 13. homogeneous mixture; mixture of two or more pure substances that looks like one substance
- 15. substance that helps a chemical reaction to proceed more quickly
- 16. combination of symbols that represent a compound
- 18. dull,brittle element that does not conduct electricity
- 20. characteristic that describes a particular substance
- 22. chemical reaction that absorbs energy
- 24. refers to three common states in which matter can exist: solid, liquid, and gas
- 25. is anything that has mass and occupies space
Down
- 2. change of state from solid to a gas
- 3. element that has both metallic and non-metallic properties
- 5. a table in which the elements are organized by their physical and chemical properties
- 8. cloudy mixture in which tiny particles of one substance are held within one another, and the particles can be separated out
- 9. pure substance formed when at least one metal and one non-metal combine
- 10. property that describes the physical appearance and composition of a substance
- 14. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
- 17. change of state from a solid to a liquid
- 19. an experiment in which one or more products of chemical reaction can escape
- 21. positively charged particle in the nucleus of an atom
- 23. fourth state of matter