Across
- 2. cloudy mixture in which tiny particles of one substance are held within another
- 4. substances that strongly resist the flow of electricity
- 5. the smallest part of an element that is representative of that element
- 7. invisible negatively charged particle that orbits the nucleus of an atom
- 10. element that has both metallic and non-metallic properties
- 11. mixture in which the different substances that make up the mixture are visible
- 16. slow chemical change that occurs when oxygen in the air reacts with a metal
- 17. in the appearance or state of a substance
- 19. the most stable and unreactive elements
- 21. a table in which the elements are organized by their physical and chemical properties
- 22. an experiment in which one or more products of a chemical reaction can escape
- 23. chemical reaction that releases energy
- 25. substances that helps a chemical reaction to proceed more quickly.
Down
- 1. positively charged centre of an atom contains protons and neutrons
- 2. an experiment in which all reactants and all products of a chemical reaction are accounted for
- 3. pure substances formed when at least one metal and one non metal
- 6. pure substance formed when non metals combine
- 8. substance made only of one kind of matter
- 9. dull,brittle element that does not conduct electricity
- 12. change that results when two or more substances react to create a different substance or substances
- 13. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
- 14. atom that has become electrically charged because it has lost or gained electrons
- 15. chemical reaction that absorbs energy
- 18. pure substance that cannot be broken down into other substances
- 20. mass of one atom of an element calculated from the total number of protons
- 24. the most reactive non-metals