Across
- 1. something that helps speed up the chemical reaction
- 2. positively charged centre of an atom
- 3. a chemical reaction in which heat is abosorbed
- 5. able to form the object to something else without breaking it
- 6. a compound made from a metal and non-metal elements
- 9. a change where a new substance is made
- 11. the most reactive element
- 13. a compound made with 2 non-metal elements
- 16. an experiment in which is one or more products of a chemical reaction can escape
- 18. how well the element or compound is able to conduct electricity
- 21. a group of atoms joined by covalent bonds
- 22. a group of elements that are the most reactive non-metals
- 23. hydogen's symbol
- 24. a combination of pure chemicals
Down
- 1. this is a principle saying that matter cannot be gained or lost in a chemical reaction
- 4. a chemical reaction that releases heat
- 7. chemical combination of 2 ore more elements in a specific ratio
- 8. the metals found in group 1
- 10. an element that has the bot metallic and non-metallic properties
- 12. number the sum of the number of protons and neutrons in an atom
- 14. a change in the appearance.
- 15. water's chemical formula
- 17. a group of non-metal elements that are the most stable
- 19. substance that has a strong resistance to the flow of electricity
- 20. neutral particle in the nucleus of an atom