Chemistry crossword

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

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