Chemistry crossword

2. Pure substance formed when at least one metal and non-metal combine
4. Smallest part of an element that is representative of that element
5. Substance that greatly resists the flow of electricity
6. Substance that helps a chemical reaction to proceed quicker
7. Describes how a substance reacts with other other substances
9. Combination of symbols that represent a compound, it identifies the elements in a compound and the amount of each element
10. group of 17 elements in the periodic table. Most reactive non-metals
13. Describes the physical appearance and composition of a substance
16. A chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
17. Anything that has mass and takes up space
18. A material that is made up of one substance
19. Catalyst involved in a chemical reactions in living thing
20. An experiment in which one or more products of a chemical reaction can escape
22. Shiny, malleable, ductile, element that conducts electricity
23. Horizontal row of elements in the periodic table

1. A change that occurs when 2 or more substances react to create a new substance
3. Pure substance formed when two non-metals combine
4. The mass of one atom in an element, made up of protons, neutrons and electrons
8. A material that electric charge can move through easily
11. Chemical combination of two or more elements in a specific ratio
12. New substance produced in a chemical reaction between reactants
14. The number of protons in a nucleus of one atom in an element
15. Characteristics that can be used to describe a substance
21. Solid to gas