chemistry crossword

3. Vertical column of elements in the periodic table
4. They are used to describe matter, like colour or conductivity
5. Slow chemical change that occurs when oxygen in the air reacts with a metal
6. New substance produced in a chemical reaction between reactants
9. Anything that has mass and takes up space
12. Matter which has a specific composition and specific properties / every pure element
13. States that mass cannot be created or destroyed
20. Horizontal row of elements in the periodic table
21. Pure substance formed when at least one metal and one non-metal combine
23. Chemical reaction that releases energy

1. The most reactive non-metals
2. Pure substance that cannot be broken down into other substances
4. Occurs when a material changes from one state o another
6. A table in which elements are organized by their physical and chemical properties
7. Pure substance formed when non-metals combine
8. Elements that have both metallic and non-metallic properties
10. Number of protons in the nucleus of one atom of an element
11. A system of easy-to-use warning symbols on hazardous materials
14. Occurs when two or more materials react and create new materials
15. Substance that reacts with another substance in a chemical reaction to create new substances with different propeties
16. Mass of one atom of an element
17. Chemical reaction that occurs when oxygen reacts with a substance to form a new energy and give off energy
18. an atom with a neutral charge is one where the number of electrons is equal to the atomic number
19. Chemical reaction that absorbs energy
22. A positively charged particle