chemistry crossword

3. They are used to describe matter, like colour or conductivity
5. Substance that reacts with another substance in a chemical reaction to create new substances with different propeties
7. A table in which elements are organized by their physical and chemical properties
10. Number of protons in the nucleus of one atom of an element
13. States that mass cannot be created or destroyed
16. Chemical reaction that absorbs energy
17. Pure substance formed when at least one metal and one non-metal combine
18. A positively charged particle
20. Slow chemical change that occurs when oxygen in the air reacts with a metal
21. Occurs when a material changes from one state o another
23. Matter which has a specific composition and specific properties / every pure element
24. Horizontal row of elements in the periodic table

1. Chemical reaction that releases energy
2. Vertical column of elements in the periodic table
4. Pure substance formed when non-metals combine
6. New substance produced in a chemical reaction between reactants
8. Mass of one atom of an element
9. Pure substance that cannot be broken down into other substances
11. Anything that has mass and takes up space
12. The most reactive non-metals
14. Occurs when two or more materials react and create new materials
15. Elements that have both metallic and non-metallic properties
19. A system of easy-to-use warning symbols on hazardous materials
22. Chemical reaction that occurs when oxygen reacts with a substance to form a new energy and give off energy