Chemistry Crossword

1. positively charged centre of an atom; contains protons and neutrons
4. the smallest part of an element that is representative of the element
6. group 1 element in the periodic table, not including hydrogen; most reactive of the metals
7. a system of easy-to-see warning symbols on hazardous materials
11. group 17 elements in the periodic table; the most reactive non-metals
12. characteristics that can be used to describe a substance
13. homogeneous mixture; mixture of two or more pure substances that looks like one substance
15. substance that helps a chemical reaction to proceed more quickly
16. combination of symbols that represent a compound
18. dull,brittle element that does not conduct electricity
20. characteristic that describes a particular substance
22. chemical reaction that absorbs energy
24. refers to three common states in which matter can exist: solid, liquid, and gas
25. is anything that has mass and occupies space

2. change of state from solid to a gas
3. element that has both metallic and non-metallic properties
5. a table in which the elements are organized by their physical and chemical properties
8. cloudy mixture in which tiny particles of one substance are held within one another, and the particles can be separated out
9. pure substance formed when at least one metal and one non-metal combine
10. property that describes the physical appearance and composition of a substance
14. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
17. change of state from a solid to a liquid
19. an experiment in which one or more products of chemical reaction can escape
21. positively charged particle in the nucleus of an atom
23. fourth state of matter