Chemistry Crossword

3. change of state from solid to a gas
4. positively charged centre of an atom; contains protons and neutrons
6. chemical reaction that absorbs energy
7. property that describes the physical appearance and composition of a substance
9. refers to three common states in which matter can exist: solid, liquid, and gas
10. dull,brittle element that does not conduct electricity
11. cloudy mixture in which tiny particles of one substance are held within one another, and the particles can be separated out
12. positively charged particle in the nucleus of an atom
14. a table in which the elements are organized by their physical and chemical properties
16. group 17 elements in the periodic table; the most reactive non-metals
17. change of state from a solid to a liquid
18. substance that helps a chemical reaction to proceed more quickly
19. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
20. a system of easy-to-see warning symbols on hazardous materials
21. group 1 element in the periodic table, not including hydrogen; most reactive of the metals
25. element that has both metallic and non-metallic properties

1. characteristic that describes a particular substance
2. pure substance formed when at least one metal and one non-metal combine
5. homogeneous mixture; mixture of two or more pure substances that looks like one substance
8. combination of symbols that represent a compound
13. characteristics that can be used to describe a substance
15. an experiment in which one or more products of chemical reaction can escape
22. the smallest part of an element that is representative of the element
23. is anything that has mass and occupies space
24. fourth state of matter