Chemistry Crossword

1. horizontal row of elements in the periodic table
5. the mass of one atom of an element
6. chemical combination of two or more elements in a specific ratio
9. change in the appearance or state of a substance that does not change composition
10. substance that helps a chemical reaction proceed more quickly
11. atom that has become electrically charged
13. homogeneous mixture; mixture of two or more pure substances that looks like one substance.
14. combination of symbols that represent a compound
16. pure substance that cannot be broken down into other substances
17. mass of a substance that can dissolve in a given amount of solvent to form a saturated solution at a given temperature
19. group 18 elements in the periodic table;the most stable and unreactive elements
20. the sum of the number of protons and neutrons in an atom
23. neutral particle in the nucleus of an atom
24. positively charged centre of an atom

1. cause(a substance) to be deposited in solid form from a solution.
2. an experiment in which one or more products of a chemical reaction can escape
3. positively charged particle in the nucleus of an atom
4. number of protons in a single nucleus of an element
7. a table in which elements are organized by their physical and chemical properties
8. property that describes the physical appearance and composition of a substance
12. workplace,hazardous,materials,information,system
15. A.M.U
18. the most reactive non-metals
21. element that has both metallic and non-metallic properties
22. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties