Chemistry Crossword

2. Group 17 elements in the periodic table; most reactive non-metals.
3. Combination on 2 elements.
8. Anything that has a mass and occupies space.
10. Slow chemical reaction when a metal combines with oxygen.
11. The Law that says the total mass of the products equals the mass of the reactants.
14. Pure substance formed when at least 1 metal and 1 non-metal combine.
15. Pure substance that can not be broken down into other substances; substance made up of only 1 type of atom
16. Catalyst involved in chemical reactions in living things.
17. Property that describes the appearance and composition of a substance.
21. An atom that has become electrically charged because of the loss or gain of an electron.
23. A system of easy-to-see warning symbols on hazardous materials
24. chemical reaction that releases heat energy.

1. Change in the appearance or state of a substance that does not change the composition.
4. An experiment in which all reactants and all products are accounted for.
5. Number of protons and in the nucleus of one atom of an element.
6. A table in which elements are organized by their physical and chemical properties.
7. Property that describes how a substance interacts with another substance.
8. Pure substance formed when non-metals combine.
9. Ability of a substance to conduct heat or electricity.
12. Chemical reaction that takes place in cell; food (sugar) reacts with oxygen to produce energy, water and carbon dioxide.
13. An experiment in which 1+ products of a chemical reaction can escape.
18. Change that results from 2+ substances to create a new substance; the new substance will have different properties from the original one.
19. chemical reaction that absorbs heat energy.
20. Mass of 1 element of an element calculated from the total number of protons, neutrons, and electrons of that atom.
22. Substance that helps a chemical reaction proceed more quickly.