Across
- 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.
Down
- 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.