Chemistry Crossword

3. Invisible negatively charged particle that orbits the nucleus of an atom.
6. Pure substance that cannot be broken down into other substances.
9. Anything that has mass and occupies space.
11. Description of how a substance interacts with other substances, such as acids.
12. An experiment in which one or more products of a chemical reaction can escape.
14. Pure substance formed when non-metals combine.
17. Orbit of electrons around the nucleus of an atom.
18. Group of atoms joined by covalent bonds.
19. Substance that helps a chemical reaction to proceed more quickly.
21. Number of protons in the nucleus of one atom of an element.
22. Catalyst involved in chemical reactions in living things.
23. Cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance.
24. Atom that has become electrically charged because it has lost or gained electrons.
25. Neutral particle in the nucleus of an atom.

1. Pure substance formed when at least one metal and one non-metal combine.
2. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy.
4. Element that can be between a metal and a non-metal.
5. An experiment in which all reactants and all products of a chemical reaction do not escape.
7. Positively charged center of an atom that contains neutrons and protons.
8. Mixture in which the different substances that make up the mixture are visible.
10. A neutral particle made up of a nucleus containing protons and neutrons.
13. Slow chemical change that occurs when oxygen in the air reacts with a metal.
15. Mass of one atom of an element.
16. A reaction that takes place when two or more substances react to form new substances.
20. Vertical columns of elements in the periodic table.