Chemistry Crossword

2. Neutral particle in the nucleus of an atom.
4. Pure substance formed when at least one metal and one non-metal combine.
7. An experiment in which all reactants and all products of a chemical reaction do not escape.
8. An experiment in which one or more products of a chemical reaction can escape.
11. Cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance.
13. Element that can be between a metal and a non-metal.
15. Group of atoms joined by covalent bonds.
16. Mixture in which the different substances that make up the mixture are visible.
21. Catalyst involved in chemical reactions in living things.
22. Pure substance that cannot be broken down into other substances.
23. A reaction that takes place when two or more substances react to form new substances.

1. Chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy.
3. Vertical columns of elements in the periodic table.
5. Pure substance formed when non-metals combine.
6. A neutral particle made up of a nucleus containing protons and neutrons.
9. Orbit of electrons around the nucleus of an atom.
10. Slow chemical change that occurs when oxygen in the air reacts with a metal.
12. Description of how a substance interacts with other substances, such as acids.
14. Atom that has become electrically charged because it has lost or gained electrons.
17. Substance that helps a chemical reaction to proceed more quickly.
18. Mass of one atom of an element.
19. Number of protons in the nucleus of one atom of an element.
20. Invisible negatively charged particle that orbits the nucleus of an atom.
24. Anything that has mass and occupies space.
25. Positively charged center of an atom that contains neutrons and protons.