Chemistry Crossword

3. group of atoms joined by covalent bonds
5. catalyst involved in chemical reactions in living things.
8. group 17 elements in the periodic table; the most reactive non-metals.
9. homogeneous mixture of two or more substances that look like one substance.
10. cloudy mixture in which tiny particles of one substance are held within another, and the particles can be separated out.
13. combination of pure substances, the components do not combine chemically and are not always in the same ratio.
16. number of protons in the nucleus of one atom of an element
17. positively charged center of atom; contains protons and neutrons.
19. an experiment in which one or more products of a chemical reaction can escape.
22. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy.
23. vertical column of elements in the periodic table; elements in the periodic table, elements in a family all have similar chemical properties.
24. positively charged particle in the nucleus of an atom

1. Chemical combination of two or more elements in a specific ratio.
2. invisible negatively charged particle that orbits the nucleus of an atom
4. substance that reacts with another substance(s) in a chemical reaction to create new substances with different properties.
6. change of state from solid to gas or from gas to solid.
7. cloudy mixture in which tiny particles of one substance are held within another, and the particles cannot be separated out.
11. characteristics that describe a particular substance
12. change of state from gas to a solid
14. change of state from a gas to liquid.
15. new substance produced in a chemical reaction between reactants
18. atom that has become electrically charged because it has lost or gained electrons.
20. Pure substance that cannot be broken down into other substances.
21. element that has both metallic and nonmetallic properties.
22. substance that helps a chemical reaction to proceed more quickly.