Across
- 3. A pure substance made from two or more elements that are chemically combined
- 4. A measurement of the average speed of the particles within a substance
- 7. A change in a substance that does not change the identity of the substance
- 8. A substance that changes the rate of a chemical reaction but is not itself used up or affected by the reaction.
- 10. An organic compound comprised of the elements carbon, hydrogen, and oxygen; includes sugars, starch and cellulose
- 12. A class of organic compounds that serve as the building blocks for the information storage molecules DNA and RNA.
- 15. The tendency of energy to disperse
- 16. The building block of matter; the smallest possible particle of an element.
- 17. A pure substance made of only one kind of atom.
Down
- 1. An attraction between two atoms as a result of sharing or transferring valence electrons.
- 2. The substances formed during a chemical reaction, usually indicated on the right hand side of a chemical equation
- 3. A change in a substance that results in one or more new substances being formed that have different physical and chemical properties than those of the original substance.
- 5. The attraction of particles in one substance for particles in a different substance.
- 6. acid A class of organic compounds that serve as the building blocks of protein
- 9. A class of simple organic compounds important in living things as a source of both energy and structure
- 11. A substance that is present before a chemical reaction and takes part in it, usually shown on the left hand side of a chemical equation.
- 13. The ability to do work. Especially in biology, the driver of the physical and chemical processes necessary for life.
- 14. The attraction between like particles within polar substances.
- 18. A naturally occurring catalyst, usually a protein