1. What Am I?

2. I am a type of mixture; I am formed when one substance, such as water, dissolves other substances.
Solution

3. I am a chemical reaction that absorbs more energy than I release; my products have a higher bond energy than my reactants
Endothermic

4. I am the type of molecule that stores genetic information in living things
Nucleic acid

5. I am an attraction between a slightly positive hydrogen atom and a slightly negative atom, such as oxygen or nitrogen
Hydrogen bond

6. I am a catalyst for a chemical reaction in living things; in almost all cases I am a protein
Enzyme

7. Chemical bonds hold me together; I always contain atoms of more than one element
Compound

8. I am a carbon chain found in many lipids; I can be either saturated or unsaturated
Fatty acid

9. I have a positive charge if I lose an electron; I have a negative charge if I gain an electron
Ion

10. I am a reactant an enzyme acts on; I bind to an enzyme’s active site
Substrate

11. I am made of amino acids; there are many different types of me with many different functions in living things.
Protein

12. I am a type of bond that involves sharing of an electron pair; I hold together a water molecule.
Covalent bond

13. I am an attraction between different types of molecules; I am the reason why water clings to glass.
Adhesion

14. I contain carbon, hydrogen, and oxygen; Sometimes I am found in the cell walls of plants
Carbohydrate (or polysaccharide, or cellulose)

15. I am the amount of energy that is needed for a chemical reaction to start; after I am added, the reaction can take place on its own
Activation energy

16. I am always found in organic molecules.
Carbon

17. Same or Different? Do the pair of words describe the same thing or different things?
Atom/Element
Same
Solvent/Solute
Different
Acid/Base
Catalyst/Enzyme

18. Cohesion/Adhesion
Different
Monomer/Polymer
Enzyme/Protein
Same
Endothermic/Exothermic

19. Substrate/Reactant
Same
Compound/Element
Different

20. Situational Vocabulary: Which choice most closely relates to the vocabulary word?
Amino Acid: (a) lemon juice in iced tea (b) one of many beads on a string
(b)
Atom: (a) unicellular organism (b) multicellular organism
(a)
Covalent bond: (a) linking hands in a human chain (b) passing a basketball

21. Lipid: (a) a car’s headlights (b) a car’s gas tank
Activation energy: (a) starting a lawn-mower with the pull cord (b) eating sugary foods
(a)
Solute: (a) getting lost in a crowd (b) answering a math problem

22. Water molecule: (a) a ring (b) head and ears of a cartoon mouse
Activation energy: (a) a mountain (b) long, capital letter E
(a)
Triglyceride: (a) long, capital letter E (b) jigsaw puzzle pieces

23. pH scale: (a) letters of the alphabet (b) meterstick
Starch: (a) savings account in a bank (b) loose change in your pocket
(a)
Amino acids: (a) letters of the alphabet (b) magnets