What Am I?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

I am always found in organic molecules. Carbon

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

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

Substrate/Reactant Same Compound/Element Different

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

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

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

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