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Ahh? Ummm? HUH? DOH! 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500

The monomer of proteins Amino acids The monomer of proteins Row 1, Col 1

polymer Many monomers 1,2

The symbol for the hydrogen ion 1,3

An atom that has accepted one or more electrons has this charge negative An atom that has accepted one or more electrons has this charge 1,4

acid More hydrogen ions 2,1

An atom consists of these three kinds of particles Protons, neutrons and electrons An atom consists of these three kinds of particles 2,2

substrate An enzyme attaches to a/an __________ and lowers the activation energy so a reaction can occur 2,3

More hydroxide ions. Less hydrogen ions base More hydroxide ions. Less hydrogen ions 2,4

atom The simplest particle of an element that retains all of the properties of the element 3,1

The positively charged particles found in the nucleus of the atom. protons The positively charged particles found in the nucleus of the atom. 3,2

These are changed in a chemical reaction reactants These are changed in a chemical reaction 3,3

oxygen, carbon, nitrogen, and hydrogen The four elements that constitute most of the mass of all living things 3,4

A positive ion is attracted to a negative ion to form this ionic bond A positive ion is attracted to a negative ion to form this 4,1

A chemical reaction that involves a net release of energy exothermic A chemical reaction that involves a net release of energy 4,2

These reduce the amount of activation energy needed Catalysts/ enzymes These reduce the amount of activation energy needed 4,3

The substance in which the solute is dissolved solvent The substance in which the solute is dissolved 4,4

These reactions are indicated by a two direction arrow. Reversible or equilibrium These reactions are indicated by a two direction arrow. 5,1

solution A mixture in which one or more substances are uniformly distributed in another. 5,2

Formed when two or more atoms share one or more pairs of electrons Covalent bonds Formed when two or more atoms share one or more pairs of electrons 5,3

Reactions that involve a net absorption of free energy endothermic Reactions that involve a net absorption of free energy 5,4