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Molecules are formed by bonding between atoms. Bonds are formed when electrons from one atom interact with another atom. The bonds between the atoms which make up a molecule are strong covalent bonds; bonds between molecules are generally weak bonds such as ionic and hydrogen bonds.

■ Compare the relative strengths of covalent, hydrogen, and ionic bonds.

■ Which of these bonds requires an enzyme to break it?

■ Why does an atom that gives up electrons become positively charged? What causes the positive charge?

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