biology final review2

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Across
  1. 2. The substances formed as a result of a chemical reaction.
  2. 4. A substance made up of only one type of atom.
  3. 5. The starting substances in a chemical reaction.
  4. 6. A negatively charged particle that orbits the nucleus of an atom.
  5. 12. Molecules that have a partial positive and negative charge due to uneven sharing of electrons.
  6. 13. A type of bond where electrons are transferred from one atom to another, creating charged ions.
  7. 14. A scale that measures the acidity or basicity of a solution.
  8. 16. The specific region of an enzyme where the substrate binds.
  9. 17. A neutral particle in the nucleus of an atom.
  10. 20. An atom or molecule with a charge due to the loss or gain of electrons.
  11. 22. The substance that is dissolved in a solvent.
  12. 23. A weak bond between a hydrogen atom and an electronegative atom (like oxygen or nitrogen).
  13. 24. Biological catalysts that speed up chemical reactions in living organisms.
  14. 26. The smallest unit of matter, consisting of protons, neutrons, and electrons.
  15. 27. The central part of an atom, containing protons and neutrons.
  16. 29. A process in which substances are transformed into new substances.
  17. 30. A substance that dissolves other substances (e.g., water).
Down
  1. 1. An enzyme that breaks down proteins.
  2. 3. The energy required to start a chemical reaction.
  3. 7. An enzyme that breaks down fats (lipids).
  4. 8. An enzyme that breaks down alcohols, such as ethanol.
  5. 9. A homogeneous mixture of solute and solvent.
  6. 10. A substance formed by the chemical combination of two or more elements.
  7. 11. Weak attractive forces between molecules due to temporary dipoles.
  8. 14. A positively charged particle in the nucleus of an atom.
  9. 15. The reactants in an enzyme-catalyzed reaction.
  10. 18. An enzyme that breaks down starches into sugars.
  11. 19. A bond formed by the sharing of electrons between atoms.
  12. 21. Atoms of the same element with a different number of neutrons.
  13. 25. Two or more atoms bonded together.
  14. 28. A substance that speeds up a chemical reaction without being consumed.