Biology ch.2 Number 2

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Across
  1. 2. The central cord of an atom consists of two kinds of particles
  2. 4. Is the energy in a system that is available for work
  3. 5. Solid,liquid and Gas is the _________ of matter
  4. 7. This term refers to a base
  5. 8. Substance dissolved in the solution
  6. 10. When an atom or molecule with an electrical charge is called this….
  7. 11. The number of protons in an atom is called this
  8. 14. A catalyst, usually a protein, in living system
  9. 15. Forms two atoms share one or more pairs of electrons
  10. 17. Reactions that involve a net absorption of free energy are called
  11. 19. Scale that compares the relative con
  12. 21. - the ion H3O+, consisting of a protonated water molecule and present in all aqueous acids.
  13. 22. Any substance that increases the concentration of hydroxide ions when added to a water solution
Down
  1. 1. Is the quantity of matter an object has
  2. 3. Combining in ways that cause their atoms to become stable
  3. 6. In many chemical reactions, the amount of energy needed to start the reaction is called this
  4. 9. Are pure substance that can’t be broken down chemically into simpler kinds of matter
  5. 12. The simplest part of a substance that retains all of the properties of the substance and that can exists in a free state
  6. 13. The reaction in which electrons are transferred between atoms are known as ___________.
  7. 16. compound formed by a chemical reaction
  8. 18. A measurement of the amount solute dissolved in a fixed amount of solvent
  9. 20. Substance in which the solute is dissolved