Across
- 2. chemical bond which forms when two atoms share electrons
- 5. reaction that released energy in the form of heat
- 9. a homogeneous mixture formed when a substance is dissolved in a another substance
- 12. substances that release hydroxide ions when dissolved in water
- 14. a pure substance with unique properties formed when two or more different elements com
- 17. substance that speeds up a chemical reaction by reducing the needed amount of activation energy
- 19. a combination of two or more substance in which each component retains its individual characteristics
- 20. the minimum amount of energy needed for the reactants to form products in a chemical reaction
- 24. an electrical attraction between two oppositely charged atoms or groups of atoms
- 25. complex macromolecules that store and transmit genetic information
- 26. large molecules made from smaller repeating units of identical or nearly identical compounds linked by covelent bonds
- 29. molecule with oppositely charged regions
- 33. protein that speeds up a biological reaction by lowering the amount of activation energy needed to start the reaction
- 34. substance(s) that exists before a chemical reaction starts
- 36. particle with no charge located in the center of an atom
- 37. A pure substance composed of only one type of atom. A pure substance that cannot be broken down into other substances by physical or chemical means
- 38. two or more atoms of the same element having different number of neutron
Down
- 1. a compound in which the atoms are held together by covalent bonds
- 3. negatively charged particle located outside the nucleus
- 4. substances that release hydrogen ions when dissolved in water
- 6. large molecules formed by joining smaller organic molecules together
- 7. small compounds made up of carbon, nitrogen, oxygen, hydrogen, and sometimes sulfur. The building block of protein
- 8. reaction that absorbed heat energy
- 9. reactants that bind to the enzyme
- 10. mixtures that can react with acids or bases to keep pH within a particular range
- 11. der Waals the attractive force between the positive and negative regions of different molecules
- 13. the substance that is dissolved in the solvent
- 15. the measure of the concentration of hydrogen ions present in a solution
- 16. organic compounds made of small carbon compounds called amino acids joined by peptide bonds
- 18. energy-requiring process by which atoms or groups of atoms are changed into different substances
- 21. atom that is negatively or positively charged because it has lost or gained one or more electrons
- 22. a subunit of nucleic acid formed from a simple sugar, a phosphate group, and a nitrogen base
- 23. compounds composed of carbon, hydrogen, and oxygen in a ratio of one oxygen and two hydrogen atoms for each carbon ato
- 26. positively charged particle located in the center of an atom
- 27. hydrophobic biological molecules made mostly of carbon and hydrogen atoms that make up fats, oils, and waxes
- 28. the substance in which another substance is dissolved
- 30. substance(s) formed during the chemical reaction
- 31. weak electrostatic bond formed by the attraction of opposite charges between a hydrogen atom and oxygen, flourine, or nitrogen atom
- 32. located at the center of the atom, consists of protons and neutrons
- 35. the building blocks of matter; contain subatomic particles: neutrons, electrons, and protons