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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A chemical reaction involving the transfer of one or more electrons from one reactant to another; also called oxidation - reduction reaction.






2. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq






3. A concentration unit of a solution expressed as moles of solute dissolved per liter of solution






4. The center of the atom which contains the protons and neutrons; in cells - structure that contains the cell's genetic material (DNA) and controls the cell's activities






5. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






6. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






7. A horizontal row of elements in the periodic table






8. 2.18 x 10^-18 J/electron






9. A pair of equal and opposite electric charges or magnetic poles separated by a small distance






10. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






11. Any sample of a given compound will contain the same elements in the identical mass ratio.






12. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated






13. The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






14. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






15. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance






16. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






17. Attractions between molecules caused by the electron motion on one molecule affecting the electron motion on the other through electrical forces; these are the weakest interactions between molecules






18. (chemistry) a substance that changes color to indicate the presence of some ion or substance






19. A subdivision of an energy level in an atom. They are divided into orbitals.






20. A definite stable energy that a physical system can have






21. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






22. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance C>>>>A+B






23. An elementary particle with 0 charge and mass about equal to a proton






24. Structure that occurs when it is possible to draw two or more valid electron dot structures that have the same number of electron pairs for a molecule or ion






25. A chemical reaction involving the transfer of one or more electrons from one reactant to another; also called oxidation - reduction reaction.






26. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






27. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






28. A measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete






29. Named after their cation and anion






30. The process of decomposing a chemical compound by the passage of an electric current.






31. In a solution - the substance that dissolves in the solvent






32. The tendency for an atom to attract electrons to itself when it is chemically combined with another element






33. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






34. One - half of the distance between the center of identical atoms that are not bonded together. Since effective nuclear charge increases when moving from left to right each additional electron is pulled more strogly toward the nucleus.






35. Having characteristics of both an acid and a base and capable of reacting as either






36. A base that can accept two moles of H+ per mole of itself (ex: SO4






37. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






38. (chemistry) p(otential of) H(ydrogen)






39. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






40. Gram equivalent weight of solute per liter of solution - often denoted by N.






41. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.






42. Common definition of acids as proton (H+) donors and bases as proton acceptors






43. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






44. Simplest whole # ration of atoms in a compound






45. Substance in which a solute is dissolved to form a solution






46. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






47. A physical property of a solution that depends on the number - but not the identity - of the disswolved solute particles; example properties include vapor pressure lowering - boiling point elevation - osmotic pressure - and frezzing point depression






48. A solid made up of particles that are not arranged in a regular pattern.






49. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






50. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water