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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. 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.






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






3. Product of the molar concentrations of dissociated ions in solution at any point in the reaction other than equilibrium or saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted IP.






4. The area of chemistry that is concerned with reaction rates and reaction mechanisms






5. Numbers that specify the properties of atomic orbitals and of their electrons






6. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






7. 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.






8. The vapor pressure of solution is the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. P_a=X_aP_total

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9. 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






10. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






11. The energy required to break a chemical bond and form neutral isolated atoms






12. Mixture of 2 or more substances that distills at a constant temperature and with constant composition - even though seperately the components have different boiling points






13. 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






14. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12






15. A solution in which water is the solvent






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






17. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






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






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






20. The slowest elementary step which is the limit for the rate of the other steps






21. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






22. A set of spectral lines that appear in the visible light region when a hydrogen atom undergoes a transition from energy levels n>2 to n=2.






23. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






24. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






25. Sum of the protons and neutrons in an element often denoted by the letter A






26. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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27. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron - and all electrons in singly occupied orbitals must have the same spin

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28. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge






29. Redox reaction - in which the same species is both oxidized and reduced.






30. Set of spectral lines appearing in the UV region when a hydrogen atom undergoes a transition from energy levels n>1 to n=1.






31. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T

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32. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






33. A horizontal row of elements in the periodic table






34. The maximum amount of product that can be produced from a given amount of reactant






35. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule

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36. Attractive and repulsive forces between molecules that are weaker than forces within molecules.






37. A naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers






38. A reaction in which atoms of one element take the place of atoms of another element in a compound






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






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






41. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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42. An ionic compound that resists changes in its pH






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






44. Elements in the middle of the periodic table - in groups 3-12.






45. 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






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






47. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.






48. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






49. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






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