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






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






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






4. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






5. A chemical bond that involves sharing a pair of electrons between atoms in a molecule






6. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






7. A horizontal row of elements in the periodic table






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






9. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






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






11. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






12. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






13. 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






14. 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.






15. 5 different orbitals shaped like clover leaves and max electrons is 10






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






17. A set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors






18. 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






19. An ionic compound that resists changes in its pH






20. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






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






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


23. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






24. 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


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






26. Rare earth element group (elements 58-71)






27. Sol - a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound






28. 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


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






30. The average distance between the nuclei of two bonded atoms






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


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






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






34. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






35. 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.






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






37. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.






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






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






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






41. A chemical formula showing the ratio of elements in a compound rather than the total number of atoms






42. A solution in which water is the solvent






43. Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas - usually eight valence electrons






44. 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






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






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. Expression of auto - ionization of water into H+ and OH- at a certain temperature - given by the product of the ions' molar concentrations. Denoted by Kw and equal to 10-






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






49. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled






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