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






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






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






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






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






6. The Percent by mass of each element in a compound.






7. Two or more atoms held together by covalent bonds






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






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






10. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






11. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






13. The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule






14. The lowest allowable energy state of an atom






15. The molar amount of a solute that can dissolve in 1L of solvent until equilibrium - saturation - is reached






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






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






18. 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






19. 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.






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






22. The ways in which electrons are arranged in various orbitals around the nuclei of atoms






23. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






24. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






25. A solution in which water is the solvent






26. The percent by mass of each element in a compound






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






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






29. The weight in grams of compound that can be substituted by 1 atom of Hydrogen. GEW = MW / # of acidic Hyrdogens






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

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






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






33. A reaction in which two or more substances combine to form a single substance A+B>>>>>>>C






34. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






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






36. The pressure exerted by a vapor in equilibrium with its liquid or solid phase






37. 5 valence electrons -3 ions - Nitride N






38. 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






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






40. 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






41. A representation of a displacement reaction showing only the reactive species and omitting the spectator ions.






42. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






43. 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.






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






45. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






46. (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers






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






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






49. 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.






50. Named after their cation and anion