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






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






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






4. PH of a molecule at which it contains no net electric charge - isoelectric point.






5. 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.






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






7. The quantum number that has only two possible values - +1/2 and -1/2 - which indicate the two fundamental spin states of an electron in an orbital






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






9. 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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10. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






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






12. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






13. 5 valence electrons -3 ions - Nitride N






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






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






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






17. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.






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






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






20. The process by which a gas escapes from one container to another at lower pressure through a tiny hole in the container.






21. 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.






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






23. A dynamic condition in which two opposing changes occur at equal rates in a closed system






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






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






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






28. 5 different orbitals shaped like clover leaves and max electrons is 10






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






30. 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






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






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






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






34. A substance that - when dissolved in water - results in a solution that can conduct electricity






35. A horizontal row of elements in the periodic table






36. Acids defined as electron - pair acceptors and bases as electron - pair donors.






37. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






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






39. 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.






40. The sum of the exponents in a rate law - where each exponent provides the reaction order with respect to its reactants






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






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






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






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






45. A solution in which water is the solvent






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






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






48. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






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






50. 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