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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. Spectrum of certain absorbed wavelengths of light corresponding to an atom's spectrum of emitted frequencies of light. Unique to each element. AAS can be used to indentify an element.






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






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






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






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






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






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






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






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






10. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






11. 5 different orbitals shaped like clover leaves and max electrons is 10






12. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






13. 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






14. A horizontal row of elements in the periodic table






15. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu






16. 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






17. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






18. 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-






19. 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.






20. 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






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

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






23. Simplest whole # ration of atoms in a compound






24. 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






25. Theory stating that the rate of a reaction is directly proportional to the number of collisions that take place between reactants per second.






26. 2.18 x 10^-18 J/electron






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






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






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






30. 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






31. 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.






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






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






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






35. 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






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






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






38. Have the shape of a sphere - with the center of the sphere at the nucleus; completely symmetrical along all axes; 1s orbital is spherically symmetric and has no nodes; 2s orbital is also spherical but contains a node and is higher in energy






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






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






41. 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.






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






43. 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






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






45. 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






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






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






48. 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






49. Property of the elements that can be predicted from the arrangement of the periodic table






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







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