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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. 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.






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






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

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






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






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






9. 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






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






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






12. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






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






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






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






18. The process by which one or more substances change to produce one or more different substances






19. 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.






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






21. 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






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






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






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






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






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






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






28. Chalcogens - - Oxide O






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






30. 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-






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






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






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

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34. 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.






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






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






37. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






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






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






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






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






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






43. Keq describes the ratio of product concentration to reactant concentration - with each raised to the power corresponding ot its coefficient ion in the balanced equation






44. 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






45. 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






46. A base that can accept two moles of H+ per mole of itself (ex: SO4






47. A subdivision of an energy level in an atom. They are divided into orbitals.






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






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






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