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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 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






2. Second quantum number - designated by the letter 'l.' This 'angular momentum' refers to the subshells within each principle quantum energy level. It can take on the value of an integer in the 0 to (n -1) range. The four subshellscorresponding to l=0






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






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






5. A measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete






6. 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.






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






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






9. Named after their cation and anion






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


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






12. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






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






14. Any sample of a given compound will contain the same elements in the identical mass ratio.






15. 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


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






17. 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.






18. Tells you how much solute is present compared to the amount of solvent






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






20. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






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






22. 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.






23. 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






24. 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.






25. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






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






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






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






30. Chalcogens - - Oxide O






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






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






33. The amount of energy that reactants must absorb before a chemical reaction will start; also called free energy of activation.






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






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






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






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






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






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






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






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






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






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






44. The lowest allowable energy state of an atom






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






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






47. A horizontal row of elements in the periodic table






48. A pair of equal and opposite electric charges or magnetic poles separated by a small distance






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






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