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






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






3. 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






4. Sum of all the masses - in AMU - present in one molecule of a molecular compound.






5. 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






6. 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






7. Slightly less reactive than alkali metals - comprise group II






8. 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

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






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






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






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






14. Set of spectral lines appearing in the UV region when a hydrogen atom undergoes a transition from energy levels n>1 to n=1.






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






16. A reaction where a compound does Not change its molecular structure.






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






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






19. Product of the molar concentrations of dissociated ions in solution at any point in the reaction other than equilibrium or saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted IP.






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






21. 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.






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






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






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






25. 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.






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






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






28. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






29. An atom or group of atoms that has a positive or negative charge






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






31. 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






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






33. 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






34. 5 valence electrons -3 ions - Nitride N






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






36. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






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






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






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






40. A solution in which water is the solvent






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






42. 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






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






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






45. 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






46. A horizontal row of elements in the periodic table






47. 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






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






49. 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






50. The weak attractive forces between molecules resulting from the small - instantaneous dipoles that occur because of the varying positions of the electrons during their motion about nuclei