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






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






3. 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.






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






5. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






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






7. Named after their cation and anion






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






9. 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






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






11. A definite stable energy that a physical system can have






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






13. 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






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






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






16. 2.18 x 10^-18 J/electron






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

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






19. A solution in which water is the solvent






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






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






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






23. 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






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






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






26. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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






28. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






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






30. A horizontal row of elements in the periodic table






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






32. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






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






34. A chemical bond that involves sharing a pair of electrons between atoms in a molecule






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






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






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






38. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






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






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






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






42. Elements in the middle of the periodic table - in groups 3-12.






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






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






46. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






47. 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






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






49. Two or more atoms held together by covalent bonds






50. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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