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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Redox reaction - in which the same species is both oxidized and reduced.






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






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






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






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






7. 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






8. The maximum amount of product that can be produced from a given amount of reactant






9. Simplest whole # ration of atoms in a compound






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






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






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






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






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






15. 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






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






17. Two or more atoms held together by covalent bonds






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






19. Small discrete increments of energy.






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






21. The average distance between the nuclei of two bonded atoms






22. 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






23. 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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24. 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.






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






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






27. Having characteristics of both an acid and a base and capable of reacting as either






28. A horizontal row of elements in the periodic table






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






30. 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






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






32. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq






33. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






34. Acids defined as electron - pair acceptors and bases as electron - pair donors.






35. A solution in which water is the solvent






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






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






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






39. 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






40. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






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






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






43. 5 different orbitals shaped like clover leaves and max electrons is 10






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






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






46. 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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47. 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.






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






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






50. The lowest allowable energy state of an atom