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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 point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






2. 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






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






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






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






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






7. 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






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






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






10. 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






11. 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.






12. 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.






13. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






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






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






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






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






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






19. 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






20. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






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






22. 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.






23. 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






24. A dynamic condition in which two opposing changes occur at equal rates in a closed system






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






26. 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.






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






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






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






30. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu






31. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






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






33. A solution in which water is the solvent






34. 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






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






36. 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






37. A horizontal row of elements in the periodic table






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






39. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






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






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






42. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






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






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






45. Named after their cation and anion






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






47. 5 valence electrons -3 ions - Nitride N






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






49. 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






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