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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. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule

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






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






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






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






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






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






8. 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.






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






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






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






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






13. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.






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






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






16. 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






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






18. 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.






19. 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






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






21. 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






22. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






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






25. 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.






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






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






28. An ionic compound that resists changes in its pH






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






30. 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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31. Chalcogens - - Oxide O






32. 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






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






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






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






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






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






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






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






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






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






42. 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






43. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






44. 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






45. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






46. 5 valence electrons -3 ions - Nitride N






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






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






49. 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






50. 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