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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 ways in which electrons are arranged in various orbitals around the nuclei of atoms






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






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






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






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






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






7. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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8. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






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






10. 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






11. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






12. 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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13. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






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






15. Redox reaction - in which the same species is both oxidized and reduced.






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






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






18. 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






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






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






22. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






23. 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.






24. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






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






26. 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.






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






28. 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






29. 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






30. The pressure exerted by a vapor in equilibrium with its liquid or solid phase






31. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






33. 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






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






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






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






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






38. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






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






41. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






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






43. 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






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






45. 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






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






47. 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






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






49. 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.






50. Simplest whole # ration of atoms in a compound







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