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






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






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






4. 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.






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






6. 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






7. The tendency for an atom to attract electrons to itself when it is chemically combined with another element






8. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance






9. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






10. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water






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






12. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






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






15. 5 different orbitals shaped like clover leaves and max electrons is 10






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






17. 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






18. Two or more atoms held together by covalent bonds






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






20. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






21. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






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






23. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






24. 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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25. The percent by mass of each element in a compound






26. 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






27. Small discrete increments of energy.






28. A horizontal row of elements in the periodic table






29. 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






30. The molar amount of a solute that can dissolve in 1L of solvent until equilibrium - saturation - is reached






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






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






33. Have the shape of a sphere - with the center of the sphere at the nucleus; completely symmetrical along all axes; 1s orbital is spherically symmetric and has no nodes; 2s orbital is also spherical but contains a node and is higher in energy






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

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






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






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






39. 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






40. 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.






41. 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.






42. 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.






43. 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






44. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






45. 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.






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






47. 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.






48. The lowest allowable energy state of an atom






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






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