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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. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






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






3. 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






4. 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






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






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






7. Small discrete increments of energy.






8. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge






9. A reaction in which two or more substances combine to form a single substance A+B>>>>>>>C






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






11. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






12. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






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






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






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






16. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






17. 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






18. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






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






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






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






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

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






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






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






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






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






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






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






30. 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.






31. 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






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






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






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






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






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






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






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






40. (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers






41. Attractions between molecules caused by the electron motion on one molecule affecting the electron motion on the other through electrical forces; these are the weakest interactions between molecules






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






43. 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.






44. 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






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






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






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






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






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






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







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