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






2. An ionic compound that resists changes in its pH






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






4. 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






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






6. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






7. 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.






8. 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






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






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






11. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T

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12. 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






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






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






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






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

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






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






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






21. 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






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






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






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






25. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






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






27. 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






28. 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






29. The percent by mass of each element in a compound






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






31. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






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






33. 5 valence electrons -3 ions - Nitride N






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






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






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






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






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






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






40. 2.18 x 10^-18 J/electron






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






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






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






44. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






45. 5 different orbitals shaped like clover leaves and max electrons is 10






46. 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






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






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






49. 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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50. A horizontal row of elements in the periodic table