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






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






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






4. The lowest allowable energy state of an atom






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






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






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






8. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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


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






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


12. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






13. 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






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






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






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






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






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






20. Small discrete increments of energy.






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






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






23. 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.






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






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






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






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






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






29. A solution in which water is the solvent






30. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.






31. A chemical bond that involves sharing a pair of electrons between atoms in a molecule






32. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






33. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






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






35. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






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






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






38. Named after their cation and anion






39. 2.18 x 10^-18 J/electron






40. A definite stable energy that a physical system can have






41. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid


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






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






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






45. 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






46. A reaction where a compound does Not change its molecular structure.






47. 5 different orbitals shaped like clover leaves and max electrons is 10






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






49. 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






50. 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.