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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 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






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






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






4. 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.






5. Numbers that specify the properties of atomic orbitals and of their electrons






6. Small discrete increments of energy.






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






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

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






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






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






13. 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.






14. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






16. 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






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






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. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






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






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






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






23. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






24. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12






25. 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






26. 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






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






28. A horizontal row of elements in the periodic table






29. 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.






30. An equilibrium expression used to measure weak - acid strength - given by the ratio of the product of the products' molar concentrations to the product of the reactants' molar concentrations - with each term raised to the power of its stoichiometric






31. 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.






32. 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






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






34. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






35. A solution in which water is the solvent






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






37. Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas - usually eight valence electrons






38. Expression of auto - ionization of water into H+ and OH- at a certain temperature - given by the product of the ions' molar concentrations. Denoted by Kw and equal to 10-






39. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






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






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






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






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






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






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






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






47. E=hc/?






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






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






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