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






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






3. 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






4. 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.






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






6. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.






7. The weight in grams of compound that can be substituted by 1 atom of Hydrogen. GEW = MW / # of acidic Hyrdogens






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






9. 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






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






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






12. 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






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






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






15. 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






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






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






18. A chemical reaction involving the transfer of one or more electrons from one reactant to another; also called oxidation - reduction reaction.






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






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






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






22. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron - and all electrons in singly occupied orbitals must have the same spin

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






24. 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






25. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu






26. A measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete






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






28. 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






29. A representation of a displacement reaction showing only the reactive species and omitting the spectator ions.






30. A chemical reaction involving the transfer of one or more electrons from one reactant to another; also called oxidation - reduction reaction.






31. 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






32. 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






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






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






35. Small discrete increments of energy.






36. 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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37. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






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






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






40. 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.






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






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






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






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






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






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






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






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






49. 2.18 x 10^-18 J/electron






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