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






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






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






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






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






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






7. 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






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






9. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






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






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






12. 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.






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






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






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






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






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






18. 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






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






20. 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






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






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






23. 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






24. 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






25. Common definition of acids as proton (H+) donors and bases as proton acceptors






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






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






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






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






31. An ionic compound that resists changes in its pH






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






33. 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






34. 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.






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






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






37. 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-






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






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






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






41. 2.18 x 10^-18 J/electron






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






43. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






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






45. 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






46. Gram equivalent weight of solute per liter of solution - often denoted by N.






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






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






49. Small discrete increments of energy.






50. Simplest whole # ration of atoms in a compound