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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






2. 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






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






4. 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






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






6. 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






7. A solution in which water is the solvent






8. 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






9. 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-






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






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






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






13. A naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers






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






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






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






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






18. Acids defined as electron - pair acceptors and bases as electron - pair donors.






19. 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






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






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






22. 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






23. Two or more atoms held together by covalent bonds






24. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.






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






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






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






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






29. Keq describes the ratio of product concentration to reactant concentration - with each raised to the power corresponding ot its coefficient ion in the balanced equation






30. 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






31. A set of spectral lines that appear in the visible light region when a hydrogen atom undergoes a transition from energy levels n>2 to n=2.






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






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






34. 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


35. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






36. 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






37. 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






38. The Percent by mass of each element in a compound.






39. The lowest allowable energy state of an atom






40. 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.






41. The process of decomposing a chemical compound by the passage of an electric current.






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






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






44. Mixture of 2 or more substances that distills at a constant temperature and with constant composition - even though seperately the components have different boiling points






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






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






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






48. 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.






49. Small discrete increments of energy.






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