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






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






3. 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






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






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






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






7. 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.






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






9. 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






10. 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






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






12. 5 valence electrons -3 ions - Nitride N






13. 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






14. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






15. 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






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






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






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






19. 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






20. 5 different orbitals shaped like clover leaves and max electrons is 10






21. Named after their cation and anion






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






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






24. E=hc/?






25. 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.






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






27. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated






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






29. 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






30. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






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






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






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






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






35. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






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






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






38. 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






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






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






41. 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






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






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






44. 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






45. 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






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






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






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






49. 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






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







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