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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. 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






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






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






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






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






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






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






8. 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.






9. Property of the elements that can be predicted from the arrangement of the periodic table






10. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






11. Simplest whole # ration of atoms in a compound






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






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






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






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






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






17. Attractive and repulsive forces between molecules that are weaker than forces within molecules.






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






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






20. A base that can accept two moles of H+ per mole of itself (ex: SO4






21. 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






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






23. 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


24. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






25. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






26. 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






27. 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






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






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






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






31. 5 valence electrons -3 ions - Nitride N






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






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






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






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


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






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






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






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






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






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






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






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






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






45. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






46. 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






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






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






49. 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






50. (chemistry) a substance that changes color to indicate the presence of some ion or substance