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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. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.






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






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






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






5. 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.






6. Sum of the protons and neutrons in an element often denoted by the letter A






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






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


9. 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






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






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






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






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






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






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






16. 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






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






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






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






20. 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






21. E=hc/?






22. 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


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






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






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






26. The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






27. 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.






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






29. 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






30. 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






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






32. 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






33. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






34. Two or more atoms held together by covalent bonds






35. 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-






36. Substance in which a solute is dissolved to form a solution






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






38. 5 valence electrons -3 ions - Nitride N






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






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






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






42. Set of spectral lines appearing in the UV region when a hydrogen atom undergoes a transition from energy levels n>1 to n=1.






43. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






44. 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






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






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






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






48. Elements in the middle of the periodic table - in groups 3-12.






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






50. Temperature is constant; effusion and temperature are proportional to the square root of their masses