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






2. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






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

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






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






6. 5 valence electrons -3 ions - Nitride N






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






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






10. The center of the atom which contains the protons and neutrons; in cells - structure that contains the cell's genetic material (DNA) and controls the cell's activities






11. Chalcogens - - Oxide O






12. 5 different orbitals shaped like clover leaves and max electrons is 10






13. 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






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






15. The lowest allowable energy state of an atom






16. Product of the molar concentrations of dissociated ions in solution at any point in the reaction other than equilibrium or saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted IP.






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






18. 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






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






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






21. The percent by mass of each element in a compound






22. 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

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23. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






24. 2.18 x 10^-18 J/electron






25. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






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






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






28. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






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






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






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






32. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






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. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






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






36. A horizontal row of elements in the periodic table






37. 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.






38. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water






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






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






41. 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






42. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






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






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






45. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






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






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






48. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






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






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