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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 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






2. 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.






3. A physical property of a solution that depends on the number - but not the identity - of the disswolved solute particles; example properties include vapor pressure lowering - boiling point elevation - osmotic pressure - and frezzing point depression






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






5. 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






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. The tendency for an atom to attract electrons to itself when it is chemically combined with another element






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






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






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






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






12. A horizontal row of elements in the periodic table






13. Solids in which the particles are arranged in a repeating - 3- D pattern - has a specific melting point - classified as ionic network covalent - metallic or molecular.






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






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






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






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






18. The ways in which electrons are arranged in various orbitals around the nuclei of atoms






19. 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






20. 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






21. A definite stable energy that a physical system can have






22. 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






23. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






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






25. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






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






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






28. PH=pka+log[base/acid] Used in titration based problems that relates the pH or pOH of a solution to the pK and the ratio of the dissociated species.






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






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






31. 2.18 x 10^-18 J/electron






32. Any sample of a given compound will contain the same elements in the identical mass ratio.






33. Two or more atoms held together by covalent bonds






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






35. Sol - a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound






36. 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.






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






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






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






40. 5 valence electrons -3 ions - Nitride N






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






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






43. Theory stating that the rate of a reaction is directly proportional to the number of collisions that take place between reactants per second.






44. 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






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






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






47. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






48. 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






49. 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






50. 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







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