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






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






3. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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4. 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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5. 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.






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






7. 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






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






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






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






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






12. 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






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






14. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






15. (physics) the smallest discrete quantity of some physical property that a system can possess (according to quantum theory) E=hf






16. 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






17. 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.






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






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






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






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






22. 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






23. Redox reaction - in which the same species is both oxidized and reduced.






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






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






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






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






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






29. 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






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






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






32. 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






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






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






35. A solution in which water is the solvent






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






37. 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






38. Small discrete increments of energy.






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






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






41. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






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






43. 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






44. An ionic compound that resists changes in its pH






45. 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






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






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






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






49. 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-






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