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






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






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






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






5. A horizontal row of elements in the periodic table






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






7. 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






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






9. 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






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






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






12. Small discrete increments of energy.






13. 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






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






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






16. 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-






17. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






19. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






20. Named after their cation and anion






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






22. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule

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23. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






24. 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






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






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






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






28. 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






29. 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.






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






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






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






33. 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






34. 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.






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






36. 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.






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






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






39. 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






40. A solution in which water is the solvent






41. The lowest allowable energy state of an atom






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






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






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






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






46. A naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers






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






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






49. E=hc/?






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