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






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






3. 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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4. A substance that - when dissolved in water - results in a solution that can conduct electricity






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






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






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






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






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






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






11. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






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






13. 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.






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






15. 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






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






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






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






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






20. Named after their cation and anion






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






22. 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.






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






24. An equilibrium expression used to measure weak - acid strength - given by the ratio of the product of the products' molar concentrations to the product of the reactants' molar concentrations - with each term raised to the power of its stoichiometric






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






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






29. The lowest allowable energy state of an atom






30. (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers






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






32. 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

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33. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






34. 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.






35. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






36. 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






37. One - half of the distance between the center of identical atoms that are not bonded together. Since effective nuclear charge increases when moving from left to right each additional electron is pulled more strogly toward the nucleus.






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






39. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






40. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






41. Tells you how much solute is present compared to the amount of solvent






42. Two or more atoms held together by covalent bonds






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






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






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






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






47. 5 valence electrons -3 ions - Nitride N






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






49. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






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







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