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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. Common definition of acids as proton (H+) donors and bases as proton acceptors






2. 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






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






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






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






6. 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






7. 2.18 x 10^-18 J/electron






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






9. 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






10. 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-






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






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






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






14. An ionic compound that resists changes in its pH






15. Slightly less reactive than alkali metals - comprise group II






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






17. 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.






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






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






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






21. 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






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






23. 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


24. E=hc/?






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






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






27. 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.






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






29. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T


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






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






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






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






34. A reaction in which atoms of one element take the place of atoms of another element in a compound






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






36. A reaction in which atoms of one element take the place of atoms of another element in a compound






37. 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






38. (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight






39. Chalcogens - - Oxide O






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






41. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






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






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






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






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






46. 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.






47. Named after their cation and anion






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






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






50. Simplest whole # ration of atoms in a compound