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






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






3. Having characteristics of both an acid and a base and capable of reacting as either






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






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






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






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






8. Small discrete increments of energy.






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






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






11. 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.






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






13. Spectrum of certain absorbed wavelengths of light corresponding to an atom's spectrum of emitted frequencies of light. Unique to each element. AAS can be used to indentify an element.






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






15. Chalcogens - - Oxide O






16. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






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






18. 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






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






20. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






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






22. 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.






23. 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.






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






25. 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.






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






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






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






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






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






31. 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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32. 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






33. 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






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






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






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






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






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






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






40. (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles






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






42. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge






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






44. Simplest whole # ration of atoms in a compound






45. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






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






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






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






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






50. A dynamic condition in which two opposing changes occur at equal rates in a closed system






Can you answer 50 questions in 15 minutes?



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