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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. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






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






3. Set of spectral lines appearing in the UV region when a hydrogen atom undergoes a transition from energy levels n>1 to n=1.






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






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






6. Where half of the acid is neutralized by the base on a titration curveAn acid dissociation constant - Ka - (also known as acidity constant - or acid - ionization constant) is a quantitative measure of the strength of an acid in solution. It is the eq






7. 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.






8. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






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






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






11. A solution in which water is the solvent






12. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






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






14. 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-






15. 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






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






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






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






20. 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






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






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






23. 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






24. 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.






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






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






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






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






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






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






31. Keq describes the ratio of product concentration to reactant concentration - with each raised to the power corresponding ot its coefficient ion in the balanced equation






32. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






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






34. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






35. 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






36. Mixture of 2 or more substances that distills at a constant temperature and with constant composition - even though seperately the components have different boiling points






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






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






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






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

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






42. Nh/2p The angular momentum changes only in discete amounts with respect to the quantum number. Also E=- R_h/n^2






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






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






45. 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.






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






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






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






49. E=hc/?






50. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance C>>>>A+B







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