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






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






3. Chalcogens - - Oxide O






4. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






5. 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.






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






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






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






9. 5 different orbitals shaped like clover leaves and max electrons is 10






10. Temperature is constant; effusion and temperature are proportional to the square root of their masses

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11. An ionic compound that resists changes in its pH






12. 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






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






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






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






16. Named after their cation and anion






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






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






19. 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






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






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






22. 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






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






24. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water






25. 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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26. 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.






27. E=hc/?






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






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






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






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






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






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






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






35. The lowest allowable energy state of an atom






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






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






38. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






39. The nuclear charge experienced by the outermost electrons of an atom (actual charge minus the shielding caused by inner shells: Z- eff)






40. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






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






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






43. Two or more atoms held together by covalent bonds






44. 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






45. 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






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






47. Process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated






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






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






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







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