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AP Chemistry

Subjects : science, ap, chemistry
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. Electron pairs found in the space between the atoms






2. STP






3. (# of valence e- on free atom) - (# of valence e- assigned to atom in molecule)






4. When two elements form a series of compounds - the ratios of the masses of the second element that combine with 1g of the first element can always be reduced to whole numbers






5. When n=6 ->2 - color=






6. (organics) one carbon






7. CrO4²?






8. Variable for spin of electron (+.5 or -.5)






9. Variable for energy of e- - goes from 1 -2 -3 on up






10. Type of system in which the energy and mass may leave or enter






11. In going from a particular set of reactants to a particular set of products - the change in enthalpy is the same whether the reaction takes place in one step or in a series of steps

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12. A weak acid that changes color at or near the equivalence point






13. Involves quantum numbers






14. If K<1 - then Gº>0 and reaction will be...at chemical equilibrium






15. Instrument used to measure the pressure of atmospheric gas






16. Calculation from K to C






17. Unit of electrical potential; J/C






18. An element with several different forms - each with different properties (i.e. graphite & diamond)






19. For significant digits - trailing zeros _____ significant






20. Effusion of a gas is inversely proportional to the square root of the molar mass

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21. Expresses how the concentrations depend on time






22. 101 -325 Pa






23. % yield






24. Generally insoluble anions (names)






25. Formula used when diluting stock solution (to find amount of water or stock needed)






26. Delta H (AH) = ?






27. A homogeneous mixture with 1 phase






28. Like dissolves...






29. Elements which have all electrons paired and relatively unaffected by magnetic fields






30. AX4E






31. R=






32. Neutralization Reaction (general format) (net ionic of which is always (H+) + (OH-) --> (H2O))






33. This MUST be determined experimentally






34. Variable for type of orbital






35. 1 sigma bond - 2 pi bonds






36. 120° - sp^2






37. Reverse rxn occurs when






38. Similar to atomic orbitals - except between molecules






39. Energy required for liquid?gas






40. Energy can't be created nor destroyed






41. Group 1 - Ammonium - Nitrates - Acetates - Sulfates - Halides






42. Energy (definition)






43. Wavelength symbol






44. CN¹?






45. If Q<Ksp






46. Where oxidation occurs






47. frequency symbol






48. ClO4¹?






49. AH of formation for a substance in its stablest form (how it is found in nature)






50. 6.022x10^23