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






2. 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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3. 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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4. 5 valence electrons -3 ions - Nitride N






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






6. 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.






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






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






9. 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.






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






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






12. Tells you how much solute is present compared to the amount of solvent






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






14. The reaction of the ions that characterize acids and the ions that characterize bases to form water molecules and a salt






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






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






17. Property of the elements that can be predicted from the arrangement of the periodic table






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






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






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






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






22. When dipoles are dissolved in a solution where ions are present ions wil arrange themselves with the opposite charged end of the dipole.






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






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






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






26. 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.






27. The hypothetical equation showing only the species that is oxidized or reduced in a redox reaction and the correct number of electrons transferred between the species in the complete - balanced equation.






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






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






30. 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






31. The weight in grams of one mole of a given elementand is expressedin tems of grams per mole.






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






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






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






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






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






37. 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






38. A subdivision of an energy level in an atom. They are divided into orbitals.






39. Two or more atoms held together by covalent bonds






40. A set of spectral lines that appear in the visible light region when a hydrogen atom undergoes a transition from energy levels n>2 to n=2.






41. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






42. Simplest whole # ration of atoms in a compound






43. The molar solubility of one salt is reduced when another salt - having a common ion is brought into the same solution






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






45. 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






46. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






47. 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






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






49. Structure that occurs when it is possible to draw two or more valid electron dot structures that have the same number of electron pairs for a molecule or ion






50. The process by which a gas escapes from one container to another at lower pressure through a tiny hole in the container.







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