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






2. 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.






3. 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.






4. Chalcogens - - Oxide O






5. The average distance between the nuclei of two bonded atoms






6. The lowest allowable energy state of an atom






7. 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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8. A concentration unit of a solution expressed as moles of solute dissolved per liter of solution






9. Alkaline Earth Metals - 2 valence electrons +2 ions - Magnesium Mg






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

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11. A solution in which water is the solvent






12. Attractive and repulsive forces between molecules that are weaker than forces within molecules.






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






14. 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






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






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






17. 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






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






19. 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






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






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






22. The energy required to break a chemical bond and form neutral isolated atoms






23. A pair of equal and opposite electric charges or magnetic poles separated by a small distance






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






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






26. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






27. Attractions between molecules caused by the electron motion on one molecule affecting the electron motion on the other through electrical forces; these are the weakest interactions between molecules






28. 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






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






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






31. Simplest whole # ration of atoms in a compound






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






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






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






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






36. 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






37. 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.






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






39. 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.






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






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

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42. Acids defined as electron - pair acceptors and bases as electron - pair donors.






43. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.






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






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. 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






47. Numbers that specify the properties of atomic orbitals and of their electrons






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






49. A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains to electron to form a negative ion






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