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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. 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






2. 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






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






4. Chalcogens - - Oxide O






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






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






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






8. The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule






9. 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






10. 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.






11. (chemistry) the sum of the relative atomic masses of the constituent atoms of a molecule






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






13. Second quantum number - designated by the letter 'l.' This 'angular momentum' refers to the subshells within each principle quantum energy level. It can take on the value of an integer in the 0 to (n -1) range. The four subshellscorresponding to l=0






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






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






16. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






17. A solution in which water is the solvent






18. PH of a molecule at which it contains no net electric charge - isoelectric point.






19. 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






20. 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.






21. The intermolecular force in which a hydrogen atom that is bonded to a highly electronegative atom is attracted to an unshared pair of electrons of an electronegative atom in a nearby molecule






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






23. 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






24. 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






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






26. A bond formed when two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei






27. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






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






29. Substance in which a solute is dissolved to form a solution






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






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






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






33. The number of atoms in exactly 12 g of pure 12c and equal to 6.022 x 10^23 is called






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






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






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






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






38. The area of chemistry that is concerned with reaction rates and reaction mechanisms






39. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






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






41. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron - and all electrons in singly occupied orbitals must have the same spin

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42. 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.






43. A fundamental constant - h - that relates the energy of light quanta to their frequency: h = 6.6 X 10^-34 joule

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44. When polar molecules orient themselves such that the positive region of one molecule is close to the negative region of another molecule.






45. The maximum amount of product that can be produced from a given amount of reactant






46. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu






47. Gram equivalent weight of solute per liter of solution - often denoted by N.






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






49. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






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







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