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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. 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.






2. A representation of a displacement reaction showing only the reactive species and omitting the spectator ions.






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






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






5. 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.






6. 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






7. The ways in which electrons are arranged in various orbitals around the nuclei of atoms






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






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






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






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






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






13. An elementary particle with 0 charge and mass about equal to a proton






14. 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






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






16. 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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17. Energy released when an atom or ion in the gaseous state gains an electron. Increases from left to right and from bottom to top on the Periodic Table.






18. 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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19. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance






20. 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






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






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






23. (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers






24. Chalcogens - - Oxide O






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






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






27. 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






28. Simplest whole # ration of atoms in a compound






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






30. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






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






32. The amount of energy that reactants must absorb before a chemical reaction will start; also called free energy of activation.






33. 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.






34. 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






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






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






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






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






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






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






41. 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






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

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43. The formation of one or more covalent bonds between an electron pair donor and an electron pair acceptor






44. Charge assigned to an atom in a molecule or polyatmic ion - calculated by (# valence electrons) - (# 1/2 bonding electrons) - (# nonbonding electrons). Molecules containing atoms with lower formal charges tend to be more stable than those with higher






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






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






47. 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






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






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. A base that can accept two moles of H+ per mole of itself (ex: SO4






Can you answer 50 questions in 15 minutes?



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