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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. 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.






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






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






4. The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another






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






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






7. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.






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






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






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






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






12. 5 valence electrons -3 ions - Nitride N






13. 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






14. 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.






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






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






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






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






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






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






22. A substance that - when dissolved in water - results in a solution that can conduct electricity






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






24. A solution in which water is the solvent






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






26. A naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers






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






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






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






30. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






31. A horizontal row of elements in the periodic table






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






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






34. An atom or group of atoms that has a positive or negative charge






35. The sum of the exponents in a rate law - where each exponent provides the reaction order with respect to its reactants






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






37. The weak attractive forces between molecules resulting from the small - instantaneous dipoles that occur because of the varying positions of the electrons during their motion about nuclei






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






39. 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.






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






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






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






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






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






45. Keq describes the ratio of product concentration to reactant concentration - with each raised to the power corresponding ot its coefficient ion in the balanced equation






46. 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






47. An element in an 'A' group in the periodic table; as a group these elements display a wide range of physical and chemical properties. In their atoms - the s and p sublevels in the highest occupied energy level are partially filled






48. 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.






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






50. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers