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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. 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






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






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


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






5. Small discrete increments of energy.






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






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






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






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






10. 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






11. Named after their cation and anion






12. Any sample of a given compound will contain the same elements in the identical mass ratio.






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






14. (chemistry) p(otential of) H(ydrogen)






15. 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.






16. One - half the distance between the nuclei of two atoms of the same element when the atoms are joined






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






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






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






20. 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.






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






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






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






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






25. An ionic compound that resists changes in its pH






26. Two or more atoms held together by covalent bonds






27. E=hc/?






28. 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.






29. Have three valance electrons. In certain instances - some elements will loose three electrons - but they will also share electrons with another element to attain stability.






30. 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


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






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






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






34. 5 valence electrons -3 ions - Nitride N






35. 1913 - Niels Bohr - said that electrons formed specific layers instead or random ones - said atoms atoms absorb and give off energy when the electrons move from one shell to another






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






37. Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas - usually eight valence electrons






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






39. Sol - a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound






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






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






42. 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






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






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






45. 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.






46. 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






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






48. 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






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






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