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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.
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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. 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.






2. 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






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






4. 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.






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






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






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






8. 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






9. Systematic pairing of a deprotonated species (base) with its protonated form (conjugate acid). Conjugates appear on opposite sides of a chemical equation.






10. 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.






11. 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






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






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






14. Region in a molecule where atomic orbitals overlap - resulting in either a stable low - energy bonding orbital or an unstable high - energy antibonding orbital.






15. 5 different orbitals shaped like clover leaves and max electrons is 10






16. 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






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






18. Slightly less reactive than alkali metals - comprise group II






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






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






21. Small discrete increments of energy.






22. 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






23. 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.






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






25. Large molecular structures - strong covalent bonding - share qualities of IONIC And COVALENT






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






27. 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.






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






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






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






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

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32. 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






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






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






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






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






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






39. The quantum number that has only two possible values - +1/2 and -1/2 - which indicate the two fundamental spin states of an electron in an orbital






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






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






42. 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






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






44. Chalcogens - - Oxide O






45. The percent by mass of each element in a compound






46. 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






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






48. Simplest whole # ration of atoms in a compound






49. 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






50. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Abbreviated as Z(eff). Increases from left to right - and bottom to top on the Periodic Table.