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






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






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






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






5. 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.






6. A definite stable energy that a physical system can have






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






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






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






10. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12






11. Small discrete increments of energy.






12. 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.






13. 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.






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






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






16. 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






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






18. The quantum number that indicates the main energy level occupied by the electron. Can theoretically take on any positive interger. Denoted by the letter n.






19. 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






20. 5 valence electrons -3 ions - Nitride N






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






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






23. 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.






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






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






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






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






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






29. 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






30. Contains nonmetals that are non - reactive. Full outermost energy level except helium which has 2.






31. 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






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






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






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






35. Spectrum of certain absorbed wavelengths of light corresponding to an atom's spectrum of emitted frequencies of light. Unique to each element. AAS can be used to indentify an element.






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






37. The slowest elementary step which is the limit for the rate of the other steps






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






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






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






41. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






43. 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.






44. 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






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






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






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






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






49. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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