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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. Product of the molar concentrations of dissociated ions in solution at saturation - where each ion is raised to the power of its stoichiometric coefficient. Denoted Ksp.






2. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






3. 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






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






5. 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






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






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






8. Property of the elements that can be predicted from the arrangement of the periodic table






9. 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






10. 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






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






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






13. 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.






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






15. A graph of pressure versus temperature that shows the conditions under which the phases of a substance exist






16. A structural formula in which electrons are represented by dots; dot pairs or dashes between two atomic symbols represent pairs in covalent bonds.






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






18. 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






19. Play- by- play showing the individual steps of a reaction - including the formation and destruction of any reaction intermediates that may occur.






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






21. 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






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






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






24. 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






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






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






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






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






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






30. Mixture of 2 or more substances that distills at a constant temperature and with constant composition - even though seperately the components have different boiling points






31. 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.






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






33. 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.






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






35. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






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






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






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






39. 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






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






41. 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






42. 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






43. 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






44. Expression of auto - ionization of water into H+ and OH- at a certain temperature - given by the product of the ions' molar concentrations. Denoted by Kw and equal to 10-






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






46. Chalcogens - - Oxide O






47. Halogens; ns2np5 - - 2nd most reactive group - The Halogens; very active because of need to fill; form -1 ions; 7 electrons in valence shell; tend to form salts with elements from groups 1A and 2A






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






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






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