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






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






3. An ionic compound that resists changes in its pH






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






5. Sum of the protons and neutrons in an element often denoted by the letter A






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






7. PH of a molecule at which it contains no net electric charge - isoelectric point.






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






9. 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.






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






11. The lowest allowable energy state of an atom






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






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






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






16. Standard Temperature and Pressure. 273 Kelvin (0 Celsius) - 1 atmosphere (760 torr - 760 kPA).






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






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






19. A model of acids and bases which an acid is hydrogen ion donor and base is a hydrogen ion acceptor.






20. Common definition of acids as proton (H+) donors and bases as proton acceptors






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






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






23. 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.






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






25. 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






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






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






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






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






30. At a constant pressure - the volume of an ideal gas is directly proportinal to its temperature: V (a) T

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






32. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






34. Theory stating that the rate of a reaction is directly proportional to the number of collisions that take place between reactants per second.






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






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






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






38. Chalcogens - - Oxide O






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






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






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






42. 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






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






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






45. The energy required to remove an electron from a gaseous atom; generally increases in moving from left - to - right across a period and decreases in moving down a group






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






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






48. Simplest whole # ration of atoms in a compound






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






50. A subatomic particle that has a positive charge and that is found in the nucleus of an atom Charge of +1 and mass of 1.0073 amu