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MCAT Chemistry

Subjects : mcat, science
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • 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. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






2. Simplest whole # ration of atoms in a compound






3. A horizontal row of elements in the periodic table






4. 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






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






6. 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






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






8. A set of frequencies of electromagnetic waves given off by atoms of an element; consists of a series of fine lines of individual colors






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






10. 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






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






12. 5 different orbitals shaped like clover leaves and max electrons is 10






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






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






15. 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






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






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






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






19. Chalcogens - - Oxide O






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






21. 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.






22. 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






23. 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






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






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






26. Alkali metals: highly reactive - therefore always compounds. - 1 valence electron +1 ion - Hydrogen H? - Lithium Li? - Sodium Na? - Potassium K? - Rubidium Rb? - Cesium Cs?






27. 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.






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






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






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






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






33. 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






34. 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.






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






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






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






38. 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






39. An emperimentally determined mathmatical expression showing the rate of a reaction as a function of the concentration of its reactants






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






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






42. The weak attractive forces between molecules resulting from the small - instantaneous dipoles that occur because of the varying positions of the electrons during their motion about nuclei






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






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






45. Numbers that specify the properties of atomic orbitals and of their electrons






46. An ionic compound that resists changes in its pH






47. The point during a titration when the number of H+ ions and OH- ions are equal. This is at the middle of the steepest part of the titration curve.






48. 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-






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






50. 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







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