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






2. 5 different orbitals shaped like clover leaves and max electrons is 10






3. 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.






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






5. 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






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






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






8. Two or more atoms held together by covalent bonds






9. Small discrete increments of energy.






10. A solution in which water is the solvent






11. 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






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






13. 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






14. 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






15. Simplest whole # ration of atoms in a compound






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






17. Having characteristics of both an acid and a base and capable of reacting as either






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






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






20. Defined acids as subtsances that produced H ions in water - while bases produced OH ions. When they reacted together - H and OH neutralise to make water






21. (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers






22. 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






23. 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






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






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






26. 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-






27. The weight in grams of compound that can be substituted by 1 atom of Hydrogen. GEW = MW / # of acidic Hyrdogens






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






29. 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






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






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






32. 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






33. 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






34. 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






35. 5 valence electrons -3 ions - Nitride N






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






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






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






39. A horizontal row of elements in the periodic table






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






41. 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






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






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






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






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






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






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






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






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






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