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






2. 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






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






4. E=hc/?






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






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

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






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






9. 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






10. 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






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






12. 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






13. 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.






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






15. Two or more atoms held together by covalent bonds






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






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






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






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






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






21. Valence Shell Electron Pair Repulsion theory - stating that the three - dimensional molecular geometry about some central atom is determined by the elctronic repulsion between its bonding and nonbonding electron pairs.






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






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






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






25. The amount of product that can be made in a chemical reaction based on the amount of limiting reactant






26. An acid that will completely dissociate in aqueous solution - like HCl - HI - HClO4 HBr.






27. 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






28. When a solute is dissolved in a solvent - it will dissociate until reaching an equilibrium point at which the rate of dissociation equals the rate of precipitation of the solute - regardless of any additional solute introduced into the mixture






29. 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.






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






31. Contains nonmetals - 7 valence electrons in it's outermost energy level. Very reactive






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






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






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






35. Named after their cation and anion






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






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






38. 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






39. 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






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






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






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






43. A dynamic condition in which two opposing changes occur at equal rates in a closed system






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






45. States that if a stress is applied to a system at equilibrium - the system shifts in the direction that relieves the stress.






46. An ionic compound that resists changes in its pH






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






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






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






50. 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