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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. 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






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






3. Chalcogens - - Oxide O






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






5. Tells you how much solute is present compared to the amount of solvent






6. Second quantum number - designated by the letter 'l.' This 'angular momentum' refers to the subshells within each principle quantum energy level. It can take on the value of an integer in the 0 to (n -1) range. The four subshellscorresponding to l=0






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






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






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






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






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






12. States that it is impossible to determine simultaneously both the position and momentum of an electron or any other particle






13. 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






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






15. Side - to side parallel orbitals overlap to share electrons - the 2nd/3rd covalent bond between two atoms - cannot rotate and maintain the bond.






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






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






18. 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






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






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






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






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






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

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






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






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






27. The center of the atom which contains the protons and neutrons; in cells - structure that contains the cell's genetic material (DNA) and controls the cell's activities






28. 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






29. 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.






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






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






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






33. 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






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






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






36. A substance that - when dissolved in water - results in a solution that can conduct electricity






37. 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






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






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






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






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






42. A horizontal row of elements in the periodic table






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






44. The energy required to break a chemical bond and form neutral isolated atoms






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






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






47. The ratio of the number of moles of solute dissolved in one kilogram of solvent. molality (M = moles solute/kg of solution)






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






49. The amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon -12






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