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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. 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






2. 5 valence electrons -3 ions - Nitride N






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






4. The solubility of a gas in a liquid is directly proportional to the partial pressure of that gas on the surface of the liquid

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






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






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






8. The vapor pressure of solution is the product of the mole fraction of the solvent and the vapor pressure of the pure solvent. P_a=X_aP_total

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






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






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






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






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






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






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






16. 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






17. 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






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






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






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






21. 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.






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






23. 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






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






25. Attractive and repulsive forces between molecules that are weaker than forces within molecules.






26. Specifies the specific orbital in which the electron is most likely to be found. - Third quantum number - designated as ml. Describes a particular orbital within a subshell where an electron is very likely to be found. Possible values are integers in






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






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






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






30. 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






31. 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.






32. 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






33. 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.






34. An atom - ion - or molecule that donates an electron pair to form a covalent bond.






35. A covalent bond in which the bonding electrons are shared equally by the bonded atoms - resulting in a balanced distribution of electrical charge






36. 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.






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






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






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






40. Simplest whole # ration of atoms in a compound






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






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






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






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






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






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






47. The amount of energy that reactants must absorb before a chemical reaction will start; also called free energy of activation.






48. A solution in which water is the solvent






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






50. 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