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






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






3. An ionic compound that resists changes in its pH






4. Sol - a chemical process in which solvent molecules and molecules or ions of the solute combine to form a compound






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






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






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






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






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






10. 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






11. 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.






12. An atom or group of atoms that has a positive or negative charge






13. Common definition of acids as proton (H+) donors and bases as proton acceptors






14. Two or more atoms held together by covalent bonds






15. 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






16. A horizontal row of elements in the periodic table






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






18. 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






19. 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.






20. An atom - radical - or molecule that has gained or lost one or more electrons and has a negative or positive charge






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






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






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






24. (chemistry) p(otential of) H(ydrogen)






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

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






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






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






30. 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






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






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






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






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






35. 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






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






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






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. Spectrum of certain absorbed wavelengths of light corresponding to an atom's spectrum of emitted frequencies of light. Unique to each element. AAS can be used to indentify an element.






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






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






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






43. A pair of equal and opposite electric charges or magnetic poles separated by a small distance






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






45. 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






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






47. 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






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






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






50. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron - and all electrons in singly occupied orbitals must have the same spin

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