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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 reaction where a compound does Not change its molecular structure.






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






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






4. 5 valence electrons -3 ions - Nitride N






5. (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance C>>>>A+B






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






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






8. 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.






9. 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.






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






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






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






13. 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






14. 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.






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






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






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






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






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






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






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






22. One - half of the distance between the center of identical atoms that are not bonded together. Since effective nuclear charge increases when moving from left to right each additional electron is pulled more strogly toward the nucleus.






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






24. 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.






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






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






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






28. An uncharged molecule with a single unpaitred electron in its outer ring - very unstable - exists for only about 10 seconds






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






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






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






32. Simplest whole # ration of atoms in a compound






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






34. 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






35. A horizontal row of elements in the periodic table






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






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






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






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






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






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






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






43. Sum of all the masses - in AMU - present in one molecule of a molecular compound.






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






45. Named after their cation and anion






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

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






48. 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






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






50. The area of chemistry that is concerned with reaction rates and reaction mechanisms