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






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 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






4. 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.






5. Any sample of a given compound will contain the same elements in the identical mass ratio.






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






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






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






9. 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.






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






12. No two electrons or protons or neutrons in a given system can be in states characterized by the same set of quantum numbers






13. Small discrete increments of energy.






14. 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






15. E=hc/?






16. A horizontal row of elements in the periodic table






17. 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.






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. 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.






20. Attractions between molecules caused by the electron motion on one molecule affecting the electron motion on the other through electrical forces; these are the weakest interactions between molecules






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






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






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






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






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






26. 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






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






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






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






30. 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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31. The ratio of the actual yield to the theoretical yield for a chemical reaction expressed as a percentage; a measure of the efficiency of a reaction






32. Redox reaction - in which the same species is both oxidized and reduced.






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






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






35. 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






36. 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






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






38. 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






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






40. The tendency for an atom to attract electrons to itself when it is chemically combined with another element






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






42. Named after their cation and anion






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






44. 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






45. 4 valence electrons +4 - -4 ions. - Carbon Group can form covalent bonds with nonmetals. Only carbon forms strong pi bonds






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






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






48. 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






49. A solution in which water is the solvent






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







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