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1. Microorganisms on the surface of a tooth may produce acids. How might this lead to tooth decay?
2. Would one expect aerobic or anaerobic bacteria to enter into the gingiva once it is damaged by calculus? Explain your answer.
3. What genera of bacteria are frequently found in areas of gingivitis?
4. Briefly describe the process of horizontal disease transmission. Do you think dental disease can be horizontally transmitted? Explain your answer.
5. What is the length of the time needed for colonization of a clean tooth?
6. How does the ingestion of carbohydrates contribute to dental caries?
7. Describe necrotizing ulcerative gingivitis.
a tank with a volume of 1.00m3 is filled with air at 0 degrees to 20 times its atmospheric pressure. how much volume
Initally, only H2S is present at a pressure of 0.123 atm in a closed container. What is the total pressure in the container at equilibrium
Which of the following intermediates is believed to occur in the mechanism by which alkenes are hydrated in the presence of acid?
find the net ionic equation for BaCl2(aq) + NaOH(aq) --------->Ba(OH)2(?) +NaCl(aq) is the Ba(OH)2 a solid or aqueous in water? please first show the ionic equation then cancel out spectator ions just for clarity.
Write balanced equations for the combustion of methane, CH4(g) and octane C8H18 in air. The products are carbon dioxide and liquid water. Calculate the standard enthalpy for each equation called the heat of combustion.
When aqueous solutions of potassium acetate and hydrochloric acid are mixed, an aqueous solution of potassium chloride and acetic acid results. Write the net ionic equation for the reaction.
Explain what is the energy of the photon that is emitted when the state of an electron changes from n=4 to n=2, in a hydrogen atom. (R =3.29 x 1015 Hz)
Oxygen and sulfur combine to form a variety of different sulfur oxides. some are stable molecules and some, including S2O2 and S2O3
Calculate the specific heat of iron. Assume that the density of the water is 1.00 g/mL.
State the selection rule for infrared-active molecules. Also, give an example of a molecule that is IR-active and identify an IR-active bond in the molecule, as well as where one would find its transition what frequency
The managing director of a well-known company on Wall Street thrives on a diet of fruit jam, bread, pasta, and coffee. She exercises intermittently.
a mixture contains two compounds x and y. both compounds x y have a solubility 1 g100 ml of solvent at the temperature
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