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How does plaque harm teeth? Explain in detail? How does fluoride promote dental health?
The following problem is based on the "Nutrition Facts" found on the wrapper of an energy bar, assuming a 2000 calorie diet. The energy bar contains 100 mg of sodium, which constitutes
A buffer contains 0.19 mol of propionic acid (C2H5COOH) and 0.22 mol of sodium propionate (C2H5COONA) in 1.20L. What is the pH of the buffer after the addition of 0.02 mol of HI
What are the concentrations of HSO4-, SO42-, and H+ in a 0.255 M KHSO4 solution? (Hint: H2SO4 is a strong acid; Ka for HSO4- = 1.3 10-2.)
A. Determine the pH at the equivalence point in the titration of 25.0 mL of 0.100 M NaOH, with .100 M HNO3. B. What Is the pH of the solution when 15 ml of acid has been added
Calculate the equilibrium concentration of Zn2+(aq) in a solution that is 0.0125 M Zn(NO3)2 and 0.600
A heliox deep-sea diving mixture contains 6.0% oxygen and 94.0% helium.What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 9.0
Compute the amount of heat needed to completely sublime 43.0 grams of solid dry ice at its sublimation temperature. (The heat of sublimation for carbon dioxide =32.3).
A student determined the molar mass of an unknown non-electrolyte compound by measuring the freezing point depression of an aqueous solution of the compound.
A certain human gene was shown to have only 80% of its DNA sequence identical to that of an ape, but its corresponding protein sequence has 95% identity
Problem- When 9.81 g of neon is combined in a 100 L container at 80oC with 10.62 g of argon, what is the mole fraction of argon. What is the coefficient for nitrogen in the formation reaction for ammonia
Which of the following organic halides will undergo an E2 elimination on heating with potassium hydroxide in ethanol? a. 2,2-dimethyl-1-bromopropane b. 2,2-dimethyl-1-bromocyclohexane c. benzyl chloride (C6H5CH2Cl)
A certain liquid has a vapor pressure of 92.0 Torr at 23.0 °C and 353.0 Torr at 45.0 °C. Calculate the value of ?H°vap for this liquid and calculate the normal boiling point of this liquid in °C.
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