One deciliter of a .9% nickel (II) nitrate solution is diluted to a volume of 500 mL. Calculate the final [NO3-] of the resultant solution. Answer in M please.
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Consider the methanol(1) + ethanol(2) system at 101.325 kPa. Using Raoult's Law, predict the system temperature and vapor-phase composition for this mixture.
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1) The data below apply to the formation of urea (NH2CONH2) from ammonium cyanate (NH4CNO). Initially, 22.9 grams of ammonium cyanate was dissolved in enough water to prepare 1.00 L solution. The reaction is NH4CNO----> NH2CONH2. Time (minutes) 0, 20.0, 50.0, 65.0, 150.0
Mass of urea formed (grams) 0, 7.0, 12.1,13.8, 17.7
From this data and using Excel, (a) determine the order of the reaction, (b) determine the rate constant (along with units), and (c) determine the mass of ammonium cyanate left after 300 minutes.
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Discuss effects of structure and of the medium on the strengths of acids and bases. Use examples to illustrate your explanation.
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You may have heard that ice skaters actually skate on a thin layer of water rather than solid ice (which reduces friction on the blade and allows them to skate faster). Let’s work through a calculation to determine if this statement is reasonable. Estimate the pressure exerted by a 200-lb hockey player, standing on two blades that are 0.1 mm x 20 cm. Calculate the melting point of ice below the player, assuming that the density of ice under these conditions is approximately 0.915 g cm–3 and that of liquid water is 0.998 g cm–3. Assuming a typical temperature of ice in a skating rink is 27 °F, does a hockey player skate on ice or water?
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Write the half reaction for the anode and cathode for the following electrochemical cells. which metal acts as the anode and which acts as the cathode. For each cell, combine the half reactions and write the overall cell reaction.
a. Zn/Cu
b. Fe/Cu
c. Mg/Cu
d. Pb/Cu
e. Sn/Cu
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A solution contains 8.28×10-3 M magnesium nitrate and 1.47×10-2 M calcium acetate. Solid ammonium fluoride is added slowly to this mixture. What is the concentration of calcium ion when magnesium ion begins to precipitate?
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The volume of a sample of pure HCl gas was 277 mL at 20°C and 189 mmHg. It was completely dissolved in about 70 mL of water and titrated with an NaOH solution; 16.5 mL of the NaOH solution was required to neutralize the HCl. Calculate the molarity of the NaOH solution.
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How much CO2 ir released (in pounds) per year of your normal driving? comment on the size of your answer. CO2 is a greenhouse gas) how cound you reduce "carbon footprint'.
- Assume gasoline is mostly octane
- how many miles do you drive per week or per month
- how many miles per year?
- Gas mileage of your car> (# miles per gallon of gas)
- stoichiometry of the reaction
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can somebdy clearly explain me carbon dating?
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Balance the half-reactions assuming that they occur in acidic solution.
H2O2(aq)?H2O(l)
Zn(s)?Zn^2+(aq)
Ti^3+(aq)?TiO2(s)
Mn(s)?Mn^2+(aq)
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For the following reaction, the concentration of A and the amount of time required to decrease that concentration to one-half of the initial concentration, t1/2, are directly proportional. Therefore, a decrease in concentration of A shows a proportional decrease in the half life, t1/2. What is the order of this reaction? If the rate constant for this reaction is 0.0355 M·s–1 at 400 °C, what is the half-life of this reaction, given an initial concentration of 0.569 M.
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If you know that a sample of KI in water has a freezing point of -3.2C, what is the mass % of KI? What is the mole fraction of KI?
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Define the terms accuracy and precision. Give examples which illustrate the difference between terms.
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