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A voltaic cell consists of a Zn/Zn2+(aq) half-cell and a Ni/Ni2+(aq) half-cell at 25 ◦C. The initial concentrations of Ni2+ and Zn2+ are 1.50 mol L−1 and 0.100 mol L−1 , respectively. (a) What is the electromotive force of the cell in the initial condition? (b) What is the cell potential when the concentration of Ni2+ has fallen to 0.50 mol L −1 ? (c) What are the concentrations of Ni2+ and Zn2+ when the cell potential falls to 0.45 V?

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Exercice 3 (2 points): Le carbone 14 se désintègre avec un taux proportionnel à la quantité présente à chaque instant et sa demi-vie est égale à 5730 ans. Si actuellement, la quantité présente est de 50 grammes, quelle est la quantité qui restera dans 10 000 ans ?

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HA 3.34 mg sample of a compound containing carbon, hydrogen, and oxygen underwent combustion producing 7.58 mg of CO2 and 3.10 mg of H2O. What is the empirical formula of the compound? (Type your answer using the format CxHyOz for the compound CxHyOz) HopHelpC2H3O (b) A compound is composed of elements C, H, and N. A 12.600-mg sample of the unknown compound was combusted, producing 34.181 mg of CO2 and 9.799 mg of H2O. What is the empirical formula for this compound? (Type your answer using the format CxHyNz for the compound CxHyNz) HopHelpC2H3N If the compound has a molar mass of 160 ± 5 g/mol, what is its molecular formula?

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Question 5 [4.4. Fundamental Concepts: Model Search] All 3 stepwise regression approaches (Forward, Backward, Forward-Backward) always select the same model. O True O False 2 pts Question 6 2 pts [4.6. Regularized Regression: Penalties] The prediction risk is the sum of the irreducible error and the mean square error, where only the latter can be controlled. O True O False Question 7 2 pts [4.6. Regularized Regression: Penalties] In regularized regression, the bigger lambda is, the larger the penalty for model complexity. O True O False Question 8 2 pts [4.6. Regularized Regression: Penalties] L1 (LASSO) and L2 (Ridge) can both be used for variable selection. O True O False Question 9 2 pts [4.7. Regularized Regression: Approaches] In Ridge Regression, if lambda is 0, the fitted regression has low bias but high variability. If lambda converges to infinity, the fitted regression has high bias but low variability. O True O False Question 10 [4.7. Regularized Regression: Approaches] If there is a group of variables among which the correlation is very high, LASSO selects one variable from that group. O True O False 2 pts

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• There are two uniform line charges of density $\rho_1 = +4nC/m$ at y=4, z=5, the second line charge $\rho_1 = -4nC/m$ at x=1, z=5, Find E at (1,2,3) m.

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1. A valve has a stem movement at full travel of 30 mm and has a linear plug which has a minimum flow rate of 0 and a maximum flow rate of 20 mVs. What will be the flow rate when the stem movement is 15 mm?

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Identify the type of conic represented, and convert the equation to rectangular form.\\ r = \frac{3}{6 + \cos \theta}\\ Identify the type of conic represented.\\ parabola\\ellipse\\hyperbola\\Convert the equation to rectangular form.\\ \boxed{\hspace{1cm}} = 0\\(Simplify your answer.)

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Entered 4*sin(a*t)-5*sin(a*t) Answer Preview Result 4 sin(at) - 5 sin(at) incorrect The answer above is NOT correct. Find the Laplace transform of 4 sin(at) - 5 sinh(at):

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This Question: 1 pt 3 of 10 (0 complete) the tonowing is a summary onionmanon presented on the inancial statements on a com??n? on December 31, 2019. Account 2019 2018 Net Sales Revenue $605,000 $500,000 Cost of Goods Sold 457,000 406,000 Gross Profit $148,000 $94,000 Selling Expenses 53,000 54,000 Net Income Before Income Tax Expense $95,000 $40,000 Income Tax Expense 40,000 20,000 Net Income $55,000 $20,000 (Round your answer to two decimal places.) With respect to net income, a horizontal analysis reveals A. that net income is 17.5% of net sales revenue B. a 175% decrease in net income C. a $20,000 increase in net income D. a 175% increase in net income This Quia

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Determine all bus voltages and power flows for the following three-bus power system: 200 km 51.0 150 km 150 km V = 1.00 pu P = 20 p V = 1.05 pu Three buses, npv = 1, npo = 1, ordered PV first, then P

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