Numerade

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A buffer is prepared with $Na_2CO_3$ and $NaHCO_3$. What is the correct net ionic equation describing what happens when a small amount of $NaOH$ is added to the buffer? $HCO_3^-(aq) + H_3O^+(aq) \rightleftharpoons H_2CO_3(aq) + H_2O(l)$ $HCO_3^-(aq) + OH^-(aq) \rightleftharpoons CO_3^{2-}(aq) + H_2O(l)$ $HCO_3^-(aq) + H_2O(l) \rightleftharpoons H_2CO_3(aq) + H_3O^+(aq)$ $H_2CO_3(aq) + OH^-(aq) \rightleftharpoons HCO_3^-(aq) + H_2O(l)$

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Two 2.0-cmcm-diameter disks spaced 1.6 mmmm apart form a parallel-plate capacitor. The electric field between the disks is 4.9×105 V/mV/m. What is the voltage across the capacitor?

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Sequence 1: On a piece of paper, draw the structures for the organic products that belong in each empty box of the reaction sequence below. You will upload your answer in Q18. + KMnO$_4$, HO$^-$ heat H heat Br$_2$ CH$_2$Cl$_2$ 1. NaBH$_4$, ether 2. H$^+$, H$_2$O

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Dividend yield is computed as the proportion of dividend per share to A) book value per share B) earnings per share C) market value per share D) share price

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An SUV is traveling east at 45 mph and Bettle (Volkswagen) is traveling north at 15 mph. Both enter an intersection and collide, causing both vehicles to slide north-east. Determine the velocities of the vehicles after impact. The SUV and Bettle weight 5000 lb and 2000 lb, respectively. Use the conservation of momentum and the definition of momentum

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What are the two grapes varieties used in making red Burgundy wine?

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In the chapter, "Negative Global Flows...", food imports and exports have increased that contain ingredients from around the world. O True O False

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Problem 5. $X_1, X_2, \dots, X_n$ are iid $Gam(5, \lambda)$. (a). Take $\hat{\lambda} = \frac{c}{\bar{X}}$. Find the constant $c$ to make $\hat{\lambda}$ an unbiased estimate of $\lambda$. (b). Compute the MSE of the unbiased estimator $\hat{\lambda}$ in (a). [hint: use the fact $\sum_{i=1}^n X_i \sim Gam(n\alpha, \lambda)$ if $X_1, \dots, X_n$ are iid $Gam(\alpha, \lambda)$].

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89. A heat source supplies 2325 kJ/kg to a working substance in a closed thermodynamics power cycle. The sink receives 1510 kJ/kg of working substance. The system pump requires 14 kJ/kg of substance pumped. What is the net work of the cycle? A. 815 kJ/kg B. 900 kJ/kg C. 120 kJ/kg D. 114 kJ/kg

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Two cyclists, 54 mi apart, start riding towards each other at the same time. One cycles twice as fast as the other. If they meet 2 hr later, at what average speed is each cyclist traveling?

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laura f.