Numerade

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Which represents an enthalpy change at 25 °C and 1 atm that is equal to $$\Delta H_f^\circ$$ for $$H_2O(l)$$? $$2H_2O(l) \rightarrow O_2(g) + 2H_2(g)$$ $$1/2 O_2(g) + H(g) \rightarrow H_2O(g)$$ $$1/2 H_2(g) + 1/2 O_2(g) \rightarrow H_2O(l)$$ $$H_2O(l) \rightarrow 1/2 O_2(g) + 1/2 H_2(g)$$ $$O_2(g) + 2H_2(g) \rightarrow 2H_2O(l)$$

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Why do most astronomers and physicists believe wormholes are unlikely to be useful for intergalactic travel? They are forbidden by general relativity. Wormholes collapse on very short timescales -- faster than light can cross. Wormholes produce negative energy matter. Travellers will be eaten by the spaceworms.

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5 True or False 1 point Temperament is primarily learned. True False

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2. If the amplitude (loudness) of the sound provided to your resonance tube was doubled, what would happen to the wavelength?

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Explain why these trends occur in terms of atomic structure (i.e., number of energy levels, nuclear charge).

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How many cubic centimeters are in $21 \text{ mm}^3$?

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Show the reaction mechanisms of 4 reactions: 1. Protonation of 3-nitroaniline 2. Deprotonation of anilinium ion 3. Deprotonation of benzoic acid 4. Protonation of benzoate ion

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Question 2 Which of the following items is a key feature of textual analyses? O a situation that needs to be resolved O a well-defined problem O a clear interpretation or judgment O a questioning, speculative tone 1 pts

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Consider the following data. $C_2H_2(g) \implies 2C(s) + H_2(g)$ $\Delta H = -226.8 kJ$ $CO_2(g) \implies C(s) + O_2(g)$ $\Delta H = +393.5 kJ$ $2H_2O(l) \implies 2H_2(g) + O_2(g)$ $\Delta H = +571.7 kJ$ Use Hess's law to calculate $\Delta H$ for the reaction below. $\Delta H = \boxed{} kJ$ $4CO_2(g) + 2H_2O(l) \implies 2C_2H_2(g) + 5O_2(g)$

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Given the rational function $f(x) = \frac{8x^2 - 5x - 27}{x^3 - 2x^2 - 5x + 6}$ a) Find the roots a, b and c of the denominator (write them in increasing order) a = b = c = b) Find the coefficients A, B and C in the decomposition in partial fractions: $f(x) = \frac{A}{x - a} + \frac{B}{x - b} + \frac{C}{x - c}$ A = B = C = b) Evaluate $\int \frac{8x^2 - 5x - 27}{x^3 - 2x^2 - 5x + 6} dx$ + C

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sherri w.