Numerade

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Write the balanced equation for the reaction of sodium and chlorine gas.

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State the effect on the volume of 1 mol of an ideal gas when: The pressure is tripled (at constant T).

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Find $ \Delta \mathrm{H} $ for the following \[ \mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{CO}_{2(\mathrm{~g})}+2 \mathrm{H}_{2} \mathrm{O}_{2} \] Given : \[ \begin{array}{lll} \mathrm{C}_{\text {(graphite) }}+2 \mathrm{H}_{2(\mathrm{~g})} \rightarrow \mathrm{CH}_{4(\mathrm{~g})} & \Delta \mathrm{H}_{\mathrm{f}}=-74.6 \mathrm{~kJ} & \leftarrow \text { Reverse } \\ \mathrm{C}_{\text {(graphite) }}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{CO}_{2(\mathrm{~g})} & \Delta \mathrm{H}_{\mathrm{f}}=-393.5 \mathrm{~kJ} & \leftarrow \text { Keep } \\ \mathrm{H}_{2(\mathrm{~g})}+1 / 2 \mathrm{O}_{2(\mathrm{~g})} \rightarrow \mathrm{H}_{2} \mathrm{O}_{(\mathrm{II}} & \Delta \mathrm{H}_{\mathrm{f}}=-285.8 \mathrm{~kJ} & \leftarrow \mathrm{X} 2 \end{array} \]

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71. $M_N$, $f(x) = an x$ over $[rac{1}{2}, 1]$

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EXAMPLES: Assign the oxidation numbers of the atoms in the following compounds/ ions. a.) $ \mathrm{Al}_{2} \mathrm{O}_{3} $ b.) $ \mathrm{HCO}_{3}^{-} $

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The Romer model predicts that a decrease in population will: - increase the growth rate of ideas. - have an ambiguous effect on the growth rate of ideas. - decrease the growth rate of ideas. - have no effect on the growth rate of ideas. existing stock of ideas the depreciation rate

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In the long run, which of the following is correct? a. The number of jobs is fixed and redistributed between employers based on their wants. b. The number of jobs is determined by the amount of money spent by government on jobs programs. c. The number of jobs is determined by the number of people who want to work. d. The number of jobs is diminishing, which is why one famous economist said, “In the long run, we are all dead.”

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A helical gear has a normal pressure angle of 20°, a helix angle of 25° and a transverse diametral pitch of 0.24 teeth/mm and has 18 teeth. Find: 1. The pitch diameter. 2. The transverse, the normal, and the axial pitches. 3. The normal diametral pitch. 4. The transverse pressure angle.

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2. If the density of the material $\delta(x, y)$ is constant then the center of mass does not depend on the value of the density. Show/Explain why this is true. $\bar{x} = \frac{\iint_D x \, dA}{\iint_D 1 \, dA}$ and $\bar{y} = \frac{\iint_D y \, dA}{\iint_D 1 \, dA}$ The second observation is that $\iint_D 1 \, dA = \text{area}(D)$. The reason why this is true will be covered in class.

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Anoushka was playing basketball and her teammate's arm was blocking the ball in such a way that she could only see both sides of the basketball but not the middle. Anoushka knew the basketball was still whole because of size consistency, object consistency, object permanence, and object coherence.

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stephanie m.