Numerade

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Aparna Shakti

Numerade educator

Match the following descriptions of titration curves with the diagrams: (a) strong acid added to strong base, (b) strong base added to weak acid, (c) strong base added to strong acid, (d) strong base added to polyprotic acid. [Section 17.3]

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Taimoor Shabbir

Numerade educator

Which of the following are redox reactions? For those that are, indicate which element is oxidized and which is reduced. For those that are not, indicate whether they are precipitation or neutralization reactions.\begin{equation} \begin{array}{c}{\text { (a) } \mathrm{P}_{4}(s)+10 \mathrm{HClO}(a q)+6 \mathrm{H}_{2} \mathrm{O}(l) \longrightarrow} \\ \quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad{\quad 4 \mathrm{H}_{3} \mathrm{PO}_{4}(a q)+10 \mathrm{HCl}(a q)}\end{array} \end{equation} \begin{equation} \begin{array}{l}\quad\quad\quad\quad\quad\quad{\text { (b) } \mathrm{Br}_{2}(l)+2 \mathrm{K}(s) \longrightarrow 2 \mathrm{KBr}(s)} \\\quad\quad\quad\quad\quad\quad {\text { (c) } \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}(l)+3 \mathrm{O}_{2}(g) \longrightarrow 3 \mathrm{H}_{2} \mathrm{O}(l)+2 \mathrm{CO}_{2}(g)}\end{array} \end{equation} \begin{equation} \begin{array}{r}\quad\quad\quad\quad{\text { (d) } \mathrm{ZnCl}_{2}(a q)+2 \mathrm{NaOH}(a q) \longrightarrow \mathrm{Zn}(\mathrm{OH})_{2}(s)+} \\ {2 \mathrm{NaCl}(a q)}\end{array} \end{equation}

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INSTANT ANSWER

In Exercises $17-20,$ use the Law of Detachment to determine what you can conclude from the given information, if possible. If a quadrilateral is a square, then it has four right angles. Quadrilateral QRSThas four right angles.

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Stephen Ho

Numerade educator

Is collision frequency the only factor affecting rate? Explain.

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Umar Sohail Qureshi

Numerade educator

($a$) Show that the flow speed measured by a venturi meter (see Fig. 10$-$29) is given by the relation $$v_1 = A_2\sqrt {\frac {2(P_1 - P_2)} {\rho(A_1^2 - A^2_2)}}.$$ ($b$) A venturi meter is measuring the flow of water; it has a main diameter of 3.5 cm tapering down to a throat diameter of 1.0 cm. If the pressure difference is measured to be 18 mm-Hg, what is the speed of the water entering the venturi throat?

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David Mccaslin

Numerade educator

Match the points labeled on the curve in Figure 2.8 with the given slopes. $$\begin{array}{r|r} \hline \text { Slope } & \text { Point } \\ \hline-3 & \\ \hline-1 & \\ \hline 0 & \\ \hline 1 / 2 & \\ \hline 1 & \\ \hline 2 & \\ \hline F\end{array}$$ (FIGURE CANNOT COPY)

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INSTANT ANSWER

Can a square matrix with two identical columns be invertible? Why or why not?

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INSTANT ANSWER

Two compounds are isomers if they have the same chemical formula but different arrangements of atoms. Use Table 8.3 to estimate $\Delta H$ for each of the following gas-phase isomerization reactions and indicate which isomer has the lower enthalpy.

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Umar Sohail Qureshi

Numerade educator

A person pulls horizontally on block $B$ in Fig. E4.28, causing both blocks to move together as a unit. While this system is moving, make a carefully labeled free-body diagram of block $A$ if (a) the table is friction less and (b) there is friction between block $B$ and the table and the pull is equal to the friction force on block $B$ due to the table.

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INSTANT ANSWER

The average number of children a Japanese woman has in her lifetime is 1.37. Suppose that one Japanese woman is randomly chosen. a. In words, define the random variable X. b. List the values that X may take on. c. Give the distribution of $X, X \sim$ _____(_____,_____) d. Find the probability that she has no children. e. Find the probability that she has fewer children than the Japanese average. f. Find the probability that she has more children than the Japanese average.

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Alicia K.