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Rach Grace

Rach G.

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Which of the following is the best container for gas during isothermal process? (a) Glass vessel (b) Wood vessel (c) Copper vessel (d) Thermos flask

Advanced Problems in Physical Chemistry for Competitive Examinations

Thermodynamics

Exercises I

Calculate the wavelength of (a) the sodium line at $589 \mathrm{~nm}$ in honey, which has a refractive index of $1.50$. (b) the output of a ruby laser at $694.3$ when it is passing through a piece of quartz, which has a refractive index of $1.55$.

Principles of Instrumental Analysis

If the temperature of an ideal gas increases from $300 \mathrm{~K}$ to $600 \mathrm{~K},$ what happens to the rms speed of the gas molecules?

If the temperature of an ideal gas increases from $300 \mathrm{~K}$ to $600 \mathrm{~K},$ what happens to the rms speed of the gas molecules?

College Physics

How much ethylene glycol $\left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\right)$ would you need to add to a 100 -mL sample of water to decrease the freezing point of water to the each temperature? (a) $-0.5^{\circ} \mathrm{C}$ (b) $-2.2^{\circ} \mathrm{C}$ (c) $-5.4^{\circ} \mathrm{C}$

How much ethylene glycol $\left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}_{2}\right)$ would you need to add to a 100 -mL sample of water to decrease the freezing point of water to the each temperature? (a) $-0.5^{\circ} \mathrm{C}$ (b) $-2.2^{\circ} \mathrm{C}$ (c) $-5.4^{\circ} \mathrm{C}$

Introductory Chemistry Essentials

Questions asked

ANSWERED

Oluwapelumi Kolawole verified

Numerade educator

Sodium sulfate is slowly added to 1.00 L of a solution that is 0.10 M in both ( mathrm{Pb}^{2+}(a q) ) and ( mathrm{Sr}^{2+}(a q) ). How much ( mathrm{Na}_{2} mathrm{SO}_{4} ) must be added to induce precipitation of ( mathrm{SrSO}_{4} ) ? The ( K_{ ext {sp }} ) of ( mathrm{PbSO}_{4} ) is ( 1.8 imes 10^{-8} ) and the ( K_{ ext {sp }} ) of ( mathrm{SrSO}_{4} ) is 3.5 ( imes 10^{-7} ). (A) ( 3.3 imes 10^{-6} mathrm{~mol} ) (B) ( 3.5 imes 10^{-6} mathrm{~mol} ) (C) ( 5.9 imes 10^{-4} mathrm{~mol} ) (D) ( 9.5 imes 10^{-2} mathrm{~mol} )

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INSTANT ANSWER

A gas has 235 mL volume when collected over water at 25°C and 698 mm Hg. What will be its volume when measured dry at standard conditions. The vapor pressure of water at this temperature is 23.8 mm Hg. A. 191 mL B. 197 mL C. 223 mL D. 265 mL

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David Collins verified

Numerade educator

EDTA forms strongly bonded complexes with many metal ions. Arrange the following ions: Ca?*, Cu?+, Fe3+, Mg?+ in order of decreasing minimum pH needed for satisfactory titration. 1. Ca?+ II. Cu2+ III. Fe3+ IV. Mg2+ A. IV, III, II, I B. III, II, I, IV C. I, II, III, IV D. II, III, IV, 1

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ANSWERED

Ankur S verified

Numerade educator

What is the wavelength of the sodium line at 589 nm in honey, which has a refractive index of 1.50? A 393 nm B. 400 nm C. 240 nm D. 545 nm

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Shalini Tyagi verified

Numerade educator

Which of the following has the lowest boiling point?

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ANSWERED

Rashmi Sinha verified

Numerade educator

94. Which of the following modes of the pentose phosphate pathway takes place when the cells need only ribose-5-P, a case for actively dividing cells? A. the reverse of the non-oxidative phase takes place B. the reverse of the oxidative phase takes place C. only the oxidative phase is active D. only the non-oxidative phase is active

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INSTANT ANSWER

Which of the following is NOT a function/characteristic of the H1 histone protein? A. It binds with the linker DNA to allow formation of a compact 30-m chromatin fiber. B. It acts as a stabilizer for the colling of the DNA to the histone core. C. It associates with the other histone proteins for added strength of the nucleosome. D. IT IS RICH IN BASIC AMINO ACIDS WHICH ALLOWS IT TO ASSOCIATE WELL WITH DNA MOLECUEL

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Jenny Wu verified

Numerade educator

An ice cube at an unknown temperature is added to 25.0 g of liquid H2O at 40.0 °C. The final temperature of the 29.3 g equilibrated mixture is 21.5 °C. What was the original temperature of the ice cube? [Cp (J/g•°C) water = 4.184, ice = 2.06, ∆H°fusion = 333 J/g] (A) –6.5 °C (B) –13.1 °C (C) –35.3 °C (D) –56.8 °C

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Yujie Wang verified

Numerade educator

A person shoots out a beam with 1.45 per micrometer wavenumber. If it travels through a medium that has a refractive index of 1.80, what is its wavenumber (per micrometer)?

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ANSWERED

Shalini Tyagi verified

Numerade educator

An aqueous solution of AgClaq) is in equilibrium with its precipitate at 298 K. If the ionic strength of the solution is increased, which of the following statements must be true? A) More AgCs dissolves since the Ksp of Agcl decreases with increasing ionic strength B) The activities of Ag* and Cl remain constant C) The activity coefficients of Ag+ and Clincrease D) The concentrations of Ag (aq) and Cl (aq) remain constant

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