Explain (very briefly) why if possible. Thanks guys! 1. An experiment was made o

Question

Explain (very briefly) why if possible. Thanks guys!

1. An experiment was made of the effect of temperature on the volume of 5.00 g of Hydrogen (H2) gas, with pressure held constant at I atm. Which property is the dependent variable? a. Temperature b. Volume c. Pressure d. Mass 2. At freezing point pure liquid can be in equilibrium with a. Pure solid b. Impure liquid c. Impure solid d. Pure liquid 3. Which of the following is polyprotic acid? a. Chloroacetic acid (CICH2COOH) b. Hydrobromic acid (HBr) c. Oxalic acid (H2C204) d. Acetic acid (CH3COOH) at only one temperature. 4. A student determined the following percent transmittances for a 0.5 M chromium ion solution using a Spectronic 20 spectrophotometer. Which wavelength has the greatest absorbance? a. Wavelength = 625; Percent transmittance (%T) = 6.92 b. Wavelength = 600; Percent transmittance (%T) = 3.91 c. Wavelength = 575; Percent transmittance (%T) = 4.05

Explanation / Answer

Answers-

1. Volume   - As said in the question, pressure and mass are constants and experiment is conducted to study the effect of 'temperature' on the 'volume'. So temperature is changed and resultant volume is calculated/observed.

2. Pure Solid - Because at freezing point the chemical potentials of both the liquid and the solid phases are equal and they (pure liquid and it's solid form) have the tendency to coexist.

3. Oxalic acid - Polyprotic acids are the acids which can loose more than one proton per molecule. Only the hydrogen atoms attached to oxygen atoms can come off as protons and not the ones attached to carbon atoms.

4. Wavelength = 600 and percent transmittance (%T) = 3.91   -   Less transmittance means more absorbance.

Hope that helps.

Regards-

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