Other Chemistry Answers

A sample of helium gas effuses at a rate of 12m/sec. Another gas effuses at a rate of 6.0m/sec. What is the molar mass of the unknown gas?

If a balloon is filled with He, Ne, and Ar gases at a total pressure of 2.0atm, what is the partial pressure of argon if the partial pressures of helium and neon are both 0.25atm each?

Hi,May I please ask “What is the distinction between a bond dipole and a molecule dipole moment”?
Words to choose:Asymmetric,equal,monatomic,molecular dipole moment,bond dipole,symmetric,unequal , triatomic,diatomic.

A bond dipole is the _____ charge distribution between two bonded atoms with ______ electronegativities. A molecular dipole moment is the three-dimensional sum of all the bond dipoles in a molecule. (A ______is a measurable physical property; a ______is not measurable, unless the molecule is ______ .)

Thanks.

Hi,May I please ask the molecule difluoromethane(CH2F2) which is used as a refrigerant called R-32:
1)Based on the structure,how many electron domains surround the C atom in the molecule?
2)Would the molecule have nonzero dipole moments?yes/no
Thanks

Please predict the bond angles about the central atom in:
Words to choose:bent,trigonometry planar,tetrahedral,trigonal bipyramidal,octahedral,0 non bonding pairs,1 non bonding pairs,2 non bonding pairs,109,5 degrees,120 degrees,180 degrees.Thanks
1)H2S:______ electron-domain geometry with______on S will cause the bond angle to deviate from ideal ________ angles.

2)BCl3:______electron-domain geometry with ______on B .We confidently predict_____angles.

3)CH3I:______electrin-domain geometry with ____on C.Because the bonding electron domains are not exactly the same,we predict some deviation fro ideal _____ angles.

4)CBr4:____Electron-domain geometry with_____on C.We confidently predict _____angles.
5)TeBr4:_____electron-domain geometry with_____on Te will cause the bond angles to deviate from ideal values.

A 0.10M solution of NaOH ,is used to titrate 10.00ml of 0.10M CH3COOH.
Calculate the pH at equivalence point (3mks)
b) Sketch the titration curve in (a) above. (2mks)
c) Consider the titration of 25mL of 0.1M KCI with 0.050M AgNO3 using the Mohr method and given Ksp (AgCl) = 1.8 xl 0-10

Name the indicator used for the Mohr method. (1mk)
Use equations to explain how the end point is detected using this indicator. (2mks)

What is mirepoix in homescience

a) (i) Use EDTA structure to describe hexadentate chelating agent (2mks) (ii) State four types of EDTA titrations (2mks) b)ii)Consider the titration of 50mL Mg 2+ sample in a pH = 10.00 buffer with 0.05M EDTA as titrant. Calculate the amount of Mg in ppm if the titre is 5ml of EDTA (3mks) ii) Calculate the pH of a 1000-mL buffer solution containing 0.200M NH4OH and 0.300M NH4CI. (3mks)

How does the presence of seed in a fruit affect the vitamin c content? That is how would removing seeds from a fruit affect the vitamin c content.

A balloon containing helium gas has a volume of 38.8 L at a temperature of 25° C inside a house. If the balloon is moved outside, where the temperature is only -15° C, what would be the volume in L of the balloon?