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4 years ago

6

How does the reaction of hydrogen and oxygen to produce energy in a fuel cell differ from their interaction during the direct co

mbustion of hydrogen and oxygen?

1 answer:

Nikolay [14]4 years ago

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What do voltage-gated ion channels open in response to?.

Pavlova-9 [17]

Answer:Voltage-gated channels open (activate) in response to changes in membrane potential because the electric field acts on the channel to change its protein conformation (or state). It is voltage-gated sodium (Na+) channels that initiate action potentials and voltage-gated K+ channels that cause them to end.

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3 years ago

A student tests a solid sample of a compound and determines that it does not conduct electric

Vitek1552 [10]

Answer:

A

Explanation:

because they are non polar so would not conduct electricity :)

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3 years ago

Eyes, nose, mouth would each be an example of a(n)

Masja [62]

Answer:

I think it is Organ

Explanation:

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3 years ago

Calculate the vapor pressure of spherical water droplets of radius (a) 17 nm and (b) 2.0 μm surrounded by water vapor at 298 K.

Montano1993 [528]

Explanation:

Relation between pressure of water and its droplet is as follows.

$ln (\frac{p}{p_{o}}) = \frac{2 \gamma M}{r \rho RT}$

where, p = pressure of droplet

$p_{o}$ = water pressure in given temperature

$\gamma$ = $7.99 \times 10^{-3}$

M = Molecular Weight in Kg/Mol (0.018 for water)

r = radius in meters

$\rho$ = density of water in $Kg/m^{3}$ (1000 $kg/m^{3}$ )

R = ideal gas constant (8.31)

T = temperature in Kelvin

(a) We will calculate the value of p as follows.

p = $e^{\frac{2 \gamma M}{r \rho RT}} \times p_{o}$

= $e^{\frac{2 \times 0.07199 \times 0.018}{1.7 \times 10^{-8} \times 1000 \times 8.31 \times 298 K} \times 25.2$

= 26.8 torr

(b) And, vapor pressure of spherical water droplets of radius 2.0 $\mu m$ or $2 \times 10^{-6} m$

p = $e^{\frac{2 \gamma M}{r \rho RT}} \times p_{o}$

= $e^{\frac{2 \times 0.07199 \times 0.018}{2 \times 10^{-6} \times 1000 \times 8.31 \times 298 K} \times 25.2$

= 25.2 torr

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4 years ago

If I have 0.75 moles of gas at a temperature of 105 K and a pressure of 3.75 atmospheres, what is the volume of the gas

gladu [14]

Answer:

the volume is 20 just subtract

Explanation:

8 0

3 years ago