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2 years ago

Convection is the up and down movement of what?

Chemistry

1 answer:

Fynjy0 [20]2 years ago

3 0

Convection is the up and down movement of heat. Usually air, but convection also occurs in the ocean.

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Write the full Nernst Equation (i.e. not just at 298K) and define each term:

alex41 [277]

Answer :

The Nernst equation :

$E_{cell}=E^o_{cell}-\frac{2.303RT}{nF}\log \frac{[Anode]}{[Cathode]}$

where,

$E^0$ = standard cell potential

n = number of electrons in oxidation-reduction reaction

F = Faraday constant = 96500 C

R= gas constant = 8.314 J/Kmol

T = temperature

[Anode] = anodic ion concentration

[Cathode] = cathodic ion concentration

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3 years ago

We can change a gas to liquid by_________ the temperature and_________

Tpy6a [65]

Decreasing, Removing

6 0

2 years ago

I am the life cycle that contains tiny undeveloped plants,

LuckyWell [14K]

The water cycle regardless if it is in a lake, our bodies, food, or underground.

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2 years ago

An inventor claims to have devised a closed cyclic engine which exchanges heat with cold and hot reservoirs at 25 and 350 ◦C, re

kati45 [8]

Explanation:

The given data is as follows.

$T_{c} = 25^{o}C$ , $T_{h} = 350^{o}C$

Work produced per kJ of heat extracted from hot reservoir = 0.45 kJ = Efficiency

If the device is Carnot cycle then its efficiency will be maximum and its value will be equal to $[1 - (\frac{T_{c}}{T_{h}} )]$

Using this relation we will calculate the efficiency as follows.

Efficiency = $[1 - (\frac{T_{c}}{T_{h}} )]$

= $1 - (\frac{25}{350})$

= 0.928

Hence, it means that this type of device is possible and the claim is also believable.

7 0

2 years ago

You discover a bottle of aqueous sodium chloride of unknown molarity. However, the bottle says that there are 0.75 moles of NaCl

lara31 [8.8K]

To calculate the molarity you only need to know the number of moles in the solution and the volume of that solution. This exercise gives both and with that you divide moles by volume(usually in liters).

500 ml equals 0,5 L
molarity= number of moles/ volume
molarity=0,75 x 0,5
= 0,375 mol/L

6 0

2 years ago