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3 years ago

What happens in a voltaic cell?

Chemistry

1 answer:

nirvana33 [79]3 years ago

3 0

Answer:

Hi ,

Answer:

A chemical energy is changed to a electrical energy

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A gaseous substance turns into a solid. Which best describes this change? A substance that has a specific shape changes to a sub

Snezhnost [94]

A substance that has no specific volume changes to a substance that has a specific volume.

8 0

3 years ago

Read 2 more answers

Whats the name?!?!?!??!?!?!?!?!?!?!!?!?!?!??!?!?!?!

SIZIF [17.4K]

Hydrogen i suppose is the right one

7 0

2 years ago

A sample of metal has a mass of 18.20g, and a volume of 7.38mL. What is the density in g/cm^3?

AlexFokin [52]

Density = Mass ÷ Volume. You get 2.466

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3 years ago

5. A beam of photons with a minimum energy of 222 kJ/mol can eject electrons from a potassium surface. Estimate the range of wav

torisob [31]

Answer: The range of wavelengths of light that can be used to cause given phenomenon is $8.953 \times 10^{21} m$ .

Explanation:

Given: 222 kJ/mol (1 kJ = 1000 J) = 222000 J

Formula used is as follows.

$E = \frac{hc}{\lambda}$

where,

E = energy

h = Planck's constant = $6.625 \times 10^{-25} Js$

c = speed of light = $3 \times 10^{8} m/s$

Substitute the values into above formula as follows.

$E = \frac{hc}{\lambda}\\222000 J = \frac{6.625 \times 10^{-34}Js \times 3 \times 10^{8} m/s}{\lambda}\\\lambda = 8.953 \times 10^{21} m$

Thus, we can conclude that the range of wavelengths of light that can be used to cause given phenomenon is $8.953 \times 10^{21} m$ .

7 0

3 years ago

For each of the following cases, identify the order with respect to the reactant, A. Case (A ----> product)

damaskus [11]

Answer:

The answers to the question are

1. 2nd and above order order

2. 2nd order

3. 1/2 order

4. 1st order

5. 0 order

Explanation:

We have $\frac{N}{N_{0} } = e^{-\lambda t}$

1. For nth order reaction half life $t_{\frac{1}{2} }$ ∝ $\frac{1}{[A_{0} ]^{n-1} }$

Therefore for a 0 order reaction increasing concentration of the reactant there will increase $t_{\frac{1}{2} }$

First order reaction is independent [A₀].

Second order reaction [A₀] decrease, increase.

Similarly for a third order reaction

1. 2nd order

2. 2nd order reaction

3. Order of reaction is 1/2.

4. 1st order reaction.

5. Zero order reaction.

5 0

3 years ago