3 years ago

Why do chemical reactions involve a change in energy

1 answer:

8 0

Why do chemical reactions always involve a change in energy?

The energy change in a chemical reaction is due to the difference in the amounts of stored chemical energy between the products and the reactants. This stored chemical energy, or heat content, of the system is known as its enthalpy.

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Radio waves transmitted through space at 3.00 ✕ 108 m/s by the Voyager spacecraft have a wavelength of 0.137 m. What is their fr

fredd [130]

Answer:

Frequency, $f=2.18\times 10^9\ Hz$

Explanation:

We have,

Speed of radio waves is $3\times 10^8\ m/s$

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It is required to find the frequency of the radio waves. The speed of a wave is given by :

$v=f\lambda\\\\f=\dfrac{v}{\lambda}\\\\f=\dfrac{3\times 10^8}{0.137}\\\\f=2.18\times 10^9\ Hz$

So, the frequency of the radio wave is $2.18\times 10^9\ Hz$ .

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3 years ago

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The correct answer is C. Final Velocity

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3 years ago

Four satellites are in orbit around the Earth. The heights and the masses of

Kaylis [27]

Answer:

satellite B

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D .F= G (4mM)/(2r)² = G (mM)/r²

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3 years ago

In a building with 10.000 cubic feet where the air changes every two hours, what the rate of air change? A. 167.7 cfm B. 83.3 cf

Naya [18.7K]

Answer:

Flow rate of air is given as 83.33 cubic feet per minute

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3 years ago

Please help! I haven't really been able to understand this topic :/

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Ok but y I thought it was upside down tho...

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3 years ago

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Why do chemical reactions involve a change in energy​

Why do chemical reactions involve a change in energy