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fomenos
3 years ago
8

An object in space is made of gas and gives off light and heat energy. We can only see it at night. Which object is it? (2 point

s)
Earth
moon
star
sun
Chemistry
1 answer:
strojnjashka [21]3 years ago
7 0

Answer:

stars

earth isn't made of gas. (and you can always see it)

moon us not gas, or give off heat

sun is only visible during the day

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Answer:

1.99 x 10⁻¹⁸J

Explanation:

Given parameters:

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Unknown:

Energy of the photon  = ?

Solution:

To solve this problem, we use the expression below;

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Where E is the energy, h is the Planck's constant and f is the frequency

Now insert the parameters and solve for E;

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A weather system moving through the American Midwest produced rain with an average pH of 5.02. By the time the system reached Ne
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Answer:

The rain falling in New England is 2.29 times more acidic than the one in the American Midwest.

Explanation:

The acidity of a solution depends on the concentration of H⁺ ions ([H⁺]). We can calculate this concentration from the pH using the following expression.

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New England

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The rain falling in New England is 2.29 times more acidic than the one in the American Midwest.

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