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Sveta_85 [38]
3 years ago
8

When patterns of stars appear to move across the sky, it provides evidence that ________.

Chemistry
1 answer:
Alexus [3.1K]3 years ago
6 0

Answer:

Answered B

Explanation:

The earth moves which makes the stars and everything in space seem like its moving

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PLEASE HELP ME
ki77a [65]

Answer:

1.15 atm

Explanation:

According to Dalton's law of partial pressures, the total pressure is the sum of all the partial pressures of the gases present in the mixture.

Therefore we have:

Total pressure = partial pressure of carbon monoxide + partial pressure of oxygen + partial pressure of carbon dioxide

We were given the following:

Total pressure = 2.45 atm

Pressure of oxygen = 0.65 atm

Pressure of carbon monoxide = x

Pressure of carbon dioxide = 0.65 atm

Therefore:

2.45 = x + 0.65 + 0.65

2.45 = x + 1.3

x = 2.45 - 1.3

x = 1.15 atm

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Explain whether this is a chemical or physical change, and why. does it involve elements, compounds, mixtures, or pure substances?

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Is this correct? also for the mass i have to round it to the closest whole number
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