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poizon [28]
3 years ago
10

Scientists have measured and recorded the average rainfall of an area over several years to see if there is a pattern. Which kin

d of investigation does this best describe? A. controlled experiment B. systematic observation C. field study D. simulation
Chemistry
1 answer:
tia_tia [17]3 years ago
8 0
The correct answer is d
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Answer:

B

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Not sure, but that one makes the most since

4 0
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A mixture of hydrogen (2.02 g) and chlorine (35.90 g) in a container at 300 K has a total gas pressure of 748 mm Hg. What is the
Llana [10]

The partial atmospheric pressure (atm) of hydrogen in the mixture is 0.59 atm.

<h3>How do we calculate the partial pressure of gas?</h3>

Partial pressure of particular gas will be calculated as:

p = nP, where

  • P = total pressure = 748 mmHg
  • n is the mole fraction which can be calculated as:
  • n = moles of gas / total moles of gas

Moles will be calculated as:

  • n = W/M, where
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  • M = molar mass

Moles of Hydrogen gas = 2.02g / 2.014g/mol = 1 mole

Moles of Chlorine gas = 35.90g / 70.9g/mol = 0.5 mole

Mole fraction of hydrogen = 1 / (1+0.5) = 0.6

Partial pressure of hydrogen = (0.6)(748) = 448.8 mmHg = 0.59 atm

Hence, required partial atmospheric pressure of hydrogen is 0.59 atm.

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2 years ago
Which of the following experiments would best test viscosity?
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An extremely soluble salt is added to water, and all of it dissolves. Is it at equilibrium? Explain.
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Once the substance stops dissolving, the system is at equlibrium with the water and the undissolved salt now, if it is in the process of dissolving because it is completely soluble but has not been able to completely dissolve, it is not at equilibrium
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The chemical formula for table sugar is c12h22o11. what can you tell from this formula
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