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3 years ago

7 Coal was produced in the earth over millions of years. Which of the following is NOT a step in

Chemistry

1 answer:

svp [43]3 years ago

7 0

Answer:

D. Time and pressure changes dead plant material to peat.

Explanation:

There are four steps in the production of coal: peat, lignite, bituminous and anthracite.

Peat: in this stage dead plants are oxidized to water and carbon dioxide and buried under sediments. The partial decomposition of plant matter due to the absence of oxygen is called peat. There is no factor of time and pressure that changes dead plant material to peat.

Lignite: Peat is subjected to heat, pressure, and time to form lignite.

Bituminous: More pressure in lignite removes all the traces of plant matter and form “soft coal”, bituminous coal.

Anthracite: It is the last stage, in which hard coal forms with the combined pressure and high temperature.

Hence, the correct answer is "D. Time and pressure changes dead plant material to peat."

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Answer:

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Explanation:

Step 1: Data given

500.0 mL of 0.10 M Ca^2+ is mixed with 500.0 mL of 0.10 M SO4^2−

Ksp for CaSO4 is 2.40*10^−5

Step 2: Calculate moles of Ca^2+

Moles of Ca^2+ = Molarity Ca^2+ * volume

Moles of Ca^2+ = 0.10 * 0.500 L

Moles Ca^2+ = 0.05 moles

Step 3: Calculate moles of SO4^2-

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Moles SO4^2- = 0.05 moles

Step 4: Calculate total volume

500.0 mL + 500.0 mL = 1000 mL = 1L

Step 5: Calculate Q

Q = [Ca2+] [SO42-]

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Qsp = (0.050)(0.050 )=0.0025 >> Ksp

This means precipitation will occur

Step 6: Calculate molar solubility

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2.40 * 10^-5 = x²

x = √(2.40 * 10^-5)

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Step 7: Calculate total CaSO4 dissolved

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Initial mass of CaSO4 = 0.050 * 136.14 g/mol

Initial mass of CaSO4 = 6.807 grams

Step 9: Calculate mass precipitate

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The mass of calcium sulfate that will precipitate is 6.14 grams

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