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3 years ago

Explain how index minerals allow a scientist to understand the history of a metamorphic rock?

2 answers:

5 0

It allows a scientist to understand the history of metamorphic rock by estimating the temperature, depth, and pressure at which a rock undergoes metamorphism. Hope that helped!

Vladimir [108]3 years ago

5 0

Answer:

Index minerals are defined as those minerals that signifies how much the original or source rock has undergone metamorphism. It indicates the grade of metamorphism. These index minerals are formed under very high pressure and temperature condition that is commonly found to be present in the metamorphic rocks.

Some of the examples of index minerals are kyanite, sillimanite, garnet, chlorite, staurolite, and epidote.

Thus, the index minerals determine the grade of metamorphism.

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The boiling point of water is 100.0°C at 1 atmosphere. How many grams of sodium acetate (82.04 g/mol), must be dissolved in 283.

Alecsey [184]

Answer:

I have to weight 10,04 g of acetate sodium

Explanation:

This is the colligative propertie about elevation of boiling point

ΔT = Kb . m . i

ΔT is the difference between T° at boiling point of the solution - T° at boiling point of the solvent pure - we have this data 0,450°C

Kb means ebulloscopic constant (0,52 °C.kg/m .- a known value for water)

m means molality (moles of solute in 1kg of solvent)

i means theVan 't Hoff factor (degree of dissociation for a compound)

For the sodium acetate is 2

NaCH3COO ---> Na+ + CH3COO-

0,450°C = 0,52°C.kg/m . m . 2

0,450°C / (0,52°C.kg/m . 2) = m

0,432 m/kg = m

This number means I have 0,432 moles of acetate sodium, my solute in 1kg of water, my solvent. But I don't have 1000 g (1kg) I only have 283 g so let's make the rule of three:

1000 g _____ 0,432 moles

283 g ______ (283g .0,432m) / 1000g = 0,122 moles

Now that I have the moles of acetate sodium, I have to find the mass.

Moles . molar mass = mass

0,122 moles . 82.04 g/mol = 10,04 g

3 0

4 years ago

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Bezzdna [24]

Nonmetals and negative. Answer is c

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3 years ago

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Natalka [10]

Answer:

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4 years ago

How toxic is uranium

Serhud [2]

Answer:

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3 years ago

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Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an el

givi [52]

Answer: The amount of time needed to plate 14.0 kg of copper onto the cathode is 295 hours

Explanation:

We are given:

Moles of electron = 1 mole

According to mole concept:

1 mole of an atom contains $6.022\times 10^{23}$ number of particles.