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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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Combustion of 1.000 g of an organic compound known to contain only carbon, hydrogen, and oxygen produces 2.360 g of carbon dioxi

mr_godi [17]

Answer:

The empirical formula is C3H4O

Explanation:

Step 1: Data given

Mass of the compound = 1.000 grams

The compound contains:

- Carbon

- hydrogen

- oxygen

The combustion of this compound gives:

2.360 grams of CO2

0.640 grams of H2O

Step 2: Calculate moles CO2

Moles CO2 = mass CO2 / molar mass CO2

Moles CO2 = 2.360 grams / 44.01 g/mol

Moles CO2 = 0.05362 moles

In CO2 we have 1 mol

This means for 1 mol CO2 we have 1 mol C

For 0.05362 moles CO2 we have 0.05362 moles C

We have 0.05362 moles of C in the compound

Step 3: Calculate mass of C

Mass C = moles C * molar mass C

Mass C = 0.05362 moles * 12.0 g/mol

Mass C = 0.643 grams

Step 4: Calculate moles of H2O

Moles H2O = 0.640 grams / 18.02 g/mol

Moles H2O = 0.0355 moles H2O

For 1 mol H2O we have 2 moles of H

For 0.0355 moles H2O we have 2*0.0355 = 0.071 moles H

Step 5: Calculate mass of H

Mass H = moles H * molar mass H

Mass H = 0.071 moles * 1.01 g/mol

Mass H = 0.072 grams

Step 6: Calculate mass of O

Mass of O = Mass of compound - mass of C - mass of H

Mass of O = 1.000 g - 0.643 - 0.072 = 0.285 grams

Step 7: Calculate moles of O

Moles O = 0.285 grams / 16.0 g/mol

Moles O = 0.0178 moles

Step 8: Calculate mol ratio

We divide by the smallest amount of moles

C: 0.05362 / 0.0178 = 3

H: 0.071 / 0.0178 = 4

O: 0.0178/0.0178 = 1

The empirical formula is C3H4O

6 0

4 years ago

Omar wrote a hypothesis about batteries called dry cells.

Flura [38]

Below are the choices:

The independent variable is the number of dry cells, and the dependent variable is the length of time the bulb works.
The independent variable is the length of time the bulb works, and the dependent variable is the number of dry cells.
The independent variable is the number of dry cells, and the dependent variable is the amount of energy available.
The independent variable is the amount of energy available, and the dependent variable is the number of dry cells.

I think the answer is The independent variable is the number of dry cells, and the dependent variable is the amount of energy available.

6 0

4 years ago

Read 2 more answers

What is the number of neutrons is one atom of carbon?

antoniya [11.8K]

Carbon atoms have 6 neutrons.

I hope this helped you out!! Happy thanksgiving!

5 0

3 years ago

Read 2 more answers

Nick made orange juice by mixing orange juice concentrate with water. Nick's friend said that the orange juice tasted very dilut

Alenkasestr [34]

If the orange juice tasted very diluted that means that there was too much water and not enough orange juice. This being said the answer would be There is a very small amount of juice concentrate compared to water.

3 0

4 years ago

Read 2 more answers

How many grams are in 4.50 moles of Li2O?

astraxan [27]

Answer:

There are 134.5 grams in 4.5 moles of Li2O (lithium oxide).

Explanation:

8 0

3 years ago