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3 years ago

Compare and contrast physical layers and compositional layers.

Chemistry

1 answer:

Yuki888 [10]3 years ago

7 0

Answer:

Compositional Layers

The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties. The outermost solid layer of a rocky planet or natural satellite.

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Name the following ionic compounds: (a) Na2SO4, (b)Cu(NO3)2 (c) Fe2(CO3)3

Sindrei [870]

Answer and Explanation:

(a) $Na_2So_4$ : its chemical name is sodium sulfate in which sodium is present as $Na_2^+$ and sulfate is present as $So_4^{2-}$

(b) $Cu(NO_3)_2$ : Its chemical name is copper nitrate which is a inorganic compound which is mostly crystalline in nature

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4 years ago

-HELP-<br>How many molecules are contained in 125 grams of oxygen gas (O2)?

strojnjashka [21]

Answer:

62.50

Explanation:

I divided the 125 in the result is 62.50 but it is considered a 62.

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3 years ago

What is the definition of chemistry

Andrei [34K]

<h2>Definition:</h2>

Chemistry is the study of matter, it's properties, how and why substances combine or separate to form other substances, and how substances interact with energy. Chemistry is one of the physical sciences that help us to describe our world.

<h2>sentence examples:</h2>

•chemistry is a little hard.

•chemistry is fun to do!

<h2>synonyms:</h2>

•system

•organizing

•structure

•plan

•standard

•assembly

•design

•formation

•pattern

•method

•construction

<h2>antonyms:</h2>

•imbalance

•disproportion

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<h2>Origin:</h2>

Chemistry comes from Arabic word al-Kimia which means the art of transformation. Chemistry began as the study of alchemy.

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3 years ago

The normal boiling point of ethanol (C2H5OH) is 78.3 oC and its molar enthalpy of vaporization is 38.56 kJ/mol. What is the chan

Sloan [31]

Answer:

The change in entropy in the system is -231.5 J/K

Explanation:

Step 1: Data given

The normal boiling point of ethanol (C2H5OH) is 78.3 °C = 351.45 K

The molar enthalpy of vaporization of ethanol is 38.56 kJ/mol = 38560 J/mol

Mass of ethanol = 97.2 grams

Pressure = 1 atm

Step 2: Calculate the entropy change of vaporization

The entropy change of vaporization = molar enthalpy of vaporization of ethanol / temperature

The entropy change of vaporization = 38560 J/mol / 351.45 K

The entropy change of vaporization = -109.72 J/k*mol

Step 3: Calculate moles of ethanol

Moles ethanol = mass / molar mass ethanol

Moles ethanol = 97.2 grams / 46.07 g/mol

Moles ethanol = 2.11 moles

Step 4: Calculate change in entropy

For 1 mol = -109.72 J/K*mol

For 2.11 moles = -231.5 J/K

The change in entropy in the system is -231.5 J/K

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3 years ago

Unit 2: solution, acids, and bases answers please?!

ollegr [7]

I don't understand . Sorry :(

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3 years ago