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3 years ago

7

chemical weathering_______ A.is caused by freezing B.breaks apart rocks by physical process C.occurs when chemical reactions dis

solve or change the minerals in rocks D.none above

1 answer:

FinnZ [79.3K]3 years ago

8 0

I believe that the answer is C.

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Analyze: What do the elements in each column of the periodic table have in common?

ludmilkaskok [199]

Answer:

Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.

Explanation:

Each column is called a group. The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements.

7 0

3 years ago

The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol. How much energy is produced by burning 0.8210 g

bazaltina [42]

The energy produced by burning : -32.92 kJ

<h3>Further explanation</h3>

Delta H reaction (ΔH) is the amount of heat change between the system and its environment

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)

The enthalpy and heat(energy) can be formulated :

$\tt \Delta H=\dfrac{Q}{n}\rightarrow n=mol$

The enthalpy of combustion of naphthalene (MW = 128.17 g/mol) is -5139.6 kJ/mol.

The energy released for 0.8210 g of naphthalene :

$\tt Q=\Delta H\times n\\\\Q=-5139.6~kJ/mol\times \dfrac{0.8210~g}{128.17~g/mol}~\\\\Q=-32.92~kJ$

3 0

2 years ago

0.0075 mole of calcium trioxocarbonate(IV) is

KatRina [158]

Answer:

0.0075÷0.015=0.5 not so sure lol

4 0

3 years ago

PLEASE I NEED HELP ASAP

Murljashka [212]

Answer:

Because the density of water is one

4 0

3 years ago

Please help due today

Olegator [25]

1,1,2 & single replacement reaction

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3 years ago