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Maurinko [17]
2 years ago
10

In a chemical change

Chemistry
1 answer:
Vsevolod [243]2 years ago
8 0

Answer:

B. materials change their properties.

Explanation:

In a chemical change, materials often change their properties because a re-arrangement of atoms takes place.

A chemical change is one in which new kind of matter is formed.

It is always accompanied by energy changes.

  • Chemical changes are not reversible.
  • They lead to the production of new kinds of matter
  • It involves mass changes
  • Requires considerable amount of energy
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Find the amount in kJ of heat exchanged by the combustion of 61.9 g of ethane (C2H6(8) given that the molar enthalpy of combusti
elena-14-01-66 [18.8K]

Answer:

2994 kJ

Explanation:

When one mol of ethane (C₂H₆) is combusted, 1451 kJ of heat is exchanged.

First we convert 61.9 g of C₂H₆ into moles, using its molar mass:

  • 61.9 g ÷ 30 g/mol = 2.06 mol C₂H₆

Finally we <u>calculate how much heat is exchanged by the combustion of 2.06 moles of C₂H₆</u>:

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3 years ago
Describe why the periodic table needed to be reordered in 1913.
Norma-Jean [14]

Answer:

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Which one of the following does not describe an acid​
Irina-Kira [14]

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The  concentration of [H3O+] will be 6.3 x 10^{-14} M

<h3>pH</h3>

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With a pH of 13.2:

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More on pH can be found here: brainly.com/question/491373

#SPJ1

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1 year ago
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