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lutik1710 [3]
2 years ago
8

A covalent bond forms a(n) ______________.

Chemistry
2 answers:
icang [17]2 years ago
8 0

Answer:

Covalent bond forms a molecule.

Thank you.

BY GERALD GREAT.

DiKsa [7]2 years ago
3 0
The answer is Molecule. After a pair of shared electrons orbit around the nuclei of both atoms
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What is significant about 42?​
maks197457 [2]

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It’s twice as much as 9+10

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5 0
3 years ago
A solution contains 0.140 mol KCl in 2.100 L water. What is the concentration of KCl in g/L?
viva [34]
<h3><u>Answer</u>;</h3>

≈ 4.95 g/L

<h3><u>Explanation;</u></h3>

The molar mass of KCl = 74.5 g/mole

Therefore; 0.140 moles will be equivalent to ;

 = 0.140 moles × 74.5 g/mole

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4 0
3 years ago
I NEED HELP ASAP PLEASE
scZoUnD [109]
I think it’d be C. I’m not 100% if it is tho
8 0
3 years ago
Which statement about AHf is true?
Pachacha [2.7K]

Answer:

  • <u><em>It is positive when the bonds of the product store more energy than those of the reactants.</em></u>

Explanation:

The <em>standard enthalpy of formation</em>, <em>ΔHf</em>, is defined as the energy required to form 1 mole of a substance from its contituent elements under standard conditions of pressure and temperature.

Then, per defintion, when the elements are already at their standard states, there is not energy involved to form them from that very state; this is, the standard enthalpy of formation of the elements in their standard states is zero.

It is not zero for the compounds in its standard state, because energy should be released or absorbed to form the compounds from their consituent elements. Thus, the first choice is false.

When the bonds of the products store more energy than the those of the reactants, the difference is:

  • ΔHf =  ΔHf products - ΔHf reactants > 0, meaning that ΔHf is positive. Hence, the second statement is true.

Third is false because forming the compounds may require to use (absorb) or release (produce) energy, which means that ΔHf could be positive or negative.

Fourth statement is false, because the standard state of many elements is not liquid. For example, it is required to supply energy to iron to make it liquid. Thus, the enthalpy of formation of iron in liquid state is not zero.

3 0
3 years ago
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