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2 years ago

When an atom loses a valence electron, it becomes a(n) _____________ ion.

Chemistry

1 answer:

Viktor [21]2 years ago

8 0

Answer:

A) Positive

Explanation:

Let's start with a term, atom. An atom is an important piece of matter that consists of three subatomic particles: protons, neutrons and electrons. An atom is neutral because because the number of protons equals the number of electrons. So what would happen if you gained or lost an electron. That atom would turn into an ion since it now has a charge. So if an atom loses an electron, there are more protons than electrons making it a positive ion. Similarly, if an atom gains an electron, then the electrons outnumber the protons, making it a negative ion. In this case, since the atom loses a valence electron, we end up with a positive ion.

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How many moles of KCl will be<br> produced from 15.0 g of KClO3?

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Answer:

0.12 mol KCl

Explanation:

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x g KCl = 0.12 mol KCl

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Answer:

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Answer:

12.78 kJ

Explanation:

The correct balanced reaction would be

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Enthalpy change for the number of moles is given by

$\dfrac{\text{Number of moles of methanol in the reaction}}{\text{Enthalpy change in the reaction}}=\dfrac{\text{Number of moles in 3.24 g of methanol}}{\text{Enthaply in change in the mass of methanol}}$

$\\\Rightarrow\dfrac{2}{252.8}=\dfrac{0.10112}{\Delta H}\\\Rightarrow \Delta H=\dfrac{0.10112\times 252.8}{2}\\\Rightarrow \Delta H=12.781568\approx 12.78\ \text{kJ}$

The change in enthalpy is 12.78 kJ.

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Total heat = 40.8 kJ / mol ( 1.50 mol ) = 61.2 kJ of heat is to be absorbed

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Time = 61.2 kJ ( 1000 J / 1 kJ ) / 19.0 J/s = 3221.05 s

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