Hello,

1 answer:

5 0

I believe the correct answers from the choices listed above are the first two options. The molecules O2- and F2+ are expected to have one unpaired electron. This can be determined by looking at the value of the charge. Hope this answers the question.

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Lridium-192 is an isotope of iridium and has a half-life of 73.83 days. if a laboratory experiment begins with 100 grams of irid

fiasKO [112]

Radioactive material undergoes first order dissociation kinetics.

For 1st order system,
k = 0.693 / t1/2
where, t 1/2 = half-life of the radioactive disintegration process.

Given that, t 1/2 = 73.83 days
Therefore, k = 0.009386 day-1

Also, for 1st order reaction,
k = $\frac{2.303}{t} log \frac{Co}{Ct}$

Given that, Co = initial concentration of Iridium-192 = 100 g

Therefore, 0.009386 = $\frac{2.303}{t} log \frac{100}{Ct}$

On rearranging we get, Ct = 100 $(0.990656)^{t}$

Answer: Ct = 100 $(0.990656)^{t}$ equation approximates the amount of Iridium-192 present after t days

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3 years ago

Why do people who do a lot of physical work need more carbohydrate?

MaRussiya [10]

Answer:

A person doing physical work needs lots of good carbohydrates to keep their energy levels up and proteins to repair a muscle that might get wear and tear from overexertion. Carbohydrate will help the person work for more extended periods.

6 0

3 years ago

Which will cause the value of the equilibrium constant to change?

LUCKY_DIMON [66]

According to the Le-chatelier principle,

the equilibrium constant of an system is affected by following three factors:

1.Concentration of reacting substance

2.Temperature to carryout the reaction

3.Pressure provided during the reaction

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4 years ago

Chlorine (cl) has an atomic number of 17. it often forms an ion by gaining 1 electron. what would its charge be?

Aliun [14]

Answer:

= -1

Explanation:

Chlorine belongs to the halogen group in the periodic table. It has an atomic number of 17, which indicates the number of protons and electrons in a neutral atom of chlorine is 17.
Therefore; with an atomic number of 17, its electronic configuration will be 2:8:7.
Thus; to attain a stable configuration chlorine requires to gain one electron, by so doing it becomes a negatively charged ion with a charge of -1.

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3 years ago

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How does changing the volume of water effect solubility?

Kaylis [27]

Answer:

this is because solubility of a salt depends on the amount of salt dissolved per unit volume, hence more amount of solute can be dissolved

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3 years ago

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