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taurus [48]
3 years ago
10

Which galaxy does not have a distinctive shape? A. a clustered galaxy B. an elliptical galaxy C. a barred-spiral galaxy D. an ir

regular galaxy
Chemistry
2 answers:
Aloiza [94]3 years ago
7 0
The answer is d. an irregular galaxy
Charra [1.4K]3 years ago
7 0
The answer is D
Hope this Helps:D
Have a great rest of a brainly day!
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If 27.3% of a sample of silver-112 decays in 1.52 hours, what is the half-life (in hours to 3 decimal places)?
ICE Princess25 [194]

<u>Answer:</u> The half life of the sample of silver-112 is 3.303 hours.

<u>Explanation:</u>

All radioactive decay processes undergoes first order reaction.

To calculate the rate constant for first order reaction, we use the integrated rate law equation for first order, which is:

k=\frac{2.303}{t}\log \frac{[A_o]}{[A]}

where,

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[A] = Concentration of reactant left after time 't' = [100 - 27.3] = 72.7 g

Putting values in above equation, we get:

k=\frac{2.303}{1.52hrs}\log \frac{100}{72.7}\\\\k= 0.2098hr^{-1}

To calculate the half life period of first order reaction, we use the equation:

t_{1/2}=\frac{0.693}{k}

where,

t_{1/2} = half life period of first order reaction = ?

k = rate constant = 0.2098hr^{-1}

Putting values in above equation, we get:

t_{1/2}=\frac{0.693}{0.2098hr^{-1}}\\\\t_{1/2}=3.303hrs

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Contact [7]

Answer:

The answer to your question is below

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Factors that affect the rate of a chemical reaction

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- Particle size         The lower the particle size the higher the rate of reaction.

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- Pressure                The reaction will move where there are fewer molecules.

3 0
3 years ago
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