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nirvana33 [79]
3 years ago
13

What is meaning of trash​

Chemistry
2 answers:
denis23 [38]3 years ago
8 0

Answer:

Garbage, something that someone threw away.

salantis [7]3 years ago
7 0

Answer:

waste or discarded material

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Promethium-147 is sometimes used in luminescent paint. It has a half-life of 956.3 days. If 250 grams (g) of promethium-147 is u
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Answer:

% = 76.75%

Explanation:

To solve this problem, we just need to use the expressions of half life and it's relation with the concentration or mass of a compound. That expression is the following:

A = A₀ e^(-kt)   (1)

Where:

A and A₀: concentrations or mass of the compounds, (final and initial)

k: constant decay of the compound

t: given time

Now to get the value of k, we should use the following expression:

k = ln2 / t₁/₂   (2)

You should note that this expression is valid when the reaction is of order 1 or first order. In this kind of exercises, we can assume it's a first order because we are not using the isotope for a reaction.

Now, let's calculate k:

k = ln2 / 956.3

k = 7.25x10⁻⁴ d⁻¹

With this value, we just replace it in (1) to get the final mass of the isotope. The given time is 1 year or 365 days so:

A = 250 e^(-7.25x10⁻⁴ * 365)

A = 250 e^(-0.7675)

A = 191.87 g

However, the question is the percentage left after 1 year so:

% = (191.87 / 250) * 100

<h2>% = 76.75%</h2><h2>And this is the % of isotope after 1 year</h2>
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Reaction of phenol with 1,2-epoxypropane in aqueous sodium hydroxide at 150°C gives a single product, C9H12O2. in 90% yield. Sug
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Answer: 2-Benzyloxyethanol is produced reaction in the fig. below.

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Iron is used to make steel for building bridges. Some bridges have blocks of magnesium attached to them. Explain why?
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Blocks of magnesium is used to prevent iron corrosion.
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As players SLOW DOWN, their kinetic energy will:
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C) Many colors  looks to be correct.
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