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3 years ago

Antoine Henri Becquerel discovered radioactivity when he was studying

Chemistry

2 answers:

Katen [24]3 years ago

5 0

Antoine Henri Becquerel discovered radioactivity when he was studying

X- rays.

He had been studying phosphorescent uranium ores and hypothesized that they might absorb sunlight and reemit it as X-rays.

His hypothesis was wrong, but his experiments led to the discovery of <em>natural radioactivity</em>.

Gemiola [76]3 years ago

3 0

X-Rays is the answer

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Assertion (A): Naphthalene balls disappear with time without leaving any solid.

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Explanation:

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3 years ago

How many grams of ethanol (density 0.80 g/cm 3) should be added to 5.0 g of chloroform (density 1.5 g/cm 3) if the resulting mix

kaheart [24]

Answer:

9.2 grams of ethanol should be added.

Explanation:

Let the mass of ethanol be x

Density of an ethanol = $d_1=0.80 g/cm^3$

Volume of the ethanol = $V_1=\frac{x}{0.80 g/cm^3}$

Mass of chloroform = 5.0 g

Density of an chloroform= $d_2=1.5 g/cm^3$

Volume of the ethanol = $V_2=\frac{5.0 g}{1.5 g/cm^3}=\frac{1}{3}$

Mass of the mixture,m = x + 5.0 g

Density of the mixture = $d=1.2 g/cm^3$

Volume of the mixture= $V=\frac{m}{1.2 g/cm^3}=\frac{x+5.0 g}{1.2 g/cm^3}$

$V=V_1+V_2$

$\frac{x+5.0 g}{1.2 g/cm^3}=V_1+\frac{1}{3}$

$\frac{x+5.0 g}{1.2 g/cm^3}=\frac{x}{0.80 g/cm^3}+\frac{1}{3}$

Solving for x , we get

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3 years ago

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Answer:

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Answer:

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