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3 years ago

Write a balanced nuclear equation for the following: The nuclide astatine-218 undergoes alpha emission to give bismuth-214

Chemistry

1 answer:

galina1969 [7]3 years ago

7 0

Answer:

$^{218}_{85}At\rightarrow ^{214}_{83}Bi+^{4}_{2}He$

Explanation:

Hello there!

In this case, since the radioactive reaction for the alpha emission of astatine-218 to bismith-214 involve the release of a helium atom as shown below:

$^{218}_{85}At\rightarrow ^{214}_{83}Bi+^{4}_{2}He$

Whereas the atomic number decreases by 2 and the mass number by 4 in agreement to the release of the Helium atom.

Regards!

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Lisa [10]

Answer:

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3 years ago

Bob is investigating whether the density of water changes with temperature. Which of the following variables should he change in

LekaFEV [45]

Answer:

temperature of the water

Explanation:

Density is defied as mass divided by the volume. To investigate how the density of water change with temperature, Bob have the change the temperature and read the volume and mass of the investigated sample.

Even if there is a different salt content between booted water or tap water and have an influence on the density (compared with pure water), this difference is not so big so the change in density with temperature can be determined. Considering that the experiment do not require extreme accuracy, any type of water may be used (bottled water of tap water).

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4 years ago

A sheet of aluminum foil has a total area of 1.000 m2 and a mass of 3.636 g. What is the thickness of the sheet in millimeters?

olga2289 [7]

Answer:

$t=1.34\times 10^{-3}\ mm$

Explanation:

Given that,

Area of sheet of Aluminium foil is 1 m²

Mass of the sheet = 3.636 g

The density of Aluminium, $d=2.699\ g/cm^3$

We need to find the thickness of the sheet in millimeters.

The density of an object is given in terms of its mass and volume as follows :

$d=\dfrac{m}{V}$

V = volume, V = A×t, t = thickness of the sheet

So,

$d=\dfrac{m}{A\times t}\\\\t=\dfrac{m}{Ad}\\\\t=\dfrac{3.636\ g}{10000\ cm^2\times 2.699\ g/cm^3}\\\\t=0.000134\ cm$

Since, 1 cm = 10 mm

So,

t = 0.00134 mm

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3 years ago

If pressure is kept constant and the temperature of a gas is doubled, what will happen

weqwewe [10]

I believe it's (A). It will double.

Explanation:

Charles law states that the volume of an ideal gas is directly proportional to the absolute temperature at constant pressure. (Charles's law).

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3 years ago

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Xelga [282]

If you're referring to plants, your answer is the Epidermis.

Hope this helps! :)

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3 years ago