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3 years ago

An atom of uranium-238 undergoes radioactive decay to form an atom of thorium-234. Which type of nuclear decay has occurred?

Chemistry

1 answer:

WINSTONCH [101]3 years ago

5 0

Answer:-

Alpha decay

Explanation:-

Uranium 238 has atomic number 92 and mass number 238.

Thorium 234 has atomic number 90 and mass number 234.

So, the change in atomic number as uranium 238 disintegrates into thorium234 = 92 – 90 = 2

So, the change in mass number as uranium 238 disintegrates into thorium234= 238 – 234 = 4

We know that when an alpha particle is emitted, the mass number decreases by 4 and the atomic number decreases by 2.

So when an atom of uranium 238 undergoes radioactive decay to form an atom of thorium-234, alpha decay has occurred.

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A. density
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How is an atomic mass unit defined?

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3 years ago

1.8 mol HCl and 3.3 mol NaOH react accord- ing to the equation HCl + NaOH −→ NaCl + H2O . Calculate the amount in moles of NaCl

ollegr [7]

Answer:

1.8 moles of NaCl must be produced.

Explanation:

Based on the reaction:

HCl + NaOH → NaCl + H2O

1 mol of HCl reacts with 1 mol of NaOH to produce 1mol of NaCl

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1.8 moles of HCl will need 1.8 moles of NaOH for a complete reaction (Ratio of reaction 1:1). As there are 3.3 moles of NaOH,

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When the 1.8 moles of HCl react completely,

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3 years ago

What is the process called to prepare a ceramic by heating a slurry of a powder of an inorganic substance in water to a very hig

Zolol [24]

Answer: The process that is used to prepare ceramic is sintering.

Explanation:

Sintering is defined as the process in which number of particles are fused together to form one solid mass by the applying pressure at high temperatures.

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When this mixture (slurry of the powders) is heated at a very high temperature and under high pressure, ceramic is formed.

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3 years ago

"Alkenes" ________.are reasonably soluble in water are relatively polar compounds have lower boiling points than alcohols of sim

aleksandr82 [10.1K]

Answer:

The answer to your question is: the third option is correct.

Explanation:

"Alkenes" ________.

are reasonably soluble in water This option is incorrect, alkenes are insoluble in water.

are relatively polar compounds This option is wrong, alkenes are not polar molecules.

have lower boiling points than alcohols of similar molecular weight This option is true, alkenes have a lower boiling point than alcohols.

both have lower boiling points than alcohols of similar molecular weight and are relatively polar compounds. This option is incorrect because is combining true with false facts.

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3 years ago